diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..b600bec
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,93 @@
+name: build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: ${{ matrix.os }} ${{ matrix.version }}
+    runs-on: ${{ matrix.os }}
+    
+    if: "!contains(github.event.head_commit.message, 'SKIP CI')"
+    timeout-minutes: 20
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        version: ['stable']
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v1
+
+      - name: Setup Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: '10.x'
+
+      - name: Setup Go
+        uses: actions/setup-go@v1
+        with:
+         go-version: '1.14'
+
+      - name: Install dependencies
+        run: npm install
+      
+      - name: Compile
+        run: npm run vscode:prepublish
+
+      - name: Install Go tools (Modules mode)
+        run: |
+            go version
+            go get github.com/acroca/go-symbols \
+               github.com/davidrjenni/reftools/cmd/fillstruct \
+               github.com/haya14busa/goplay/cmd/goplay \
+               github.com/mdempsky/gocode \
+               github.com/sqs/goreturns \
+               github.com/uudashr/gopkgs/v2/cmd/gopkgs \
+               github.com/zmb3/gogetdoc \
+               golang.org/x/lint/golint \
+               golang.org/x/tools/cmd/gorename
+        env:
+          GO111MODULE: on   
+          
+      - name: Install Go tools (GOPATH mode)
+        run: |
+          go version
+          go get github.com/cweill/gotests/... \
+            github.com/rogpeppe/godef \
+            github.com/ramya-rao-a/go-outline
+            # Because some tests depend on the source code checked in GOPATH. TODO: FIX THEM.
+        env:
+          GO111MODULE: off
+      
+      - name: Run unit tests
+        run: npm run unit-test
+        continue-on-error: true
+        
+      - name: Run tests
+        uses: GabrielBB/xvfb-action@v1.0
+        with:
+          run: npm run test
+        env:
+          CODE_VERSION: ${{ matrix.version }}
+        continue-on-error: ${{ matrix.version == 'insiders' }}
+
+  eslint:
+    runs-on: ubuntu-latest
+    if: "!contains(github.event.head_commit.message, 'SKIP CI')"
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v1
+
+      - name: Setup Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: '10.x'
+
+      - name: Install Dependencies
+        run: 'npm install --frozen-lockfile'
+        shell: bash
+
+      - name: Lint check
+        run: npm run lint
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..eff44f1
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,84 @@
+name: release
+
+# Daily release on 15:00 UTC, monday-thursday.
+# Or, force to release by triggering repository_dispatch events by using
+#   curl -v -H "Accept: application/vnd.github.everest-preview+json" -H "Authorization: token ${GITHUB_TOKEN}" https://api.github.com/repos/golang/vscode-go/dispatches -d '{ "event_type": "force-release" }'
+on:
+  schedule:
+    - cron: "0 15 * * MON-THU"  # 15 UTC, monday-thursday daily
+  repository_dispatch:
+    types: [force-release]
+
+env:
+  GOPATH: /tmp/go
+  # Because some tests require explicit setting of GOPATH. TODO: FIX THEM.
+
+jobs:
+  release:
+    name: Release Nightly
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v1
+
+      - name: Setup Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: '10.x'
+
+      - name: Setup Go
+        uses: actions/setup-go@v1
+        with:
+         go-version: '1.14'
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Install Go tools (Modules mode)
+        run: |
+            go version
+            go get github.com/acroca/go-symbols \
+               github.com/davidrjenni/reftools/cmd/fillstruct \
+               github.com/haya14busa/goplay/cmd/goplay \
+               github.com/mdempsky/gocode \
+               github.com/sqs/goreturns \
+               github.com/uudashr/gopkgs/v2/cmd/gopkgs \
+               github.com/zmb3/gogetdoc \
+               golang.org/x/lint/golint \
+               golang.org/x/tools/cmd/gorename
+        env:
+          GO111MODULE: on
+
+      - name: Install Go tools (GOPATH mode)
+        run: |
+          go version
+          go get github.com/cweill/gotests/... \
+            github.com/rogpeppe/godef \
+            github.com/ramya-rao-a/go-outline
+            # Because some tests depend on the source code checked in GOPATH. TODO: FIX THEM.
+        env:
+          GO111MODULE: off
+
+      - name: Prepare Release
+        run: build/all.bash prepare_nightly
+
+      - name: Run unit tests
+        run: npm run unit-test
+        continue-on-error: true
+
+      - name: Run tests
+        uses: GabrielBB/xvfb-action@v1.0
+        with:
+          run: npm run test
+        env:
+          CODE_VERSION: 'insiders'
+
+      - name: Publish
+        if: github.ref == 'refs/heads/master' && github.repository == 'golang/vscode-go'
+        uses: lannonbr/vsce-action@704da577da0f27de5cdb4ae018374c2f08b5f523
+        with:
+          args: "publish -p $VSCE_TOKEN"
+        env:
+          VSCE_TOKEN: ${{ secrets.VSCE_TOKEN }}
diff --git a/CHANGELOG.md.nightly b/CHANGELOG.md.nightly
new file mode 100644
index 0000000..f93a946
--- /dev/null
+++ b/CHANGELOG.md.nightly
@@ -0,0 +1,4 @@
+## 2020.3.x
+* Set the extension name for VS Code Go Nightly(`go-nightly`).
+* Pick up the pre-release version of `gopls` if available.
+* Disabled the telemetry report for VS Code Go.
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..71e3b94
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,16 @@
+name: "vscode-go"
+description:
+    "Fork of github.com/Microsoft/vscode-go (the VSCode plugin for Go). "
+    "This fork is kept in sync with the upstream while includes "
+    "new features go-tools@google.com team is developing and experimenting. "
+    ""
+
+third_party {
+  url {
+    type: GIT
+    value: "https://github.com/Microsoft/vscode-go"
+  }
+  version: "master"
+  last_upgrade_date { year: 2020 month: 1 day: 8 }
+  license_type: NOTICE
+}
diff --git a/README.md b/README.md
index e7adc9d..d5f4900 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,30 @@
-# Go for Visual Studio Code
+# Go Nightly for VS Code
 
-[![Join the chat at https://gitter.im/Microsoft/vscode-go](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/Microsoft/vscode-go?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Build Status](https://travis-ci.org/Microsoft/vscode-go.svg?branch=master)](https://travis-ci.org/Microsoft/vscode-go)
+> ### **ATTENTION**
+>**Go Nightly for VS Code** is the insider version of
+[VS Code Go extension](https://github.com/microsoft/vscode-go)
+for early feedback and testing. This extension works best with
+[VS Code Insiders](https://code.visualstudio.com/insiders).
+Go Nightly contains previews of new features and bug fixes that are still
+under review or testing, so can be unstable. If you are looking for the stable version,
+please use [the stable version](https://marketplace.visualstudio.com/items?itemName=ms-vscode.go) instead.
+>
+> **NOTE:**
+If you have both stable (aka "Go") and nightly version (aka "Go Nightly") installed,
+you MUST DISABLE one of them. Docs on how to disable an extension can be found
+[here](https://code.visualstudio.com/docs/editor/extension-gallery#_disable-an-extension).
 
-This extension adds rich language support for the [Go language](https://golang.org/) to VS Code.
-
-Read the [Changelog](https://github.com/Microsoft/vscode-go/blob/master/CHANGELOG.md) to know what has changed over the last few versions of this extension.
+> ### Difference between VS Code Go and VS Code Go Nightly
+> - Go Nightly is maintained and released by Go Tools team at Google.
+> - Go Nightly is released more frequently than the stable version.
+> - Go Nightly includes features and bug fixes that are still under testing or not finalized yet.
+> - Go Nightly may use the latest pre-release versions of tools (e.g. `gopls`) instead of release versions.
+> - For now, Go and Go Nightly maintain separate repositories. Both repositories
+>   welcome all contributors. For contribution to Go Nightly repo, see the Go
+>   project's [contribution guide](https://golang.org/doc/contribute.html).
+>   Go team members who has signed the Microsoft CLA will send a syncing PR upstream to
+>   https://github.com/microsoft/vscode-go every two weeks.
+> - [Here](https://github.com/microsoft/vscode-go/compare/master...golang:master) is the full list of local modifications.
 
 ## Table of Contents
 
diff --git a/build/README.md b/build/README.md
new file mode 100644
index 0000000..cacccb2
--- /dev/null
+++ b/build/README.md
@@ -0,0 +1,88 @@
+## Continuous Integration Testing
+
+Currently we are using two separate CI systems to test all changes and pushed commits:
+Tests running in Google Cloud Build (GCB) and tests running with GitHub Action.
+It is a temporary setup; once GCB fully supports our desired workflow that works
+with the Go Git repository, we plan to use the GCB-based setup for CI.
+
+### Testing via GCB
+
+This workflow is triggered for Gerrit CLs (chosen by project members) and all
+the commits merged into the master branch.
+Note that our main repository is in `go.googlesource.com/vscode-go` and
+`github.com/golang/vscode-go` is a mirror of the Go Git repository.
+All PRs sent to `github.com/golang/vscode-go` will be converted as Gerrit CLs.
+Currently, the results of the CI Run are visible to only project members.
+We are working on improving this workflow - making the results visible to
+public and easily accessible through our Gerrit review UI.
+
+- `build/cloudbuild.yaml`, `build/all.bash` - define the GCB workflow.
+- `build/cloudbuild.container.yaml`, `build/Dockerfile` - define the Docker container used for CI.
+
+Project members (currently restricted to our GCP project members) can manually
+trigger cloud build and test their locally made changes. 
+Follow the [GCB instruction](https://cloud.google.com/cloud-build/docs/running-builds/start-build-manually)
+to set up the environment and tools, and then run
+
+```
+$ gcloud builds submit --config=build/cloudbuild.yaml
+```
+
+In order to modify and rebuild the docker container image, run
+
+```
+$ gcloud builds submit --config=build/cloudbuild.container.yaml
+```
+
+### Testing via GitHub Action
+
+This is the workflow triggered for every PR and commit made to our mirror repository in github.com/golang/vscode-go. We are using this CI to run tests
+in the platforms which GCB does not support yet, and allow contributors 
+to see the test results for their PRs. This workflow is not triggered by
+CLs sent via Gerrit yet.
+
+Until GCB-based CI is ready for general use, we recommend contributors
+to send PRs to github.com/golang/vscode-go as described in
+[the Go project contribution guide](https://golang.org/doc/contribute.html#sending_a_change_github). The results will be posted to the PR request.
+
+- `.github/workflows/ci.yml` - define the github action based CI workflow.
+
+## Nightly Release
+
+A new version is released based on what is committed on the `master` branch,
+at least once a day between Monday and Thursday. If there is no new commit,
+release does not happen. This nightly extension is a separate extension from
+the official Go extension, and is available at [the VS Code market place](https://marketplace.visualstudio.com/items?itemName=golang.go-nightly).
+
+The version number encodes the last commit timestamp of the master branch
+in the format of `YYYY.[M]M.[D]DHH`. For example, version 2020.3.702 indicates
+the extension is built with the last commit committed at ~2AM 2020/03/07 (UTC).
+
+- `.github/workflows/release.yml, build/all.bash` - define the daily release process.
+
+## Sync with upstream
+
+### Merging commits from upstream
+
+This is done manually by project members, probably before each nightly release.
+
+Once we consolidate the two repositories, this process becomes unnecessary.
+
+The merge script will create a Gerrit CL for merge and issue the GCB based test workflow. 
+The remote `origin` should be set to `https://go.googlesource.com/vscode-go`.
+Make sure you have access to the GCB project and `gcloud` tool 
+is available.
+
+```
+$ build/merge.sh
+```
+
+In case of conflicts, you will need to check out the cl, fix, and upload the
+updated cl again following the usual Gerrit CL workflow.
+
+### Reflecting commits to upstream
+
+Once the feature or bug fix tested with Nightly extension is stablized, create
+a PR to the upstream (github.com/microsoft/vscode-go).
+Please make sure to include all the gerrit CL numbers so the upstream code
+reviewers can find reference to all prior discussion.
diff --git a/build/all.bash b/build/all.bash
index 1a8e4a8..6dd46bf 100755
--- a/build/all.bash
+++ b/build/all.bash
@@ -51,6 +51,32 @@
   docker run --workdir=/workspace -v "$(pwd):/workspace" vscode-test-env ci
 }
 
+prepare_nightly() {
+  # Version format: YYYY.MM.DDHH based on the latest commit timestamp.
+  # e.g. 2020.1.510 is the version built based on a commit that was made
+  #      on 2020/01/05 10:00
+  local VER=`git log -1 --format=%cd --date="format:%Y.%-m.%-d%H"`
+  local COMMIT=`git log -1 --format=%H`
+  echo "**** Preparing nightly release : $VER ***"
+
+  # Update package.json
+  (cat package.json | jq --arg VER "${VER}" '
+.version=$VER |
+.preview=true |
+.name="go-nightly" |
+.displayName="Go Nightly" |
+.publisher="golang" |
+.description="Rich Go language support for Visual Studio Code (Nightly)" |
+.author.name="Go Team at Google" |
+.repository.url="https://github.com/golang/vscode-go" |
+.bugs.url="https://github.com/golang/vscode-go/issues"
+') > /tmp/package.json && mv /tmp/package.json package.json
+
+  # Replace CHANGELOG.md with CHANGELOG.md.nightly + Release commit info.
+  # TODO(hyangah): Update README.md
+  printf "**Release ${VER} @ ${COMMIT}** \n\n" | cat - CHANGELOG.md.nightly > /tmp/CHANGELOG.md.new && mv /tmp/CHANGELOG.md.new CHANGELOG.md
+}
+
 main() {
   cd "$(root_dir)"  # always run from the script root.
   case "$1" in
@@ -70,9 +96,12 @@
       setup_virtual_display
       run_test
       ;;
+    "prepare_nightly")
+      prepare_nightly
+      ;;
     *)
       usage
       exit 2
   esac
 }
-main $@
\ No newline at end of file
+main $@
diff --git a/build/cloudbuild.container.yaml b/build/cloudbuild.container.yaml
new file mode 100644
index 0000000..12d8ad7
--- /dev/null
+++ b/build/cloudbuild.container.yaml
@@ -0,0 +1,5 @@
+steps:
+- name: 'gcr.io/cloud-builders/docker'
+  args: ['build', '-t', 'gcr.io/$PROJECT_ID/vscode-test-env', '-f', 'build/Dockerfile', '.']
+images:
+    - 'gcr.io/$PROJECT_ID/vscode-test-env'
diff --git a/build/cloudbuild.yaml b/build/cloudbuild.yaml
new file mode 100644
index 0000000..a678121
--- /dev/null
+++ b/build/cloudbuild.yaml
@@ -0,0 +1,9 @@
+steps:
+- name: 'gcr.io/$PROJECT_ID/vscode-test-env'
+  entrypoint: "./build/all.bash"
+  args: ['ci']
+  env:
+    - 'BUILD=$BUILD_ID'
+    - 'PROJECT=$PROJECT_ID'
+    - 'REV=$REVISION_ID'
+timeout: 600s
diff --git a/build/merge.bash b/build/merge.bash
new file mode 100755
index 0000000..971f10a
--- /dev/null
+++ b/build/merge.bash
@@ -0,0 +1,34 @@
+#! /bin/bash
+set -euo pipefail
+
+# In order to sync with upstream, run merge.bash
+
+# TODO(hyangah): commands for building docker container and running tests locally with docker run.
+root_dir() {
+  local script_name=$(readlink -f "${0}")
+  local script_dir=$(dirname "${script_name}")
+  local parent_dir=$(dirname "${script_dir}")
+  echo "${parent_dir}"
+}
+
+ROOT="$(root_dir)"
+cd "${ROOT}"  # always run from the root directory.
+
+WORKTREE="$(mktemp -d)"
+BRANCH="sync/merge-upstream-$(date +%Y%m%d%H%M%S)"
+
+git fetch
+git worktree add --track -b "${BRANCH}" "${WORKTREE}" origin/master
+
+cd "${WORKTREE}"
+export GIT_GOFMT_HOOK=off
+git merge --no-commit "origin/upstream" || echo "Ignoring conflict..."
+
+COMMIT=`git log --format=%h -n 1 "origin/upstream"`
+
+gcloud builds submit --config=build/cloudbuild.yaml || echo "Build failed. Please address the issue..."
+
+git commit -m "sync: merge microsoft/vscode-go@${COMMIT} into master"
+
+git codereview mail HEAD
+cd - && git worktree remove "${WORKTREE}"
diff --git a/package-lock.json b/package-lock.json
index fd74a28..1750715 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
-  "name": "Go",
-  "version": "0.14.1",
+  "name": "go-nightly",
+  "version": "0.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -108,27 +108,39 @@
       "dev": true
     },
     "@types/mocha": {
-      "version": "5.2.7",
-      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-5.2.7.tgz",
-      "integrity": "sha512-NYrtPht0wGzhwe9+/idPaBB+TqkY9AhTvOLMkThm0IoEfLaiVQZwBwyJ5puCkO3AUCWrmcoePjp2mbFocKy4SQ==",
+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-7.0.2.tgz",
+      "integrity": "sha512-ZvO2tAcjmMi8V/5Z3JsyofMe3hasRcaw88cto5etSVMwVQfeivGAlEYmaQgceUSVYFofVjT+ioHsATjdWcFt1w==",
       "dev": true
     },
     "@types/node": {
-      "version": "12.12.35",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.12.35.tgz",
-      "integrity": "sha512-ASYsaKecA7TUsDrqIGPNk3JeEox0z/0XR/WsJJ8BIX/9+SkMSImQXKWfU/yBrSyc7ZSE/NPqLu36Nur0miCFfQ==",
+      "version": "13.11.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-13.11.1.tgz",
+      "integrity": "sha512-eWQGP3qtxwL8FGneRrC5DwrJLGN4/dH1clNTuLfN81HCrxVtxRjygDTUoZJ5ASlDEeo0ppYFQjQIlXhtXpOn6g==",
       "dev": true
     },
     "@types/semver": {
-      "version": "6.2.1",
-      "resolved": "https://registry.npmjs.org/@types/semver/-/semver-6.2.1.tgz",
-      "integrity": "sha512-+beqKQOh9PYxuHvijhVl+tIHvT6tuwOrE9m14zd+MT2A38KoKZhh7pYJ0SNleLtwDsiIxHDsIk9bv01oOxvSvA==",
-      "dev": true
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/@types/semver/-/semver-7.1.0.tgz",
+      "integrity": "sha512-pOKLaubrAEMUItGNpgwl0HMFPrSAFic8oSVIvfu1UwcgGNmNyK9gyhBHKmBnUTwwVvpZfkzUC0GaMgnL6P86uA==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
     },
     "@types/sinon": {
-      "version": "7.5.2",
-      "resolved": "https://registry.npmjs.org/@types/sinon/-/sinon-7.5.2.tgz",
-      "integrity": "sha512-T+m89VdXj/eidZyejvmoP9jivXgBDdkOSBVQjU9kF349NEx10QdPNGxHeZUaj1IlJ32/ewdyXJjnJxyxJroYwg==",
+      "version": "9.0.0",
+      "resolved": "https://registry.npmjs.org/@types/sinon/-/sinon-9.0.0.tgz",
+      "integrity": "sha512-v2TkYHkts4VXshMkcmot/H+ERZ2SevKa10saGaJPGCJ8vh3lKrC4u663zYEeRZxep+VbG6YRDtQ6gVqw9dYzPA==",
+      "dev": true,
+      "requires": {
+        "@types/sinonjs__fake-timers": "*"
+      }
+    },
+    "@types/sinonjs__fake-timers": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/@types/sinonjs__fake-timers/-/sinonjs__fake-timers-6.0.1.tgz",
+      "integrity": "sha512-yYezQwGWty8ziyYLdZjwxyMb0CZR49h8JALHGrxjQHWlqGgc8kLdHEgWrgL0uZ29DMvEVBDnHU2Wg36zKSIUtA==",
       "dev": true
     },
     "@types/vscode": {
@@ -178,6 +190,16 @@
         "color-convert": "^1.9.0"
       }
     },
+    "anymatch": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.1.tgz",
+      "integrity": "sha512-mM8522psRCqzV+6LhomX5wgp25YVibjh8Wj23I5RPkPppSVSjyKD2A2mBJmWGa+KN7f2D6LNh9jkBCeyLktzjg==",
+      "dev": true,
+      "requires": {
+        "normalize-path": "^3.0.0",
+        "picomatch": "^2.0.4"
+      }
+    },
     "applicationinsights": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/applicationinsights/-/applicationinsights-1.4.0.tgz",
@@ -240,6 +262,12 @@
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
       "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k="
     },
+    "at-least-node": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/at-least-node/-/at-least-node-1.0.0.tgz",
+      "integrity": "sha512-+q/t7Ekv1EDY2l6Gda6LLiX14rU9TV20Wa3ofeQmwPFZbOMo9DXrLbOjFaaclkXKWidIaopwAObQDqwWtGUjqg==",
+      "dev": true
+    },
     "aws-sign2": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
@@ -269,6 +297,12 @@
       "resolved": "https://registry.npmjs.org/better-curry/-/better-curry-1.6.0.tgz",
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-        "mkdirp": "^0.5.1",
+        "mkdirp": "^0.5.3",
         "resolve": "^1.3.2",
         "semver": "^5.3.0",
-        "tslib": "^1.8.0",
+        "tslib": "^1.10.0",
         "tsutils": "^2.29.0"
       },
       "dependencies": {
@@ -1587,9 +1734,9 @@
       "dev": true
     },
     "universalify": {
-      "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
-      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-1.0.0.tgz",
+      "integrity": "sha512-rb6X1W158d7pRQBg5gkR8uPaSfiids68LTJQYOtEUhoJUWBdaQHsuT/EUduxXYxcrt4r5PJ4fuHW1MHT6p0qug==",
       "dev": true
     },
     "uri-js": {
@@ -1643,12 +1790,19 @@
       "integrity": "sha512-JvONPptw3GAQGXlVV2utDcHx0BiY34FupW/kI6mZ5x06ER5DdPG/tXWMVHjTNULF5uKPOUUD0SaXg5QaubJL0A=="
     },
     "vscode-languageclient": {
-      "version": "6.1.0",
-      "resolved": "https://registry.npmjs.org/vscode-languageclient/-/vscode-languageclient-6.1.0.tgz",
-      "integrity": "sha512-Tcp0VoOaa0YzxL4nEfK9tsmcy76Eo8jNLvFQZwh2c8oMm02luL8uGYPLQNAiZ3XGgegfcwiQFZMqbW7DNV0vxA==",
+      "version": "6.1.3",
+      "resolved": "https://registry.npmjs.org/vscode-languageclient/-/vscode-languageclient-6.1.3.tgz",
+      "integrity": "sha512-YciJxk08iU5LmWu7j5dUt9/1OLjokKET6rME3cI4BRpiF6HZlusm2ZwPt0MYJ0lV5y43sZsQHhyon2xBg4ZJVA==",
       "requires": {
         "semver": "^6.3.0",
-        "vscode-languageserver-protocol": "^3.15.2"
+        "vscode-languageserver-protocol": "^3.15.3"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw=="
+        }
       }
     },
     "vscode-languageserver-protocol": {
diff --git a/package.json b/package.json
index 8f7f4b7..fb6541d 100644
--- a/package.json
+++ b/package.json
@@ -1,11 +1,13 @@
 {
-  "name": "Go",
-  "version": "0.14.1",
-  "publisher": "ms-vscode",
-  "description": "Rich Go language support for Visual Studio Code",
+  "name": "go-nightly",
+  "displayName": "Go Nightly",
+  "version": "0.0.0",
+  "publisher": "golang",
+  "description": "Rich Go language support for Visual Studio Code (Nightly)",
   "author": {
-    "name": "Microsoft Corporation - Development Labs"
+    "name": "Go Team at Google"
   },
+  "preview": true,
   "license": "MIT",
   "icon": "images/go-logo-blue.png",
   "categories": [
@@ -22,7 +24,10 @@
   "private": true,
   "repository": {
     "type": "git",
-    "url": "https://github.com/Microsoft/vscode-go.git"
+    "url": "https://github.com/golang/vscode-go"
+  },
+  "bugs": {
+    "url": "https://github.com/golang/vscode-go/issues"
   },
   "keywords": [
     "multi-root ready"
@@ -40,33 +45,33 @@
   },
   "extensionDependencies": [],
   "dependencies": {
-    "diff": "^4.0.1",
+    "diff": "^4.0.2",
     "json-rpc2": "^1.0.2",
     "moment": "^2.24.0",
-    "semver": "^6.3.0",
+    "semver": "^7.3.2",
     "tree-kill": "^1.2.2",
-    "vscode-debugadapter": "^1.36.0",
-    "vscode-debugprotocol": "^1.36.0",
+    "vscode-debugadapter": "^1.40.0",
+    "vscode-debugprotocol": "^1.40.0",
     "vscode-extension-telemetry": "^0.1.2",
-    "vscode-languageclient": "6.1.0",
+    "vscode-languageclient": "^6.1.3",
     "web-request": "^1.0.7"
   },
   "devDependencies": {
-    "@types/fs-extra": "^8.0.0",
+    "@types/fs-extra": "^8.1.0",
     "@types/glob": "^7.1.1",
-    "@types/mocha": "^5.2.7",
-    "@types/node": "^12.7.2",
-    "@types/semver": "^6.0.1",
-    "@types/sinon": "^7.5.2",
-    "@types/vscode": "^1.25.0",
-    "fs-extra": "^8.1.0",
-    "glob": "^7.1.4",
-    "mocha": "^6.2.0",
-    "prettier": "^1.16.4",
-    "sinon": "^9.0.1",
-    "tslint": "^5.19.0",
-    "typescript": "^3.7.2",
-    "vscode-test": "^1.2.3"
+    "@types/mocha": "^7.0.2",
+    "@types/node": "^13.11.1",
+    "@types/semver": "^7.1.0",
+    "@types/sinon": "^9.0.0",
+    "@types/vscode": "^1.44.0",
+    "fs-extra": "^9.0.0",
+    "glob": "^7.1.6",
+    "mocha": "^7.1.1",
+    "prettier": "^2.0.4",
+    "sinon": "^9.0.2",
+    "tslint": "^6.1.1",
+    "typescript": "^3.8.3",
+    "vscode-test": "^1.3.0"
   },
   "engines": {
     "vscode": "^1.41.0"
diff --git a/src/avlTree.ts b/src/avlTree.ts
index b9c146d..56ac9ce 100644
--- a/src/avlTree.ts
+++ b/src/avlTree.ts
@@ -41,7 +41,31 @@
 	 * @param key The key of the new node.
 	 * @param value The value of the new node.
 	 */
-	constructor(public key: K, public value: V) {}
+	constructor(public key: K, public value: V) { }
+
+	/**
+	 * Convenience function to get the height of the left child of the node,
+	 * returning -1 if the node is null.
+	 * @return The height of the left child, or -1 if it doesn't exist.
+	 */
+	public get leftHeight(): number {
+		if (!this.left) {
+			return -1;
+		}
+		return this.left.height;
+	}
+
+	/**
+	 * Convenience function to get the height of the right child of the node,
+	 * returning -1 if the node is null.
+	 * @return The height of the right child, or -1 if it doesn't exist.
+	 */
+	public get rightHeight(): number {
+		if (!this.right) {
+			return -1;
+		}
+		return this.right.height;
+	}
 
 	/**
 	 * Performs a right rotate on this node.
@@ -78,30 +102,6 @@
 		other.height = Math.max(other.rightHeight, this.height) + 1;
 		return other;
 	}
-
-	/**
-	 * Convenience function to get the height of the left child of the node,
-	 * returning -1 if the node is null.
-	 * @return The height of the left child, or -1 if it doesn't exist.
-	 */
-	public get leftHeight(): number {
-		if (!this.left) {
-			return -1;
-		}
-		return this.left.height;
-	}
-
-	/**
-	 * Convenience function to get the height of the right child of the node,
-	 * returning -1 if the node is null.
-	 * @return The height of the right child, or -1 if it doesn't exist.
-	 */
-	public get rightHeight(): number {
-		if (!this.right) {
-			return -1;
-		}
-		return this.right.height;
-	}
 }
 
 export type DistanceFunction<K> = (a: K, b: K) => number;
diff --git a/src/goInstallTools.ts b/src/goInstallTools.ts
index eee3841..f82bb8f 100644
--- a/src/goInstallTools.ts
+++ b/src/goInstallTools.ts
@@ -8,6 +8,7 @@
 import cp = require('child_process');
 import fs = require('fs');
 import path = require('path');
+import { SemVer } from 'semver';
 import vscode = require('vscode');
 import { getLanguageServerToolPath } from './goLanguageServer';
 import { envPath, getToolFromToolPath } from './goPath';
@@ -18,6 +19,7 @@
 	disableModulesForWildcard,
 	getConfiguredTools,
 	getImportPath,
+	getImportPathWithVersion,
 	getTool,
 	hasModSuffix,
 	isGocode,
@@ -89,11 +91,21 @@
 }
 
 /**
+ * ToolAtVersion is a Tool with version annotation.
+ * Lack of version implies the latest version
+ */
+export interface ToolAtVersion extends Tool {
+	version?: SemVer;
+}
+
+/**
  * Installs given array of missing tools. If no input is given, the all tools are installed
  *
- * @param string[] array of tool names to be installed
+ * @param missing array of tool names and optionally, their versions to be installed.
+ *                If a tool's version is not specified, it will install the latest.
+ * @param goVersion version of Go that affects how to install the tool. (e.g. modules vs legacy GOPATH mode)
  */
-export function installTools(missing: Tool[], goVersion: GoVersion): Promise<void> {
+export function installTools(missing: ToolAtVersion[], goVersion: GoVersion): Promise<void> {
 	const goRuntimePath = getBinPath('go');
 	if (!goRuntimePath) {
 		vscode.window.showErrorMessage(
@@ -169,7 +181,11 @@
 
 	outputChannel.appendLine(installingMsg);
 	missing.forEach((missingTool) => {
-		outputChannel.appendLine('  ' + missingTool.name);
+		let toolName = missingTool.name;
+		if (missingTool.version) {
+			toolName += '@' + missingTool.version;
+		}
+		outputChannel.appendLine('  ' + toolName);
 	});
 
 	outputChannel.appendLine(''); // Blank line for spacing.
@@ -178,7 +194,7 @@
 	const toolsTmpDir = fs.mkdtempSync(getTempFilePath('go-tools-'));
 
 	return missing
-		.reduce((res: Promise<string[]>, tool: Tool) => {
+		.reduce((res: Promise<string[]>, tool: ToolAtVersion) => {
 			return res.then(
 				(sofar) =>
 					new Promise<string[]>((resolve, reject) => {
@@ -199,18 +215,18 @@
 							env: envForTools,
 							cwd: toolsTmpDir
 						};
-
 						const callback = (err: Error, stdout: string, stderr: string) => {
 							// Make sure to delete the temporary go.mod file, if it exists.
 							if (tmpGoModFile && fs.existsSync(tmpGoModFile)) {
 								fs.unlinkSync(tmpGoModFile);
 							}
+							const importPath = getImportPathWithVersion(tool, tool.version, goVersion);
 							if (err) {
-								outputChannel.appendLine('Installing ' + getImportPath(tool, goVersion) + ' FAILED');
+								outputChannel.appendLine('Installing ' + importPath + ' FAILED');
 								const failureReason = tool.name + ';;' + err + stdout.toString() + stderr.toString();
 								resolve([...sofar, failureReason]);
 							} else {
-								outputChannel.appendLine('Installing ' + getImportPath(tool, goVersion) + ' SUCCEEDED');
+								outputChannel.appendLine('Installing ' + importPath + ' SUCCEEDED');
 								resolve([...sofar, null]);
 							}
 						};
@@ -246,11 +262,17 @@
 							if (hasModSuffix(tool)) {
 								args.push('-d');
 							}
-							args.push(getImportPath(tool, goVersion));
+							let importPath: string;
+							if (modulesOffForTool) {
+								importPath = getImportPath(tool, goVersion);
+							} else {
+								importPath = getImportPathWithVersion(tool, tool.version, goVersion);
+							}
+							args.push(importPath);
 							cp.execFile(goRuntimePath, args, opts, (err, stdout, stderr) => {
 								if (stderr.indexOf('unexpected directory layout:') > -1) {
 									outputChannel.appendLine(
-										`Installing ${tool.name} failed with error "unexpected directory layout". Retrying...`
+										`Installing ${importPath} failed with error "unexpected directory layout". Retrying...`
 									);
 									cp.execFile(goRuntimePath, args, opts, callback);
 								} else if (!err && hasModSuffix(tool)) {
@@ -320,7 +342,6 @@
 			return;
 		}
 	}
-
 	const installOptions = ['Install'];
 	let missing = await getMissingTools(goVersion);
 	if (!containsTool(missing, tool)) {
@@ -352,23 +373,27 @@
 	});
 }
 
-export async function promptForUpdatingTool(toolName: string) {
+export async function promptForUpdatingTool(toolName: string, newVersion?: SemVer) {
 	const tool = getTool(toolName);
+	const toolVersion = {...tool, version: newVersion}; // ToolWithVersion
 
 	// If user has declined to update, then don't prompt.
 	if (containsTool(declinedUpdates, tool)) {
 		return;
 	}
 	const goVersion = await getGoVersion();
-	const updateMsg = `Your version of ${tool.name} appears to be out of date. Please update for an improved experience.`;
+	let updateMsg = `Your version of ${tool.name} appears to be out of date. Please update for an improved experience.`;
 	const choices: string[] = ['Update'];
 	if (toolName === `gopls`) {
-		choices.push('Release Notes'); // TODO(hyangah): pass more info such as version, release note location.
+		choices.push('Release Notes');
+	}
+	if (newVersion) {
+		updateMsg = `New version of ${tool.name} (${newVersion}) is available. Please update for an improved experience.`;
 	}
 	vscode.window.showInformationMessage(updateMsg, ...choices).then((selected) => {
 		switch (selected) {
 			case 'Update':
-				installTools([tool], goVersion);
+				installTools([toolVersion], goVersion);
 				break;
 			case 'Release Notes':
 				vscode.commands.executeCommand(
diff --git a/src/goLanguageServer.ts b/src/goLanguageServer.ts
index 5be6225..5252b60 100644
--- a/src/goLanguageServer.ts
+++ b/src/goLanguageServer.ts
@@ -38,7 +38,7 @@
 import { GoWorkspaceSymbolProvider } from './goSymbol';
 import { getTool, Tool } from './goTools';
 import { GoTypeDefinitionProvider } from './goTypeDefinition';
-import { getBinPath, getCurrentGoPath, getGoConfig, getToolsEnvVars } from './util';
+import { getBinPath, getCurrentGoPath, getGoConfig, getToolsEnvVars, isForNightly } from './util';
 
 interface LanguageServerConfig {
 	enabled: boolean;
@@ -80,9 +80,10 @@
 
 	// If installed, check. The user may not have the most up-to-date version of the language server.
 	const tool = getTool(toolName);
-	const update = await shouldUpdateLanguageServer(tool, languageServerToolPath, config.checkForUpdates);
-	if (update) {
-		promptForUpdatingTool(toolName);
+	const versionToUpdate = await shouldUpdateLanguageServer(tool, languageServerToolPath, config.checkForUpdates);
+
+	if (versionToUpdate) {
+		promptForUpdatingTool(toolName, versionToUpdate);
 	}
 
 	const c = new LanguageClient(
@@ -340,33 +341,35 @@
 	tool: Tool,
 	languageServerToolPath: string,
 	makeProxyCall: boolean
-): Promise<boolean> {
+): Promise<semver.SemVer> {
 	// Only support updating gopls for now.
 	if (tool.name !== 'gopls') {
-		return false;
+		return null;
 	}
 
 	// First, run the "gopls version" command and parse its results.
-	// If "gopls" is so old that it doesn't have the "gopls version" command,
-	// or its version doesn't match our expectations, prompt the user to download.
 	const usersVersion = await goplsVersion(languageServerToolPath);
-	if (!usersVersion) {
-		return true;
-	}
 
 	// We might have a developer version. Don't make the user update.
 	if (usersVersion === '(devel)') {
-		return false;
+		return null;
 	}
 
-	// Get the latest gopls version.
-	let latestVersion = makeProxyCall ? await latestGopls(tool) : defaultLatestVersion;
+	// Get the latest gopls version. If it is for nightly, using the prereleased version is ok.
+	let latestVersion = makeProxyCall ? await latestGopls(tool, isForNightly) : defaultLatestVersion;
 
 	// If we failed to get the gopls version, pick the one we know to be latest at the time of this extension's last update
 	if (!latestVersion) {
 		latestVersion = defaultLatestVersion;
 	}
 
+	// If "gopls" is so old that it doesn't have the "gopls version" command,
+	// or its version doesn't match our expectations, usersVersion will be empty.
+	// Suggest the latestVersion.
+	if (!usersVersion) {
+		return latestVersion;
+	}
+
 	// The user may have downloaded golang.org/x/tools/gopls@master,
 	// which means that they have a pseudoversion.
 	const usersTime = parsePseudoversionTimestamp(usersVersion);
@@ -376,12 +379,12 @@
 		if (!latestTime) {
 			latestTime = defaultLatestVersionTime;
 		}
-		return usersTime.isBefore(latestTime);
+		return usersTime.isBefore(latestTime) ? latestVersion : null;
 	}
 
 	// If the user's version does not contain a timestamp,
 	// default to a semver comparison of the two versions.
-	return semver.lt(usersVersion, latestVersion);
+	return semver.lt(usersVersion, latestVersion) ? latestVersion : null;
 }
 
 // Copied from src/cmd/go/internal/modfetch.
@@ -435,7 +438,7 @@
 	return time;
 }
 
-async function latestGopls(tool: Tool): Promise<semver.SemVer> {
+async function latestGopls(tool: Tool, includePrerelease: boolean): Promise<semver.SemVer> {
 	// If the user has a version of gopls that we understand,
 	// ask the proxy for the latest version, and if the user's version is older,
 	// prompt them to update.
@@ -457,6 +460,9 @@
 	}
 	versions.sort(semver.rcompare);
 
+	if (includePrerelease) {
+		return versions[0];  // The first one in the prerelease.
+	}
 	// The first version in the sorted list without a prerelease tag.
 	return versions.find((version) => !version.prerelease || !version.prerelease.length);
 }
diff --git a/src/goMain.ts b/src/goMain.ts
index 4620a39..52701ad 100644
--- a/src/goMain.ts
+++ b/src/goMain.ts
@@ -5,7 +5,6 @@
 
 'use strict';
 
-import fs = require('fs');
 import * as path from 'path';
 import vscode = require('vscode');
 import { browsePackages } from './goBrowsePackage';
diff --git a/src/goTools.ts b/src/goTools.ts
index 9030a5b..30fccb4 100644
--- a/src/goTools.ts
+++ b/src/goTools.ts
@@ -5,6 +5,7 @@
 
 'use strict';
 
+import { SemVer } from 'semver';
 import { goLiveErrorsEnabled } from './goLiveErrors';
 import { getGoConfig, GoVersion } from './util';
 
@@ -28,6 +29,13 @@
 	return tool.importPath;
 }
 
+export function getImportPathWithVersion(tool: Tool, version: SemVer, goVersion: GoVersion): string {
+	const importPath = getImportPath(tool, goVersion);
+	if (version) {
+		return importPath + '@v' + version;
+	}
+	return importPath;
+}
 /**
  * Returns boolean denoting if the import path for the given tool ends with `/...`
  * and if the version of Go supports installing wildcard paths in module mode.
diff --git a/src/telemetry.ts b/src/telemetry.ts
index c417c44..4070b43 100644
--- a/src/telemetry.ts
+++ b/src/telemetry.ts
@@ -6,10 +6,10 @@
 import vscode = require('vscode');
 import TelemetryReporter from 'vscode-extension-telemetry';
 
-export const extensionId: string = 'ms-vscode.Go';
+export const extensionId: string = 'golang.go-nightly';
 const extension = vscode.extensions.getExtension(extensionId);
 const extensionVersion: string = extension ? extension.packageJSON.version : '';
-const aiKey: string = 'AIF-d9b70cd4-b9f9-4d70-929b-a071c400b217';
+const aiKey: string = '';  // Empty aiKey disables telemetry.
 
 export function sendTelemetryEventForModulesUsage() {
 	/* __GDPR__
diff --git a/src/util.ts b/src/util.ts
index a5525ba..295422c 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -1023,3 +1023,6 @@
 	}
 	return false;
 }
+
+// isForNightly is true if the source code is built for a preview version of the extension.
+export const isForNightly: boolean = extensionId.endsWith('.go-nightly');