diff --git a/pkgs/tools/networking/stunnel/default.nix b/pkgs/tools/networking/stunnel/default.nix
index ef9c56deacb..31acb8dd9ec 100644
--- a/pkgs/tools/networking/stunnel/default.nix
+++ b/pkgs/tools/networking/stunnel/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name    = "stunnel-${version}";
-  version = "5.16";
+  version = "5.20";
 
   src = fetchurl {
     url    = "http://www.stunnel.org/downloads/${name}.tar.gz";
-    sha256 = "13b0ad7smz4949hchdgsx3yjr5i3z8flwiy8w6xalvk2n8zykdxn";
+    sha256 = "0ar940mw5sjxkh98d6wnrd366jfkqirbyf2b5kcdk1vjk9ra6dja";
   };
 
   buildInputs = [ openssl ];