diff --git a/artiq-fast/pkgs/python-deps.nix b/artiq-fast/pkgs/python-deps.nix
index c9e0700..335ffef 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-2021-08-10";
+    version = "unstable-2021-09-14";
 
     src = fetchFromGitHub {
       owner = "m-labs";
       repo = "migen";
-      rev = "27dbf03edd75c32dc1706e2a1316950c3a8d452a";
-      sha256 = "0c7c7bbc05cb8xvxd612cxr7mvsxhaim0apfh7ax32wi9ykpl1ad";
+      rev = "a5bc262560238f93ceaad423820eb06843326274";
+      sha256 = "1akbzi6rkg9i06k7s914z9fxrcpbfk23vnx5qz31xz56hrl26rfz";
     };
 
     propagatedBuildInputs = with python3Packages; [ colorama ];
@@ -213,13 +213,13 @@ rec {
 
   migen-axi = python3Packages.buildPythonPackage {
     pname = "migen-axi";
-    version = "unstable-2021-08-23";
+    version = "unstable-2021-09-15";
 
     src = fetchFromGitHub {
       owner = "peteut";
       repo = "migen-axi";
-      rev = "1f94ee0fc847dad118020bfc8c6a8f26ed9958bd";
-      sha256 = "0bk4g8k7cng8na01p7h6llrfpjkmxsamyi1kacvk3n110l2kl93g";
+      rev = "9763505ee96acd7572280a2d1233721342dc7c3f";
+      sha256 = "15c7g05n183rka66fl1glzp6h7xjlpy1p6k8biry24dangsmxmvg";
     };
 
     nativeBuildInputs = [ python3Packages.pbr ];