diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e36224b..ca396ef 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -18,20 +18,25 @@ jobs:
       - uses: actions/setup-python@v1
         with:
           python-version: 3.8
+      - name: Store installed Python version
+        run: |
+          echo "::set-env name=PY_VERSION::"\
+          "$(python -c "import platform;print(platform.python_version())")"
       - name: Cache pip test requirements
         uses: actions/cache@v1
         with:
           path: ${{ env.PIP_CACHE_DIR }}
-          key: "${{ runner.os }}-pip-test-\
+          key: "${{ runner.os }}-pip-test-py${{ env.PY_VERSION }}-\
             ${{ hashFiles('**/requirements-test.txt') }}"
           restore-keys: |
+            ${{ runner.os }}-pip-test-py${{ env.PY_VERSION }}-
             ${{ runner.os }}-pip-test-
             ${{ runner.os }}-pip-
       - name: Cache pre-commit hooks
         uses: actions/cache@v1
         with:
           path: ${{ env.PRE_COMMIT_CACHE_DIR }}
-          key: "${{ runner.os }}-pre-commit-\
+          key: "${{ runner.os }}-pre-commit-py${{ env.PY_VERSION }}-\
             ${{ hashFiles('**/.pre-commit-config.yaml') }}"
       - name: Install dependencies
         run: |
@@ -46,13 +51,18 @@ jobs:
       - uses: actions/setup-python@v1
         with:
           python-version: 3.8
+      - name: Store installed Python version
+        run: |
+          echo "::set-env name=PY_VERSION::"\
+          "$(python -c "import platform;print(platform.python_version())")"
       - name: Cache pip test requirements
         uses: actions/cache@v1
         with:
           path: ${{ env.PIP_CACHE_DIR }}
-          key: "${{ runner.os }}-pip-test-\
+          key: "${{ runner.os }}-pip-test-py${{ env.PY_VERSION }}-\
             ${{ hashFiles('**/requirements-test.txt') }}"
           restore-keys: |
+            ${{ runner.os }}-pip-test-py${{ env.PY_VERSION }}-
             ${{ runner.os }}-pip-test-
             ${{ runner.os }}-pip-
       - name: Install dependencies
@@ -76,13 +86,18 @@ jobs:
       - uses: actions/setup-python@v1
         with:
           python-version: 3.8
+      - name: Store installed Python version
+        run: |
+          echo "::set-env name=PY_VERSION::"\
+          "$(python -c "import platform;print(platform.python_version())")"
       - name: Cache pip build requirements
         uses: actions/cache@v1
         with:
           path: ${{ env.PIP_CACHE_DIR }}
-          key: "${{ runner.os }}-pip-build-\
+          key: "${{ runner.os }}-pip-build-py${{ env.PY_VERSION }}-\
             ${{ hashFiles('**/requirements.txt') }}"
           restore-keys: |
+            ${{ runner.os }}-pip-build-py${{ env.PY_VERSION }}-
             ${{ runner.os }}-pip-build-
             ${{ runner.os }}-pip-
       - name: Install dependencies
diff --git a/.gitignore b/.gitignore
index 724760e..2d46316 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,7 @@
-*.egg-info
+.mypy_cache
 __pycache__
-.python-version
 .coverage
 .pytest_cache
+.python-version
+*.egg-info
+skeleton-aws-lambda.zip
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 1522593..df79e95 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -47,7 +47,7 @@ repos:
         additional_dependencies:
           - flake8-docstrings
   - repo: https://github.com/asottile/pyupgrade
-    rev: v1.26.2
+    rev: v2.0.0
     hooks:
       - id: pyupgrade
   # Run bandit on "tests" tree with a configuration
@@ -84,7 +84,7 @@ repos:
     rev: v4.2.0
     hooks:
       - id: ansible-lint
-        # files: molecule/default/playbook.yml
+      # files: molecule/default/playbook.yml
   - repo: https://github.com/antonbabenko/pre-commit-terraform.git
     rev: v1.12.0
     hooks:
@@ -98,3 +98,7 @@ repos:
     rev: 1.19.1
     hooks:
       - id: prettier
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v0.761
+    hooks:
+      - id: mypy
diff --git a/lambda_handler.py b/lambda_handler.py
index 9cbaafe..7428cfa 100644
--- a/lambda_handler.py
+++ b/lambda_handler.py
@@ -25,10 +25,10 @@
 # and
 # https://stackoverflow.com/questions/37703609/using-python-logging-with-aws-lambda
 # for more details.
-root = logging.getLogger()
-if root.handlers:
-    for handler in root.handlers:
-        root.removeHandler(handler)
+logging_root = logging.getLogger()
+if logging_root.handlers:
+    for logging_handler in logging_root.handlers:
+        logging_root.removeHandler(logging_handler)
 
 
 def handler(event, context):