diff --git a/testing/mozharness/mozharness.json b/testing/mozharness/mozharness.json
index 428a588e30f6..4bccaac5cd40 100644
--- a/testing/mozharness/mozharness.json
+++ b/testing/mozharness/mozharness.json
@@ -1,4 +1,4 @@
 {
     "repo": "https://hg.mozilla.org/build/mozharness",
-    "revision": "1a2600cf03fc"
+    "revision": "4d260376921f"
 }