diff --git a/pkgs/tools/networking/stunnel/default.nix b/pkgs/tools/networking/stunnel/default.nix
index d16d9bfb0896..cfc4b2497b7a 100644
--- a/pkgs/tools/networking/stunnel/default.nix
+++ b/pkgs/tools/networking/stunnel/default.nix
@@ -1,11 +1,11 @@
 { stdenv, fetchurl, openssl }:
 
 stdenv.mkDerivation {
-  name = "stunnel-4.53";
+  name = "stunnel-4.56";
   
   src = fetchurl {
-    url = http://www.stunnel.org/downloads/stunnel-4.53.tar.gz;
-    sha256 = "3e640aa4c96861d10addba758b66e99e7c5aec8697764f2a59ca2268901b8e57";
+    url = http://www.stunnel.org/downloads/stunnel-4.56.tar.gz;
+    sha256 = "14qjhwfa0y17ipnd5mc970vfmralvgaxfl6fk0rl91vdwbxjrblw";
   };
 
   buildInputs = [openssl];