diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 8e861ca..300b8af 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -16,9 +16,9 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: ["1.19.x", "1.20.x"]
+        go: ["1.20.x", "1.21.x"]
         include:
-        - go: 1.20.x
+        - go: 1.21.x
           latest: true
 
     steps:
diff --git a/go.mod b/go.mod
index 2e2c86d..bcfe680 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module go.uber.org/automaxprocs
 
-go 1.18
+go 1.20
 
 require (
 	github.com/prashantv/gostub v1.1.0
diff --git a/tools/go.mod b/tools/go.mod
index 58ec51b..7f5d2c9 100644
--- a/tools/go.mod
+++ b/tools/go.mod
@@ -1,6 +1,6 @@
 module go.uber.org/automaxprocs/tools
 
-go 1.18
+go 1.20
 
 require (
 	golang.org/x/lint v0.0.0-20210508222113-6edffad5e616