diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 6671189..928d2e0 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         os: [ "ubuntu-latest", "macos-latest", "windows-latest" ]
-        go-version: [ "1.15", "1.16", "1.17" ]
+        go-version: [ "1.16", "1.17", "1.18" ]
     runs-on: ${{ matrix.os }}
     steps:
     - name: setup Go ${{ matrix.go-version }}
@@ -42,7 +42,7 @@ jobs:
       - name: setup Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.17
+          go-version: 1.18
       - name: checkout ( feature )
         uses: actions/checkout@v2
       - name: run benchmark ( feature )
@@ -64,7 +64,7 @@ jobs:
       - name: setup Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.17
+          go-version: 1.18
       - name: checkout
         uses: actions/checkout@v2
       - name: measure coverage
diff --git a/docker-compose.yml b/docker-compose.yml
index 48415e3..db40c79 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,7 +1,7 @@
 version: '2'
 services:
   go-json:
-    image: golang:1.17
+    image: golang:1.18
     volumes:
       - '.:/go/src/go-json'
     deploy: