diff --git a/.github/workflows/docker.yaml b/.github/workflows/docker.yaml
index 474da499..3e1c7ffa 100644
--- a/.github/workflows/docker.yaml
+++ b/.github/workflows/docker.yaml
@@ -37,7 +37,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v4
         with:
-          go-version: 1.20.7
+          go-version: 1.21.0
 
       # set up the test environment
       - uses: cybozu/octoken-action@v1
diff --git a/.github/workflows/go.yaml b/.github/workflows/go.yaml
index afeb1f86..7eed45aa 100644
--- a/.github/workflows/go.yaml
+++ b/.github/workflows/go.yaml
@@ -20,5 +20,5 @@ jobs:
   go:
     uses: int128/kubebuilder-workflows/.github/workflows/go.yaml@v1
     with:
-      go-version: 1.20.7
+      go-version: 1.21.0
       golangci-lint-version: v1.53.3