diff --git a/pkgs/servers/zookeeper/default.nix b/pkgs/servers/zookeeper/default.nix
index c90684e0fe0d..c382061f1ef6 100644
--- a/pkgs/servers/zookeeper/default.nix
+++ b/pkgs/servers/zookeeper/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name = "zookeeper-${version}";
-  version = "3.4.11";
+  version = "3.4.12";
 
   src = fetchurl {
     url = "mirror://apache/zookeeper/${name}/${name}.tar.gz";
-    sha256 = "110fs5manyaq6rxbzwzs9x3aqw8d5l4177y9qaj3xhgpr2hniggn";
+    sha256 = "1fcljn2741jw1jvjrk5a0xr8rk69wjwrq522wrc5nmjhj0qzk1n6";
   };
 
   buildInputs = [ makeWrapper jre ];