diff --git a/pkgs/development/compilers/yosys/default.nix b/pkgs/development/compilers/yosys/default.nix
index 2356f3cea650..a0c02e26db0c 100644
--- a/pkgs/development/compilers/yosys/default.nix
+++ b/pkgs/development/compilers/yosys/default.nix
@@ -1,4 +1,5 @@
-{ stdenv, lib
+{ stdenv
+, lib
 , abc-verifier
 , bash
 , bison
@@ -33,13 +34,13 @@
 
 stdenv.mkDerivation rec {
   pname   = "yosys";
-  version = "0.9+3962";
+  version = "0.9+4052";
 
   src = fetchFromGitHub {
     owner  = "YosysHQ";
     repo   = "yosys";
-    rev    = "5d0cc54f5c36dea1d989438426a321b4554257c8";
-    sha256 = "1c85kga95lin6rcpr7cf80wr9f1a6irdrld9g23zmqdrxhick8y7";
+    rev    = "687f381b6985d9dda7e11535628e2fafff267af5";
+    sha256 = "15lcj798ckh9zwvdqb5gnvicilsxjyxv01gcviijg310hq62n7vf";
   };
 
   enableParallelBuilding = true;