diff --git a/.gitignore b/.gitignore
index 2f53dea..6cb8cbc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,3 +28,6 @@ app/src/main/jni/**/obj/
 *.jks
 *.keystore
 keystore.properties
+
+# Local interop QA harness (test-CA keys, vendored source copies, logs)
+.harness/