diff --git a/.CodeQL.yml b/.CodeQL.yml
new file mode 100644
index 000000000..11ff3db6b
--- /dev/null
+++ b/.CodeQL.yml
@@ -0,0 +1,9 @@
+path_classifiers:
+  test_data:
+    # *.TestData folders are not themselves shipping production or test code.
+    # Rather, they represent raw data intended to be processed by our tests.
+    # For more information, see:
+    # https://eng.ms/docs/cloud-ai-platform/devdiv/one-engineering-system-1es/1es-docs/codeql/troubleshooting/bugs/generated-library-code
+    - "src/*.TestData"
+    - "src/*.TimeZoneData"
+    - "src/*.UnicodeData"