1 files changed, 3 insertions, 3 deletions
diff --git a/pkgs/development/compilers/yosys/default.nix b/pkgs/development/compilers/yosys/default.nix
index a0c02e26db0..08f0ee22714 100644
--- a/pkgs/development/compilers/yosys/default.nix
+++ b/pkgs/development/compilers/yosys/default.nix
@@ -34,13 +34,13 @@
 
 stdenv.mkDerivation rec {
   pname   = "yosys";
-  version = "0.9+4052";
+  version = "0.9+4221";
 
   src = fetchFromGitHub {
     owner  = "YosysHQ";
     repo   = "yosys";
-    rev    = "687f381b6985d9dda7e11535628e2fafff267af5";
-    sha256 = "15lcj798ckh9zwvdqb5gnvicilsxjyxv01gcviijg310hq62n7vf";
+    rev    = "9600f20be887b707f6d5d3f74dec58b336e2464e";
+    sha256 = "0xbvbnhc6qvcq1c8zxfyf4ws959c824z660nrghfxyzkrjl8wi1h";
   };
 
   enableParallelBuilding = true;