diff --git a/.github/workflows/deno-ci.yaml b/.github/workflows/deno-ci.yaml
index 3a787d9..138debf 100644
--- a/.github/workflows/deno-ci.yaml
+++ b/.github/workflows/deno-ci.yaml
@@ -19,9 +19,10 @@ jobs:
     strategy:
       matrix:
         deno-version:
-        - v1.20
         - v1.25
         - v1.30
+        - v1.35
+        - v1.40
         - canary
       fail-fast: false # run each branch to completion
 
@@ -45,7 +46,7 @@ jobs:
 
     - name: Check src/main.ts
       if: always()
-      run: time deno cache src/main.ts
+      run: time deno check src/main.ts
 
     - name: Run test suite
       if: always()
@@ -63,7 +64,7 @@ jobs:
       - name: Use Deno stable
         uses: denoland/setup-deno@v1
         with:
-          deno-version: v1.30
+          deno-version: v1.40
       - name: Cache https://
         uses: actions/cache@v4
         with:
diff --git a/Dockerfile b/Dockerfile
index a8ff948..fb17182 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM denoland/deno:alpine-1.30.1
+FROM denoland/deno:alpine-1.40.0
 WORKDIR /src/kubernetes-dns-sync
 
 ADD src/deps.ts ./