diff --git a/tools/requirements.txt b/tools/requirements.txt
index 21b66c5ee..ec1a4ec31 100644
--- a/tools/requirements.txt
+++ b/tools/requirements.txt
@@ -3,4 +3,4 @@ async-timeout==3.0.1
 logbook==1.5.3
 raven==6.10.0
 structlog==20.1.0
-taskcluster==38.0.6
+taskcluster==39.0.0