diff --git a/testing/mozharness/mozharness.json b/testing/mozharness/mozharness.json
index b8f2c44a2384..0ffc8f4bd88a 100644
--- a/testing/mozharness/mozharness.json
+++ b/testing/mozharness/mozharness.json
@@ -1,4 +1,4 @@
 {
     "repo": "https://hg.mozilla.org/build/mozharness",
-    "revision": "3a852c322edf"
+    "revision": "31b90b80ad98"
 }