diff --git a/nix/t1/_sources/generated.json b/nix/t1/_sources/generated.json
index 26e124b0b..ddd96858e 100644
--- a/nix/t1/_sources/generated.json
+++ b/nix/t1/_sources/generated.json
@@ -41,7 +41,7 @@
     },
     "chisel": {
         "cargoLocks": null,
-        "date": "2024-08-07",
+        "date": "2024-08-09",
         "extract": null,
         "name": "chisel",
         "passthru": null,
@@ -53,11 +53,11 @@
             "name": null,
             "owner": "chipsalliance",
             "repo": "chisel",
-            "rev": "8572c28dbcc54a2f20ade462028ed50a2f3209b8",
-            "sha256": "sha256-j76XKUrUCI1g7fgcnaPWgU9KcI2a8T1jOSezOdRpkKI=",
+            "rev": "3b64e70af4ffa02796bd174667b6d5f3c2a99197",
+            "sha256": "sha256-mU/+KmZDJtcZ++zWYeH5isbpZ/oeeuQyQ41IvGOoE6Y=",
             "type": "github"
         },
-        "version": "8572c28dbcc54a2f20ade462028ed50a2f3209b8"
+        "version": "3b64e70af4ffa02796bd174667b6d5f3c2a99197"
     },
     "chisel-interface": {
         "cargoLocks": null,
diff --git a/nix/t1/_sources/generated.nix b/nix/t1/_sources/generated.nix
index f74d22375..71fc799e6 100644
--- a/nix/t1/_sources/generated.nix
+++ b/nix/t1/_sources/generated.nix
@@ -27,15 +27,15 @@
   };
   chisel = {
     pname = "chisel";
-    version = "8572c28dbcc54a2f20ade462028ed50a2f3209b8";
+    version = "3b64e70af4ffa02796bd174667b6d5f3c2a99197";
     src = fetchFromGitHub {
       owner = "chipsalliance";
       repo = "chisel";
-      rev = "8572c28dbcc54a2f20ade462028ed50a2f3209b8";
+      rev = "3b64e70af4ffa02796bd174667b6d5f3c2a99197";
       fetchSubmodules = false;
-      sha256 = "sha256-j76XKUrUCI1g7fgcnaPWgU9KcI2a8T1jOSezOdRpkKI=";
+      sha256 = "sha256-mU/+KmZDJtcZ++zWYeH5isbpZ/oeeuQyQ41IvGOoE6Y=";
     };
-    date = "2024-08-07";
+    date = "2024-08-09";
   };
   chisel-interface = {
     pname = "chisel-interface";