diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index a288b12..a4069eb 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -19,10 +19,10 @@ jobs:
     steps:
     - name: "[preparation] checkout the current branch"
       uses: actions/checkout@v3.5.3
-    - name: "[preparation] set up golang 1.20.4"
+    - name: "[preparation] set up golang 1.21.3"
       uses: actions/setup-go@v4.0.1
       with:
-        go-version: "1.20.4"
+        go-version: "1.21.3"
         cache-dependency-path: ./go.sum
     - name: "[preparation] set up qemu"
       uses: docker/setup-qemu-action@v2