diff --git a/DEPS b/DEPS
index 8bd692e..40a8c32 100644
--- a/DEPS
+++ b/DEPS
@@ -103,7 +103,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling zlib
   # and whatever else without interference from each other.
-  'zlib_revision': '1b274918e40f45b80d39173919e1ef5550dc40a6',
+  'zlib_revision': '21c6af6f18e5ad9c3b9d103f8cfdbf926ca35f7c',
 }
 
 deps = {