diff --git a/artiq-fast/pkgs/python-deps.nix b/artiq-fast/pkgs/python-deps.nix
index 0248c9b..2c1288f 100644
--- a/artiq-fast/pkgs/python-deps.nix
+++ b/artiq-fast/pkgs/python-deps.nix
@@ -71,14 +71,14 @@ rec {
 
   misoc = python3Packages.buildPythonPackage {
     pname = "misoc";
-    version = if misoc-new then "unstable-2021-09-10" else "unstable-2021-02-15";
+    version = if misoc-new then "unstable-2021-10-08" else "unstable-2021-02-15";
 
     src = if misoc-new
       then (fetchFromGitHub {
         owner = "m-labs";
         repo = "misoc";
-        rev = "855914deace34880c69589022c52a8921f431063";
-        sha256 = "sha256-CbeXsLTwwYBWb5cfrVVYkcQYV207gi9+CQhzfeZbXGc=";
+        rev = "87f77a739b587a6602b87ee1a94da509d36ba269";
+        sha256 = "sha256-+6tqAX+ek+jUU8m59vhhp4QS9UK+D2a6pLD1aFDIWX8=";
         fetchSubmodules = true;
       })
       else (fetchFromGitHub {