diff --git a/pkgs/development/libraries/libpng/default.nix b/pkgs/development/libraries/libpng/default.nix
index 0e5a4a866e8f..9c1ed80e51ed 100644
--- a/pkgs/development/libraries/libpng/default.nix
+++ b/pkgs/development/libraries/libpng/default.nix
@@ -3,20 +3,20 @@
 assert zlib != null;
 
 let
-  patchVersion = "1.6.34";
+  patchVersion = "1.6.35";
   patch_src = fetchurl {
     url = "mirror://sourceforge/libpng-apng/libpng-${patchVersion}-apng.patch.gz";
-    sha256 = "1ha4npf9mfrzp0srg8a5amks5ww84xzfpjbsj8k3yjjpai798qg6";
+    sha256 = "011fq5wgyz07pfrqs9albixbiksx3agx5nkcf3535gbvhlwv5khq";
   };
   whenPatched = stdenv.lib.optionalString apngSupport;
 
 in stdenv.mkDerivation rec {
   name = "libpng" + whenPatched "-apng" + "-${version}";
-  version = "1.6.34";
+  version = "1.6.35";
 
   src = fetchurl {
     url = "mirror://sourceforge/libpng/libpng-${version}.tar.xz";
-    sha256 = "1xjr0v34fyjgnhvaa1zixcpx5yvxcg4zwvfh0fyklfyfj86rc7ig";
+    sha256 = "1mxwjf5cdzk7g0y51gl9w3f0j5ypcls05i89kgnifjaqr742x493";
   };
   postPatch = whenPatched "gunzip < ${patch_src} | patch -Np1";
 
diff --git a/pkgs/development/libraries/nss/default.nix b/pkgs/development/libraries/nss/default.nix
index 8a3de28b7842..e559b9a076ac 100644
--- a/pkgs/development/libraries/nss/default.nix
+++ b/pkgs/development/libraries/nss/default.nix
@@ -8,11 +8,11 @@ let
 
 in stdenv.mkDerivation rec {
   name = "nss-${version}";
-  version = "3.39";
+  version = "3.40";
 
   src = fetchurl {
-    url = "mirror://mozilla/security/nss/releases/NSS_3_39_RTM/src/${name}.tar.gz";
-    sha256 = "0jw6qlfl2g47hhx056nvnj6h92bk3sn46hy3ig61a911dzblvrkb";
+    url = "mirror://mozilla/security/nss/releases/NSS_3_40_RTM/src/${name}.tar.gz";
+    sha256 = "1p9jidi3nysirf3lhkrqkjjrf2cw3y2wz2jgjvsjn1ysidxhhqh5";
   };
 
   buildInputs = [ perl zlib sqlite ]