diff --git a/flake.lock b/flake.lock
index c11f190f1..0e20292a0 100644
--- a/flake.lock
+++ b/flake.lock
@@ -36,11 +36,11 @@
     },
     "nixpkgs-for-circt": {
       "locked": {
-        "lastModified": 1723274555,
-        "narHash": "sha256-gDCMNBju0BwYHUPp6RVVnqE0VnbXl53VMk21OT9fkFw=",
+        "lastModified": 1724306539,
+        "narHash": "sha256-9jF5qr44cnvWoXhE0cr114GHT5Adav3q/DKJ6n9tor8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "33c40979a7ccf487d6c0e1a420ecf8e4ac2b676e",
+        "rev": "6c31eb9b990446880000e3297f69f4fdee5b69d7",
         "type": "github"
       },
       "original": {
diff --git a/nix/t1/_sources/generated.json b/nix/t1/_sources/generated.json
index 0dd666ee5..995bc5555 100644
--- a/nix/t1/_sources/generated.json
+++ b/nix/t1/_sources/generated.json
@@ -41,7 +41,7 @@
     },
     "chisel": {
         "cargoLocks": null,
-        "date": "2024-08-12",
+        "date": "2024-08-21",
         "extract": null,
         "name": "chisel",
         "passthru": null,
@@ -53,11 +53,11 @@
             "name": null,
             "owner": "chipsalliance",
             "repo": "chisel",
-            "rev": "1d50b782cab542ca8c1822a59f25033e5adfc93f",
-            "sha256": "sha256-Yg8gCwOIYoBb/pehHVBJIzFIXp77qB+D5n4XQaceAtg=",
+            "rev": "5c129120ba06229e6c5d28c8120b35166770fa09",
+            "sha256": "sha256-6BQKesJGI93xG7CxblM1YKAv6eN2U+EEcwlGsgMUTeI=",
             "type": "github"
         },
-        "version": "1d50b782cab542ca8c1822a59f25033e5adfc93f"
+        "version": "5c129120ba06229e6c5d28c8120b35166770fa09"
     },
     "chisel-interface": {
         "cargoLocks": null,
diff --git a/nix/t1/_sources/generated.nix b/nix/t1/_sources/generated.nix
index abe12d31e..9efccad75 100644
--- a/nix/t1/_sources/generated.nix
+++ b/nix/t1/_sources/generated.nix
@@ -27,15 +27,15 @@
   };
   chisel = {
     pname = "chisel";
-    version = "1d50b782cab542ca8c1822a59f25033e5adfc93f";
+    version = "5c129120ba06229e6c5d28c8120b35166770fa09";
     src = fetchFromGitHub {
       owner = "chipsalliance";
       repo = "chisel";
-      rev = "1d50b782cab542ca8c1822a59f25033e5adfc93f";
+      rev = "5c129120ba06229e6c5d28c8120b35166770fa09";
       fetchSubmodules = false;
-      sha256 = "sha256-Yg8gCwOIYoBb/pehHVBJIzFIXp77qB+D5n4XQaceAtg=";
+      sha256 = "sha256-6BQKesJGI93xG7CxblM1YKAv6eN2U+EEcwlGsgMUTeI=";
     };
-    date = "2024-08-12";
+    date = "2024-08-21";
   };
   chisel-interface = {
     pname = "chisel-interface";