diff --git a/pkgs/development/libraries/nspr/default.nix b/pkgs/development/libraries/nspr/default.nix
index d9b7ff13d1a..e8893bc2040 100644
--- a/pkgs/development/libraries/nspr/default.nix
+++ b/pkgs/development/libraries/nspr/default.nix
@@ -2,7 +2,7 @@
 , CoreServices ? null
 , buildPackages }:
 
-let version = "4.28"; in
+let version = "4.29"; in
 
 stdenv.mkDerivation {
   pname = "nspr";
@@ -10,7 +10,7 @@ stdenv.mkDerivation {
 
   src = fetchurl {
     url = "mirror://mozilla/nspr/releases/v${version}/src/nspr-${version}.tar.gz";
-    sha256 = "0miv8ggil1xdywxw2sxaa05kqw7ahjgaimf7zjc6y2x8367grpk3";
+    sha256 = "22286bdb8059d74632cc7c2865c139e63953ecfb33bf4362ab58827e86e92582";
   };
 
   patches = [