diff --git a/pkgs/development/compilers/4th/default.nix b/pkgs/development/compilers/4th/default.nix
index d76a5cc733c9..e2fd7567f11e 100644
--- a/pkgs/development/compilers/4th/default.nix
+++ b/pkgs/development/compilers/4th/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "4th";
-  version = "3.64.0";
+  version = "3.64.1";
 
   src = fetchurl {
     url = "https://sourceforge.net/projects/forth-4th/files/${pname}-${version}/${pname}-${version}-unix.tar.gz";
-    hash = "sha256-wJBekjFsFRIkhY/P/yHBQ8he+k+fGyrePGTP2Yjgpqg=";
+    hash = "sha256-+W6nTNsqrf3Dvr+NbSz3uJdrXVbBI3OHR5v/rs7en+M=";
   };
 
   patches = [