diff --git a/Makefile b/Makefile
index 0784f44..797134d 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@ test-lint: ## Run code linting tests
 	pylint --errors-only --enable=unused-import,unused-argument --ignore=templates --ignore=docs/_ext ${SRC_DIRS}
 
 test-types: ## Run type checks.
-	mypy --exclude=templates --ignore-missing-imports --implicit-reexport ${SRC_DIRS}
+	mypy --exclude=templates --ignore-missing-imports --implicit-reexport --strict ${SRC_DIRS}
 
 format: ## Format code automatically
 	black $(BLACK_OPTS)
diff --git a/tutorpicasso/commands/enable_themes.py b/tutorpicasso/commands/enable_themes.py
index c92f13c..cf5348b 100644
--- a/tutorpicasso/commands/enable_themes.py
+++ b/tutorpicasso/commands/enable_themes.py
@@ -1,6 +1,8 @@
 import os
 import subprocess
 
+from typing import Any
+
 import click
 from tutor import config as tutor_config
 
@@ -18,7 +20,7 @@ def enable_themes() -> None:
         .decode("utf-8")
         .strip()
     )
-    config = tutor_config.load(tutor_root)
+    config: Any = tutor_config.load(tutor_root)
 
     if config.get("PICASSO_THEMES"):
         for theme in config["PICASSO_THEMES"]:
diff --git a/tutorpicasso/commands/run_extra_commands.py b/tutorpicasso/commands/run_extra_commands.py
index 0d2e75a..68528ac 100644
--- a/tutorpicasso/commands/run_extra_commands.py
+++ b/tutorpicasso/commands/run_extra_commands.py
@@ -2,7 +2,7 @@
 import subprocess
 
 # Was necessary to use this for compatibility with Python 3.8
-from typing import List
+from typing import List, Any
 
 import click
 from tutor import config as tutor_config
@@ -28,7 +28,7 @@ def run_extra_commands() -> None:
             run_command(command)
 
 
-def validate_commands(commands: List[str]) -> None:
+def validate_commands(commands: Any) -> None:
     """
     Takes all the extra commands sent through config.yml and verifies that
     all the commands are correct before executing them