diff --git a/pkgs/tools/networking/stunnel/default.nix b/pkgs/tools/networking/stunnel/default.nix
index 4895c95bba19..b8737724cc0e 100644
--- a/pkgs/tools/networking/stunnel/default.nix
+++ b/pkgs/tools/networking/stunnel/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "stunnel";
-  version = "5.63";
+  version = "5.64";
 
   src = fetchurl {
     url    = "https://www.stunnel.org/downloads/${pname}-${version}.tar.gz";
-    sha256 = "sha256-x0xOFRRKOuNLi4kLsxyQkgcwFJC9HlG/qqX/6wqZRhc=";
+    sha256 = "sha256-7r5T7RFrpDsueGdisMK5FRHnt0hXrUdlgk5xmeb6+IM=";
     # please use the contents of "https://www.stunnel.org/downloads/${name}.tar.gz.sha256",
     # not the output of `nix-prefetch-url`
   };