diff --git a/client/client.go b/client/client.go
index facdbd8..53d5437 100644
--- a/client/client.go
+++ b/client/client.go
@@ -32,7 +32,7 @@
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"os"
@@ -84,7 +84,7 @@
 
 func (ls *localSource) GetByModule(_ context.Context, module string) (_ []*osv.Entry, err error) {
 	defer derrors.Wrap(&err, "GetByModule(%q)", module)
-	content, err := ioutil.ReadFile(filepath.Join(ls.dir, module+".json"))
+	content, err := os.ReadFile(filepath.Join(ls.dir, module+".json"))
 	if os.IsNotExist(err) {
 		return nil, nil
 	} else if err != nil {
@@ -99,7 +99,7 @@
 
 func (ls *localSource) GetByID(_ context.Context, id string) (_ *osv.Entry, err error) {
 	defer derrors.Wrap(&err, "GetByID(%q)", id)
-	content, err := ioutil.ReadFile(filepath.Join(ls.dir, internal.IDDirectory, id+".json"))
+	content, err := os.ReadFile(filepath.Join(ls.dir, internal.IDDirectory, id+".json"))
 	if os.IsNotExist(err) {
 		return nil, nil
 	} else if err != nil {
@@ -114,7 +114,7 @@
 
 func (ls *localSource) ListIDs(context.Context) (_ []string, err error) {
 	defer derrors.Wrap(&err, "ListIDs()")
-	content, err := ioutil.ReadFile(filepath.Join(ls.dir, internal.IDDirectory, "index.json"))
+	content, err := os.ReadFile(filepath.Join(ls.dir, internal.IDDirectory, "index.json"))
 	if err != nil {
 		return nil, err
 	}
@@ -139,7 +139,7 @@
 func (ls *localSource) Index(context.Context) (_ DBIndex, err error) {
 	defer derrors.Wrap(&err, "Index()")
 	var index DBIndex
-	b, err := ioutil.ReadFile(filepath.Join(ls.dir, "index.json"))
+	b, err := os.ReadFile(filepath.Join(ls.dir, "index.json"))
 	if err != nil {
 		return nil, err
 	}
@@ -202,7 +202,7 @@
 	if resp.StatusCode != http.StatusOK {
 		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
 	}
-	b, err := ioutil.ReadAll(resp.Body)
+	b, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return nil, err
 	}
@@ -337,7 +337,7 @@
 		return nil, nil
 	}
 	// might want this to be a LimitedReader
-	return ioutil.ReadAll(resp.Body)
+	return io.ReadAll(resp.Body)
 }
 
 type client struct {
diff --git a/client/client_test.go b/client/client_test.go
index e7bc1d1..46958da 100644
--- a/client/client_test.go
+++ b/client/client_test.go
@@ -9,7 +9,6 @@
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -116,7 +115,7 @@
 	if err := os.MkdirAll(dir, 0755); err != nil {
 		return err
 	}
-	return ioutil.WriteFile(path.Join(dir, file), []byte(content), 0644)
+	return os.WriteFile(path.Join(dir, file), []byte(content), 0644)
 }
 
 // localDB creates a local db with testVulns and index as contents.
diff --git a/cmd/govulncheck/integration/k8s/k8s.go b/cmd/govulncheck/integration/k8s/k8s.go
index d844c62..f72028a 100644
--- a/cmd/govulncheck/integration/k8s/k8s.go
+++ b/cmd/govulncheck/integration/k8s/k8s.go
@@ -6,7 +6,6 @@
 
 import (
 	"encoding/json"
-	"io/ioutil"
 	"log"
 	"os"
 
@@ -25,7 +24,7 @@
 	}
 	out := os.Args[1]
 
-	outJson, err := ioutil.ReadFile(out)
+	outJson, err := os.ReadFile(out)
 	if err != nil {
 		log.Fatal("Failed to read:", out)
 	}
diff --git a/cmd/govulncheck/internal/govulncheck/cache.go b/cmd/govulncheck/internal/govulncheck/cache.go
index 0948837..a995504 100644
--- a/cmd/govulncheck/internal/govulncheck/cache.go
+++ b/cmd/govulncheck/internal/govulncheck/cache.go
@@ -8,7 +8,6 @@
 import (
 	"encoding/json"
 	"go/build"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"sync"
@@ -63,7 +62,7 @@
 	c.mu.Lock()
 	defer c.mu.Unlock()
 
-	b, err := ioutil.ReadFile(filepath.Join(c.rootDir, dbName, "index.json"))
+	b, err := os.ReadFile(filepath.Join(c.rootDir, dbName, "index.json"))
 	if err != nil {
 		if os.IsNotExist(err) {
 			return nil, time.Time{}, nil
@@ -92,7 +91,7 @@
 	if err != nil {
 		return err
 	}
-	if err := ioutil.WriteFile(filepath.Join(path, "index.json"), j, 0666); err != nil {
+	if err := os.WriteFile(filepath.Join(path, "index.json"), j, 0666); err != nil {
 		return err
 	}
 	return nil
@@ -102,7 +101,7 @@
 	c.mu.Lock()
 	defer c.mu.Unlock()
 
-	b, err := ioutil.ReadFile(filepath.Join(c.rootDir, dbName, p, "vulns.json"))
+	b, err := os.ReadFile(filepath.Join(c.rootDir, dbName, p, "vulns.json"))
 	if err != nil {
 		if os.IsNotExist(err) {
 			return nil, nil
@@ -128,7 +127,7 @@
 	if err != nil {
 		return err
 	}
-	if err := ioutil.WriteFile(filepath.Join(path, "vulns.json"), j, 0666); err != nil {
+	if err := os.WriteFile(filepath.Join(path, "vulns.json"), j, 0666); err != nil {
 		return err
 	}
 	return nil