diff --git a/.github/workflows/build-pr.yml b/.github/workflows/build-pr.yml
index e38704d8..29481444 100644
--- a/.github/workflows/build-pr.yml
+++ b/.github/workflows/build-pr.yml
@@ -14,7 +14,7 @@ jobs:
       - name: setup go environment
         uses: actions/setup-go@v1
         with:
-          go-version: '1.17.3'
+          go-version: '1.18.9'
       - name: run unit tests
         run: make test
       - name: run acceptance tests
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 69e812d1..8140560b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -13,7 +13,7 @@ jobs:
       - name: setup go environment
         uses: actions/setup-go@v1
         with:
-          go-version: '1.17.3'
+          go-version: '1.18.9'
       - name: run unit tests
         run: make test
       - name: run acceptance tests
diff --git a/go.mod b/go.mod
index 3c28126c..3c7f45f5 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module oras.land/oras-go
 
-go 1.17
+go 1.18
 
 require (
 	github.com/containerd/containerd v1.6.12