diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 8758366..1bb15a2 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -18,7 +18,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v4
         with:
-          go-version: "1.20"
+          go-version: "1.21"
 
       - name: Test
         run: go test -v ./...
diff --git a/go.mod b/go.mod
index 47bbf93..ad366eb 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/ymw0407/jamo
 
-go 1.20
+go 1.21
 
 require github.com/stretchr/testify v1.9.0