diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index a7bb745..661d2ce 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -14,7 +14,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.17
+          go-version: 1.21
 
       - name: Test
         run: |
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 21e401a..8ddc686 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -20,7 +20,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.17
+          go-version: 1.21
 
       - name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v2
diff --git a/go.mod b/go.mod
index 39ae854..2e4eff9 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/etsy/terraform-demux
 
-go 1.17
+go 1.21
 
 require (
 	github.com/Masterminds/semver/v3 v3.1.1