diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 48cb8ea..1da1788 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -13,11 +13,11 @@ jobs:
         os: [ ubuntu-latest, macos-latest, windows-latest ]
     steps:
 
-    - uses: actions/setup-go@v2
-      with:
-        go-version: 1.x
+    - uses: actions/checkout@v4
 
-    - uses: actions/checkout@v2
+    - uses: actions/setup-go@v4
+      with:
+        go-version: '>=1.20.8'
 
     - run: go test
 
diff --git a/go.mod b/go.mod
index 69b94c2..073c4fa 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,5 @@
 module github.com/koron-go/gqlcost
 
-go 1.18
+go 1.20
 
-require github.com/graphql-go/graphql v0.8.0
+require github.com/graphql-go/graphql v0.8.1
diff --git a/go.sum b/go.sum
index a02c8ea..5f20647 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-github.com/graphql-go/graphql v0.8.0 h1:JHRQMeQjofwqVvGwYnr8JnPTY0AxgVy1HpHSGPLdH0I=
-github.com/graphql-go/graphql v0.8.0/go.mod h1:nKiHzRM0qopJEwCITUuIsxk9PlVlwIiiI8pnJEhordQ=
+github.com/graphql-go/graphql v0.8.1 h1:p7/Ou/WpmulocJeEx7wjQy611rtXGQaAcXGqanuMMgc=
+github.com/graphql-go/graphql v0.8.1/go.mod h1:nKiHzRM0qopJEwCITUuIsxk9PlVlwIiiI8pnJEhordQ=