diff --git a/_content/doc/go1.21.html b/_content/doc/go1.21.html
index 3755d84..697b55c 100644
--- a/_content/doc/go1.21.html
+++ b/_content/doc/go1.21.html
@@ -14,14 +14,7 @@
   main ul li { margin: 0.5em 0; }
 </style>
 
-<h2 id="introduction">DRAFT RELEASE NOTES — Introduction to Go 1.21</h2>
-
-<p>
-  <strong>
-    Go 1.21 is not yet released. These are work-in-progress
-    release notes. Go 1.21 is expected to be released in August 2023.
-  </strong>
-</p>
+<h2 id="introduction">Introduction to Go 1.21</h2>
 
 <p>
   The latest Go release, version 1.21, arrives six months after <a href="/doc/go1.20">Go 1.20</a>.
diff --git a/cmd/golangorg/cloudbuild.yaml b/cmd/golangorg/cloudbuild.yaml
index 38ad0ce..c6edaa6 100644
--- a/cmd/golangorg/cloudbuild.yaml
+++ b/cmd/golangorg/cloudbuild.yaml
@@ -4,7 +4,7 @@
 
 steps:
   - name: gcr.io/cloud-builders/git
-    args: ["clone", "--branch=release-branch.go1.20", "--depth=1", "https://go.googlesource.com/go", "_gotmp"]
+    args: ["clone", "--branch=release-branch.go1.21", "--depth=1", "https://go.googlesource.com/go", "_gotmp"]
   - name: gcr.io/cloud-builders/git
     args: ["archive", "--format=zip", "--output=../_goroot.zip", "HEAD"]
     dir: _gotmp
diff --git a/internal/history/release.go b/internal/history/release.go
index 268be7e..e3a35ec 100644
--- a/internal/history/release.go
+++ b/internal/history/release.go
@@ -15,6 +15,9 @@
 // The table is sorted by date, breaking ties with newer versions first.
 var Releases = []*Release{
 	{
+		Date: Date{2023, 8, 8}, Version: Version{1, 21, 0},
+	},
+	{
 		Date: Date{2023, 8, 1}, Version: Version{1, 20, 7},
 		Security: &FixSummary{Quantifier: "a", Packages: []string{"crypto/tls"}},
 		Bug: &FixSummary{