diff --git a/.github/workflows/version-check.yml b/.github/workflows/version-check.yml
new file mode 100644
index 0000000..30cbe43
--- /dev/null
+++ b/.github/workflows/version-check.yml
@@ -0,0 +1,38 @@
+name: Version Check
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  check-version:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Extract versions
+        id: versions
+        run: |
+          CARGO_VER=$(grep '^version' Cargo.toml | head -n1 | cut -d'"' -f2)
+          NPM_VER=$(node -p "require('./package.json').version")
+          echo "cargo=$CARGO_VER" >> $GITHUB_OUTPUT
+          echo "npm=$NPM_VER" >> $GITHUB_OUTPUT
+
+      - name: Verify version consistency
+        run: |
+          if [ "${{ steps.versions.outputs.cargo }}" != "${{ steps.versions.outputs.npm }}" ]; then
+            echo "Version mismatch: Cargo.toml (${{ steps.versions.outputs.cargo }}) vs package.json (${{ steps.versions.outputs.npm }})"
+            exit 1
+          fi
+
+      - name: Prevent duplicate release
+        run: |
+          VER="${{ steps.versions.outputs.cargo }}"
+          if git tag -l "v$VER" | grep -q "^v$VER$"; then
+            echo "Tag v$VER already exists. Duplicate release prevented."
+            exit 1
+          fi