diff --git a/WORKSPACE b/WORKSPACE
index 4d6ed65..71f8169 100755
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -10,9 +10,9 @@ new_http_archive(
 
 new_http_archive(
   name = "zlib_archive",
-  url = "http://zlib.net/fossils/zlib-1.2.10.tar.gz",
-  sha256 = "8d7e9f698ce48787b6e1c67e6bff79e487303e66077e25cb9784ac8835978017",
-  strip_prefix = "zlib-1.2.10",
+  url = "http://zlib.net/fossils/zlib-1.2.11.tar.gz",
+  sha256 = "c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1",
+  strip_prefix = "zlib-1.2.11",
   build_file = "zlib.BUILD",
 )