diff --git a/pkgs/tools/compression/upx/default.nix b/pkgs/tools/compression/upx/default.nix
index 2dd4d7eb7945..283b751cf26a 100644
--- a/pkgs/tools/compression/upx/default.nix
+++ b/pkgs/tools/compression/upx/default.nix
@@ -1,10 +1,10 @@
 {stdenv, fetchurl, ucl, zlib}:
 
 stdenv.mkDerivation {
-  name = "upx-3.09";
+  name = "upx-3.91";
   src = fetchurl {
-    url = mirror://sourceforge/upx/upx-3.09-src.tar.bz2;
-    sha256 = "16jwynharr1silfd6vlxl9i94fs8mg79qp72dr48r3wv9mlra6pn";
+    url = mirror://sourceforge/upx/upx-3.91-src.tar.bz2;
+    sha256 = "0g3aiinlcb37z1xhs202h2qrgbf8dygiyarmflbgahcq89byfz2j";
   };
 
   buildInputs = [ ucl zlib ];