diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 864818f..cf6a664 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -29,6 +29,11 @@ jobs:
     with:
       rubocop: true
 
+  language-versions:
+    uses: ./.github/workflows/linters.yml
+    with:
+      language-versions: true
+
   specs:
     uses: ./.github/workflows/testing.yml
     strategy:
diff --git a/.github/workflows/linters.yml b/.github/workflows/linters.yml
index bae6257..ce15798 100644
--- a/.github/workflows/linters.yml
+++ b/.github/workflows/linters.yml
@@ -13,6 +13,9 @@ on:
       rubocop:
         type: boolean
         default: false
+      language-versions:
+        type: boolean
+        default: false
 
 jobs:
   linters:
@@ -45,3 +48,26 @@ jobs:
         run: |
           ${{ inputs.run-before-linters }}
           bundle exec rubocop
+
+      - name: Ensure language versions match
+        if: ${{ inputs.language-versions == true }}
+        run: |
+          NODE_VERSION=$(cat .node-version)
+          if ! grep -q "^ARG NODE_MAJOR=$NODE_VERSION" Dockerfile; then
+            echo "Dockerfile has wrong node: $(grep '^ARG NODE_MAJOR' Dockerfile)" >&2
+            exit 1
+          fi
+          if ! grep -q "^ARG NODE_MAJOR=$NODE_VERSION" Dockerfile.production; then
+            echo "Dockerfile.production has wrong node: $(grep '^ARG NODE_MAJOR' Dockerfile.production)" >&2
+            exit 1
+          fi
+
+          RUBY_VERSION=$(cat .ruby-version)
+          if ! grep -q "^FROM ruby:$RUBY_VERSION" Dockerfile; then
+            echo "Dockerfile has wrong ruby: $(grep '^FROM ruby:' Dockerfile)" >&2
+            exit 1
+          fi
+          if ! grep -q "^ARG RUBY_VERSION=$RUBY_VERSION" Dockerfile.production; then
+            echo "Dockerfile.production has wrong ruby: $(grep '^ARG RUBY_VERSION' Dockerfile.production)" >&2
+            exit 1
+          fi