diff --git a/pkgs/development/compilers/arachne-pnr/default.nix b/pkgs/development/compilers/arachne-pnr/default.nix
index 7db75d129781..1e7791c84c44 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 = "2017.11.05";
+  version = "2017.12.06";
 
   src = fetchFromGitHub {
     owner  = "cseed";
     repo   = "arachne-pnr";
-    rev    = "1e81432830c75c505c76e419619f605a6c4c7583";
-    sha256 = "0lzblmi1klbsmd32h8nh027npm1z1a199lng13lcrqwr17lhb7my";
+    rev    = "a32dd2c137b2bb6ba6704b25109790ac76bc2f45";
+    sha256 = "16pfm8spcm3nsrdsjdj22v7dddnwzlhbj1y71wflvvb84xnbga2y";
   };
 
   enableParallelBuilding = true;