diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index acf4a9030..4ca2b67f4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -104,8 +104,9 @@ jobs:
         flake8 .
         black onefuzz examples tests --check
         isort --profile black ./onefuzz ./examples/ ./tests/ --check
-        mypy . --ignore-missing-imports
         pytest -v tests
+        ../ci/disable-py-cache.sh
+        mypy . --ignore-missing-imports
 
         # set a minimum confidence to ignore known false positives
         vulture --min-confidence 61 onefuzz
diff --git a/src/ci/disable-py-cache.sh b/src/ci/disable-py-cache.sh
index 9e2afc4dc..6759b1b33 100755
--- a/src/ci/disable-py-cache.sh
+++ b/src/ci/disable-py-cache.sh
@@ -15,4 +15,4 @@ set -ex
 SCRIPT_DIR=$(dirname ${BASH_SOURCE[0]})
 
 sed -i "s/^from memoization import cached/##### from memoization import cached/" $(find . -name '*.py' -not -path .python_packages)
-sed -i "s/^@cached/##### @cached/" $(find . -name '*.py' -not -path .python_packages)
+sed -i "s/@cached/##### @cached/" $(find . -name '*.py' -not -path .python_packages)
diff --git a/src/ci/enable-py-cache.sh b/src/ci/enable-py-cache.sh
index 403457302..9d15fbee2 100755
--- a/src/ci/enable-py-cache.sh
+++ b/src/ci/enable-py-cache.sh
@@ -14,4 +14,4 @@ set -ex
 SCRIPT_DIR=$(dirname ${BASH_SOURCE[0]})
 
 sed -i "s/^##### from memoization import cached/from memoization import cached/" $(find . -name '*.py' -not -path .python_packages)
-sed -i "s/^##### @cached/@cached/" $(find . -name '*.py' -not -path .python_packages)
+sed -i "s/##### @cached/@cached/" $(find . -name '*.py' -not -path .python_packages)
diff --git a/src/cli/onefuzz/api.py b/src/cli/onefuzz/api.py
index f632df659..53495aa0e 100644
--- a/src/cli/onefuzz/api.py
+++ b/src/cli/onefuzz/api.py
@@ -11,7 +11,7 @@ import subprocess  # nosec
 import uuid
 from enum import Enum
 from shutil import which
-from typing import Callable, Dict, List, Optional, Tuple, Type, TypeVar, cast
+from typing import Callable, Dict, List, Optional, Tuple, Type, TypeVar
 from uuid import UUID
 
 import pkg_resources
@@ -178,7 +178,7 @@ class Files(Endpoint):
         """ get a file from a container """
         self.logger.debug("getting file from container: %s:%s", container, filename)
         client = self._get_client(container)
-        downloaded = cast(bytes, client.download_blob(filename))
+        downloaded = client.download_blob(filename)
         return downloaded
 
     def upload_file(