diff --git a/.github/workflows/integration_test.yaml b/.github/workflows/integration_test.yaml
index 8e4034b..60c34dd 100644
--- a/.github/workflows/integration_test.yaml
+++ b/.github/workflows/integration_test.yaml
@@ -8,9 +8,6 @@ jobs:
     uses: canonical/operator-workflows/.github/workflows/integration_test.yaml@main
     secrets: inherit
     with:
-      chaos-app-label: app.kubernetes.io/name=indico
-      chaos-enabled: false
-      chaos-experiments: pod-delete
       load-test-enabled: false
       load-test-run-args: "-e LOAD_TEST_HOST=localhost"
       zap-before-command: "curl -H \"Host: indico.local\" http://localhost/bootstrap --data-raw 'csrf_token=00000000-0000-0000-0000-000000000000&first_name=admin&last_name=admin&email=admin%40admin.com&username=admin&password=lunarlobster&confirm_password=lunarlobster&affiliation=Canonical'"
diff --git a/pyproject.toml b/pyproject.toml
index 0ed8d68..0fce3f3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,10 +34,16 @@ line_length = 99
 profile = "black"
 
 [tool.mypy]
-ignore_missing_imports = true
+check_untyped_defs = true
+disallow_untyped_defs = true
 explicit_package_bases = true
+ignore_missing_imports = true
 namespace_packages = true
 
+[[tool.mypy.overrides]]
+disallow_untyped_defs = false
+module = "tests.*"
+
 [tool.pylint]
 disable = "wrong-import-order"
 
diff --git a/src/charm.py b/src/charm.py
index 46227b1..e9b21ed 100755
--- a/src/charm.py
+++ b/src/charm.py
@@ -14,8 +14,10 @@
 """
 
 import logging
+import typing
 
 import ops
+from ops import pebble
 
 # Log messages can be retrieved using juju debug-log
 logger = logging.getLogger(__name__)
@@ -26,7 +28,7 @@
 class IsCharmsTemplateCharm(ops.CharmBase):
     """Charm the service."""
 
-    def __init__(self, *args):
+    def __init__(self, *args: typing.Any):
         """Construct.
 
         Args:
@@ -36,7 +38,7 @@ def __init__(self, *args):
         self.framework.observe(self.on.httpbin_pebble_ready, self._on_httpbin_pebble_ready)
         self.framework.observe(self.on.config_changed, self._on_config_changed)
 
-    def _on_httpbin_pebble_ready(self, event: ops.PebbleReadyEvent):
+    def _on_httpbin_pebble_ready(self, event: ops.PebbleReadyEvent) -> None:
         """Define and start a workload using the Pebble API.
 
         Change this example to suit your needs. You'll need to specify the right entrypoint and
@@ -57,7 +59,7 @@ def _on_httpbin_pebble_ready(self, event: ops.PebbleReadyEvent):
         # https://juju.is/docs/sdk/constructs#heading--statuses
         self.unit.status = ops.ActiveStatus()
 
-    def _on_config_changed(self, event: ops.ConfigChangedEvent):
+    def _on_config_changed(self, event: ops.ConfigChangedEvent) -> None:
         """Handle changed configuration.
 
         Change this example to suit your needs. If you don't need to handle config, you can remove
@@ -92,7 +94,7 @@ def _on_config_changed(self, event: ops.ConfigChangedEvent):
             self.unit.status = ops.BlockedStatus("invalid log level: '{log_level}'")
 
     @property
-    def _pebble_layer(self):
+    def _pebble_layer(self) -> pebble.LayerDict:
         """Return a dictionary representing a Pebble layer."""
         return {
             "summary": "httpbin layer",