diff --git a/pkgs/development/libraries/nspr/default.nix b/pkgs/development/libraries/nspr/default.nix
index 0497278f14a..f8423eb47f4 100644
--- a/pkgs/development/libraries/nspr/default.nix
+++ b/pkgs/development/libraries/nspr/default.nix
@@ -1,13 +1,13 @@
 { stdenv, fetchurl }:
 
-let version = "4.8.9"; in
+let version = "4.9"; in
 
 stdenv.mkDerivation {
   name = "nspr-${version}";
 
   src = fetchurl {
     url = "http://ftp.mozilla.org/pub/mozilla.org/nspr/releases/v${version}/src/nspr-${version}.tar.gz";
-    sha256 = "1khw7l80f0k5jbk37hw6xqqmv6pmsp2m4xlfj2xh6bz7374cfhzz";
+    sha1 = "57a6bb09ccb90d14303c3d9a6ec2592d8a5c0752";
   };
 
   preConfigure = "cd mozilla/nsprpub";