diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index a0d70785..2763fdd4 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -136,7 +136,7 @@ jobs:
       - uses: "actions/setup-node@v4"
         with:
           check-latest: true
-          node-version: 20
+          node-version: 21
       - name: "Install node modules"
         run: "npm ci"
       - name: Run ESLint
@@ -149,7 +149,7 @@ jobs:
       - uses: "actions/setup-node@v4"
         with:
           check-latest: true
-          node-version: 20
+          node-version: 21
       - name: "Install node modules"
         run: "npm ci"
       - name: Run Jest
diff --git a/Dockerfile b/Dockerfile
index 7e4b0dfb..4a6f4001 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,6 +6,7 @@ COPY package*.json ./
 COPY tsconfig.json ./
 COPY webpack.config.ts ./
 RUN npm ci
+RUN apk add --no-cache jq && npx semver -r $(jq -r '.packages."".engines.node' package-lock.json) $(node -v) || >&2 echo "ERROR: package-lock.json is not synchronized with Dockerfile node version." && exit 1
 COPY ./src ./src
 RUN npm run build
 
diff --git a/package-lock.json b/package-lock.json
index 1d608698..0d91247c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -32,7 +32,7 @@
                 "webpack-cli": "^5.0.0"
             },
             "engines": {
-                "node": "^20.2.0",
+                "node": "^21.7.0",
                 "npm": "^10.0.0"
             }
         },
diff --git a/package.json b/package.json
index 70a15cd1..8a855b01 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
     },
     "engines": {
         "npm": "^10.0.0",
-        "node": "^20.2.0"
+        "node": "^21.7.0"
     },
     "dependencies": {
         "@actions/core": "^1.10.0",