diff --git a/pkgs/development/compilers/arachne-pnr/default.nix b/pkgs/development/compilers/arachne-pnr/default.nix
index 52a3b485d91e..6508b05a5348 100644
--- a/pkgs/development/compilers/arachne-pnr/default.nix
+++ b/pkgs/development/compilers/arachne-pnr/default.nix
@@ -2,13 +2,13 @@
 
 stdenv.mkDerivation rec {
   name = "arachne-pnr-${version}";
-  version = "2016.08.18";
+  version = "2017.06.29";
 
   src = fetchFromGitHub {
     owner = "cseed";
     repo = "arachne-pnr";
-    rev = "52e69ed207342710080d85c7c639480e74a021d7";
-    sha256 = "15bdw5yxj76lxrwksp6liwmr6l1x77isf4bs50ys9rsnmiwh8c3w";
+    rev = "7e135edb31feacde85ec5b7e5c03fc9157080977";
+    sha256 = "1wszcx6hgw4q4r778zswrlwdwvwxq834bkajck8w9yfqwxs9lmq8";
   };
 
   preBuild = ''
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
       the IceStorm [2] icepack command.
     '';
     homepage = https://github.com/cseed/arachne-pnr;
-    license = stdenv.lib.licenses.gpl2;
+    license = stdenv.lib.licenses.mit;
     maintainers = [ stdenv.lib.maintainers.shell ];
     platforms = stdenv.lib.platforms.linux;
   };