diff --git a/pkgs/servers/memcached/default.nix b/pkgs/servers/memcached/default.nix
index b45bef0cce8c..74033be8cf86 100644
--- a/pkgs/servers/memcached/default.nix
+++ b/pkgs/servers/memcached/default.nix
@@ -1,11 +1,11 @@
 {stdenv, fetchurl, cyrus_sasl, libevent}:
 
 stdenv.mkDerivation rec {
-  name = "memcached-1.4.17";
+  name = "memcached-1.4.20";
 
   src = fetchurl {
     url = "http://memcached.org/files/${name}.tar.gz";
-    sha1 = "2b4fc706d39579cf355e3358cfd27b44d40bd79c";
+    sha256 = "0620llasj8xgffk6hk2ml15z0c5i34455wwg60i1a2zdir023l95";
   };
 
   buildInputs = [cyrus_sasl libevent];