diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a60832c..af0b945 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,7 @@ concurrency:
 
 env:
   MACH_VERSION: 6.10.1
-  MACH_REF: 5552578fac6ea9bc60015957c3b5fb890d3b5a87
+  MACH_REF: ac39ae9f12a6075605ef2670f1638d8418c87839
 
 jobs:
   # every runner builds every artifact for every target and tests the ones it can run