diff --git a/eda/nmigen.nix b/eda/nmigen.nix
index c4ffb6a..37eaf87 100644
--- a/eda/nmigen.nix
+++ b/eda/nmigen.nix
@@ -6,8 +6,8 @@ python3Packages.buildPythonPackage {
   src = fetchFromGitHub {
     owner = "m-labs";
     repo = "nmigen";
-    rev = "9a1048af50aa2f7b8b75260832e8849255190253";
-    sha256 = "1f1i661wyn674hcsalmg5py2z178kqdhmfi1lwpfjz3vhgxsy0cv";
+    rev = "668ff40a75dea407bd70c49e730d8ff282454883";
+    sha256 = "1lvcralx79ycy2yjyd80dggf02pkwx66d2mla9siivki7z4jllx6";
   };
 
   checkPhase = "PATH=${yosys}/bin:${symbiyosys}/bin:${yices}/bin:$PATH python -m unittest discover nmigen.test -v";