diff --git a/check_version_sync.py b/check_version_sync.py
index 23c13b1b..40a4628e 100755
--- a/check_version_sync.py
+++ b/check_version_sync.py
@@ -14,7 +14,8 @@ with open(os.path.join("webapp", "package.json"), "r", encoding="utf-8") as json
 py_ver = pyproject_data["project"]["version"]
 js_ver = webapp_data["version"]
 
-assert py_ver == js_ver, (
+# Allow an assert here as this is a CI script, not production code.
+assert py_ver == js_ver, (  # noqa S101
     "The python and javascript version numbers should match.\n"
     f"Python version: {py_ver}\n"
     f"Javascript version: {js_ver}\n"
diff --git a/pyproject.toml b/pyproject.toml
index 9957a3b6..3cef0b2d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -126,6 +126,7 @@ select = [
     "N", # PEP8 naming
     "D", # Docstring checks
     "ERA001", # Commented out code!
+    "S101",# No asserts!
     "ANN",
 ]
 
@@ -139,14 +140,10 @@ ignore = [
 ]
 
 [tool.ruff.lint.per-file-ignores]
-# Tests are currently not fully docstring-ed, we'll ignore this for now.
-"tests/*" = [
-    "B018", # Complaining about useless attribute access in tests, but we need them to check errors are raised
-    "ANN", # Tests are not typehinted for fixtures etc
-]
-"hardware-specific-tests/*" = [
+"{tests,integration-tests,hardware-specific-tests}/**" = [
     "B018", # Complaining about useless attribute access in tests, but we need them to check errors are raised
     "ANN", # Tests are not typehinted for fixtures etc
+    "S101", # Allow asserts in tests
 ]
 
 [tool.ruff.lint.pydocstyle]
diff --git a/src/openflexure_microscope_server/things/camera/picamera_tuning_file_utils.py b/src/openflexure_microscope_server/things/camera/picamera_tuning_file_utils.py
index 00e5a0d3..f86753c7 100644
--- a/src/openflexure_microscope_server/things/camera/picamera_tuning_file_utils.py
+++ b/src/openflexure_microscope_server/things/camera/picamera_tuning_file_utils.py
@@ -38,7 +38,8 @@ def set_static_lst(
     adaptive tweaking by the algorithm.
     """
     for table in luminance, cr, cb:
-        assert np.array(table).shape == (12, 16), "Lens shading tables must be 12x16!"
+        if np.array(table).shape != (12, 16):
+            raise ValueError("Lens shading tables must be 12x16!")
     alsc = Picamera2.find_tuning_algo(tuning, "rpi.alsc")
     alsc["n_iter"] = 0  # disable the adaptive part
     alsc["luminance_strength"] = 1.0