diff --git a/pkgs/development/libraries/nss/default.nix b/pkgs/development/libraries/nss/default.nix
index 5c73f5db26fc..0a25e24fc543 100644
--- a/pkgs/development/libraries/nss/default.nix
+++ b/pkgs/development/libraries/nss/default.nix
@@ -11,11 +11,11 @@ let
 
 in stdenv.mkDerivation rec {
   name = "nss-${version}";
-  version = "3.19.3";
+  version = "3.20";
 
   src = fetchurl {
-    url = "http://ftp.mozilla.org/pub/mozilla.org/security/nss/releases/NSS_3_19_3_RTM/src/${name}.tar.gz";
-    sha256 = "c56bdad20736a8227afb3c97b25d6d2eb3982e979ddc9be1d66cb7199ae8ca8f";
+    url = "http://ftp.mozilla.org/pub/mozilla.org/security/nss/releases/NSS_3_20_RTM/src/${name}.tar.gz";
+    sha256 = "5e38d4b9837ca338af966b97fc91c07f67ad647fb38dc4af3cfd0d84e477d15c";
   };
 
   buildInputs = [ nspr perl zlib sqlite ];