diff --git a/pkgs/tools/networking/stunnel/default.nix b/pkgs/tools/networking/stunnel/default.nix
index 039f9bc09139..2dba887adb8d 100644
--- a/pkgs/tools/networking/stunnel/default.nix
+++ b/pkgs/tools/networking/stunnel/default.nix
@@ -2,12 +2,11 @@
 
 stdenv.mkDerivation rec {
   name    = "stunnel-${version}";
-  version = "5.05";
+  version = "5.11";
 
   src = fetchurl {
     url    = "http://www.stunnel.org/downloads/${name}.tar.gz";
-    # SHA256 provided by upstream.
-    sha256 = "c7e1653345150db7e48d00e1129cf571c7c85de8e7e1aa70b21cf1d76b1e31ef";
+    sha256 = "137zxnavc7880fxfbmhlgw97lk4rj8if1bb70adm0d4fwlvvra3i";
   };
 
   buildInputs = [ openssl ];