diff --git a/pkgs/development/compilers/picat/default.nix b/pkgs/development/compilers/picat/default.nix
index 4898f991079c..960b5ce1c2c9 100644
--- a/pkgs/development/compilers/picat/default.nix
+++ b/pkgs/development/compilers/picat/default.nix
@@ -9,11 +9,11 @@ let
 in
 stdenv.mkDerivation {
   pname = "picat";
-  version = "3.0p3";
+  version = "3.0p4";
 
   src = fetchurl {
-    url    = "http://picat-lang.org/download/picat30_3_src.tar.gz";
-    sha256 = "052w0vk2xfmky5nv280ysb8in6vaph7i79yvbddqmahzszarq5hw";
+    url    = "http://picat-lang.org/download/picat30_4_src.tar.gz";
+    sha256 = "1rwin44m7ni2h2v51sh2r8gj2k6wm6f86zgaylrria9jr57inpqj";
   };
 
   buildInputs = [ zlib ];