diff --git a/.github/workflows/backend.yml b/.github/workflows/backend.yml
index 71b37d6..0e5e9ca 100644
--- a/.github/workflows/backend.yml
+++ b/.github/workflows/backend.yml
@@ -7,6 +7,16 @@ on:
   pull_request:
 
 jobs:
+  composer-validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.3'
+      - uses: actions/checkout@v4
+      - name: Validate
+        run: composer validate --strict --check-lock
+
   test:
     runs-on: ubuntu-latest
     steps:
diff --git a/.github/workflows/frontend.yml b/.github/workflows/frontend.yml
index 2134a05..95a6d3a 100644
--- a/.github/workflows/frontend.yml
+++ b/.github/workflows/frontend.yml
@@ -7,6 +7,18 @@ on:
   pull_request:
 
 jobs:
+  dedupe:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: pnpm/action-setup@v2
+        with:
+          version: 8.14.1
+      - name: Install dependencies
+        run: pnpm install
+      - name: Check dedupe
+        run: pnpm dedupe --check
+
   test:
     runs-on: ubuntu-latest
     steps:
diff --git a/.npmrc b/.npmrc
index 093246b..4f94a8e 100644
--- a/.npmrc
+++ b/.npmrc
@@ -1,2 +1,3 @@
 engine-strict=true
+strict-peer-dependencies=true
 use-node-version=20.11.0