diff --git a/artiq-fast/pkgs/python-deps.nix b/artiq-fast/pkgs/python-deps.nix
index 335ffef..f35264a 100644
--- a/artiq-fast/pkgs/python-deps.nix
+++ b/artiq-fast/pkgs/python-deps.nix
@@ -104,13 +104,13 @@ rec {
 
   migen = python3Packages.buildPythonPackage rec {
     pname = "migen";
-    version = "unstable-2021-09-14";
+    version = "unstable-2021-10-07";
 
     src = fetchFromGitHub {
       owner = "m-labs";
       repo = "migen";
-      rev = "a5bc262560238f93ceaad423820eb06843326274";
-      sha256 = "1akbzi6rkg9i06k7s914z9fxrcpbfk23vnx5qz31xz56hrl26rfz";
+      rev = "6e3f8e565704b4293174aedfb15b3470d233f528";
+      sha256 = "127xlidkd5n42w72yj77cprs7934qr7p88a3ahls6454adcpxf3y";
     };
 
     propagatedBuildInputs = with python3Packages; [ colorama ];