diff --git a/pkgs/applications/science/electronics/gtkwave/default.nix b/pkgs/applications/science/electronics/gtkwave/default.nix
index 87a18c20e99..72c3f3e2435 100644
--- a/pkgs/applications/science/electronics/gtkwave/default.nix
+++ b/pkgs/applications/science/electronics/gtkwave/default.nix
@@ -1,10 +1,10 @@
 {stdenv, fetchurl, gtk, gperf, pkgconfig, bzip2, xz, tcl, tk, judy} :
 stdenv.mkDerivation rec {
-  name = "gtkwave-3.3.11";
+  name = "gtkwave-3.3.20";
 
   src = fetchurl {
     url = "mirror://sourceforge/gtkwave/${name}.tar.gz";
-    sha256 = "1krhxdpzj2ma3xisbk0d9yzhlk1i60hgkkfycc2nsqqirqrvdpbr";
+    sha256 = "0r2yh8a5rrxjzvykdmqlb098wws5c9k255saf2bsdchnigs8il3n";
   };
 
   buildInputs = [ gtk gperf pkgconfig bzip2 xz tcl tk judy];