diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5ec42d4c608..40cd00b7e43 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -40,10 +40,16 @@ jobs:
         source $HOME/.poetry/env
         poetry config virtualenvs.in-project true
     - name: Set up cache
+      id: cache
       uses: actions/cache@v1
       with:
         path: .venv
         key: venv-${{ runner.os }}-${{ steps.full-python-version.outputs.version }}-${{ hashFiles('**/poetry.lock') }}
+    - name: Ensure cache is healthy
+      if: steps.cache.outputs.cache-hit == 'true'
+      run: |
+        source $HOME/.poetry/env
+        poetry run pip --version >/dev/null 2>&1 || rm -rf .venv
     - name: Install dependencies
       run: |
         source $HOME/.poetry/env
@@ -76,10 +82,16 @@ jobs:
         source $HOME/.poetry/env
         poetry config virtualenvs.in-project true
     - name: Set up cache
+      id: cache
       uses: actions/cache@v1
       with:
         path: .venv
         key: venv-${{ runner.os }}-${{ steps.full-python-version.outputs.version }}-${{ hashFiles('**/poetry.lock') }}
+    - name: Ensure cache is healthy
+      if: steps.cache.outputs.cache-hit == 'true'
+      run: |
+        source $HOME/.poetry/env
+        poetry run pip --version >/dev/null 2>&1 || rm -rf .venv
     - name: Install dependencies
       run: |
         source $HOME/.poetry/env
@@ -113,10 +125,17 @@ jobs:
         $env:Path += ";$env:Userprofile\.poetry\bin"
         poetry config virtualenvs.in-project true
     - name: Set up cache
+      id: cache
       uses: actions/cache@v1
       with:
         path: .venv
         key: venv-${{ runner.os }}-${{ steps.full-python-version.outputs.version }}-${{ hashFiles('**/poetry.lock') }}
+    - name: Ensure cache is healthy
+      if: steps.cache.outputs.cache-hit == 'true'
+      shell: bash
+      run: |
+        source $(cmd.exe /C echo %USERPROFILE%)/.poetry/env
+        poetry run pip --version >/dev/null 2>&1 || rm -rf .venv
     - name: Install dependencies
       run: |
         $env:Path += ";$env:Userprofile\.poetry\bin"