diff --git a/pkgs/development/compilers/swi-prolog/default.nix b/pkgs/development/compilers/swi-prolog/default.nix
index 2070da0bee4..220d3f87fba 100644
--- a/pkgs/development/compilers/swi-prolog/default.nix
+++ b/pkgs/development/compilers/swi-prolog/default.nix
@@ -4,14 +4,14 @@
 }:
 
 let
-  version = "6.6.3";
+  version = "6.6.5";
 in
 stdenv.mkDerivation {
   name = "swi-prolog-${version}";
 
   src = fetchurl {
     url = "http://www.swi-prolog.org/download/stable/src/pl-${version}.tar.gz";
-    sha256 = "01dr66d7rm2xvxwm6wy71bbjvfrmzxgvmaz3sl1fb63cn8d78nz3";
+    sha256 = "0lsa90sdnkd286xgm1amwkdhvnrpsz7imfzczrfdaw4arqk4bvkr";
   };
 
   buildInputs = [ gmp readline openssl libjpeg unixODBC libXinerama