diff --git a/nix/pkgs/python3Packages.nix b/nix/pkgs/python3Packages.nix
index d35d80aba..898bd97a9 100644
--- a/nix/pkgs/python3Packages.nix
+++ b/nix/pkgs/python3Packages.nix
@@ -91,8 +91,8 @@ rec {
     src = fetchFromGitHub {
       owner = "m-labs";
       repo = "jesd204b";
-      rev = "03d3280690727b12b6522cbd294138e66dd157c9";
-      sha256 = "1hpx4y8ynhsmwsq4ry748q6bkh8jvv2hy8b7hifxjmlh174y8rb0";
+      rev = "2fd6391c0a9197580d60f7d8a146191dc7337b03";
+      sha256 = "1lhw8f0dp42xx4g6d7hyhqhrnd6i5ll4a1wcg265rqz3600i4009";
     };
 
     propagatedBuildInputs = with python3Packages; [ migen misoc ];