diff --git a/pkgs/development/compilers/yosys/default.nix b/pkgs/development/compilers/yosys/default.nix
index 117319c1ad5..4f4a54ef426 100644
--- a/pkgs/development/compilers/yosys/default.nix
+++ b/pkgs/development/compilers/yosys/default.nix
@@ -4,21 +4,21 @@
 
 stdenv.mkDerivation rec {
   name = "yosys-${version}";
-  version = "2017.12.06";
+  version = "2018.01.10";
 
   srcs = [
     (fetchFromGitHub {
       owner  = "cliffordwolf";
       repo   = "yosys";
-      rev    = "8f2638ae2f12a48dcad14f24b0211c16ac724762";
-      sha256 = "0synbskclgn97hp28myvl0hp8pqp66awp37z4cv7zl154ipysfl1";
+      rev    = "9ac560f5d3e5847b7e475195f66b7034e91fd938";
+      sha256 = "01p1bcjq030y7g21lsghgkqj23x6yl8cwrcx2xpik45xls6pxrg7";
       name   = "yosys";
     })
     (fetchFromBitbucket {
       owner  = "alanmi";
       repo   = "abc";
-      rev    = "31fc97b0aeed";
-      sha256 = "0ljmclr4hfh3iiyfw7ji0fm8j983la8021xfpnfd20dyc807hh65";
+      rev    = "6e3c24b3308a";
+      sha256 = "1i4wv0si4fb6dpv2yrpkp588mdlfrnx2s02q2fgra5apdm54c53w";
       name   = "yosys-abc";
     })
   ];