diff --git a/.github/actions/setup-poetry/action.yml b/.github/actions/setup-poetry/action.yml
index e180b2e..26f34a1 100644
--- a/.github/actions/setup-poetry/action.yml
+++ b/.github/actions/setup-poetry/action.yml
@@ -28,12 +28,16 @@ runs:
         installer-parallel: true
         plugins: poetry-plugin-export==1.8.0
 
+    - name: Validate lock file
+      run: poetry check --lock
+      shell: bash
+
     - name: Load cached venv
       id: cached-poetry-dependencies
       uses: actions/cache@v4
       with:
         path: .venv
-        key: venv-${{ runner.os }}-${{ inputs.python-version }}-${{ hashFiles('**/poetry.lock') }}
+        key: venv-${{ runner.os }}-${{ inputs.python-version }}-${{ hashFiles('pyproject.toml', 'poetry.lock') }}
         restore-keys: |
           venv-${{ runner.os }}-${{ inputs.python-version }}-
 
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 3965e70..4740245 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -2,10 +2,11 @@ name: validate
 
 on:
   pull_request:
-    types: [opened, synchronize, reopened, edited]
+    types: [opened, synchronize, reopened, edited, ready_for_review]
 
 jobs:
   pr-title:
+    if: github.event.pull_request.draft == false
     runs-on: ubuntu-latest
     permissions:
       pull-requests: write