diff --git a/flake.lock b/flake.lock
index 4691e364b..ebe74afdb 100644
--- a/flake.lock
+++ b/flake.lock
@@ -36,11 +36,11 @@
     },
     "nixpkgs-for-circt": {
       "locked": {
-        "lastModified": 1722152050,
-        "narHash": "sha256-nHaFykbsYF6XM/YjsPD2mDIZuN4dBB/t/8qyIPDW8gM=",
+        "lastModified": 1722640603,
+        "narHash": "sha256-TcXjLVNd3VeH1qKPH335Tc4RbFDbZQX+d7rqnDUoRaY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "b7ab7da39366d578a537d0e9305bab2cdd2dba3b",
+        "rev": "81610abc161d4021b29199aa464d6a1a521e0cc9",
         "type": "github"
       },
       "original": {
diff --git a/nix/t1/_sources/generated.json b/nix/t1/_sources/generated.json
index 1ee4005d3..20f84a5e5 100644
--- a/nix/t1/_sources/generated.json
+++ b/nix/t1/_sources/generated.json
@@ -41,7 +41,7 @@
     },
     "chisel": {
         "cargoLocks": null,
-        "date": "2024-07-26",
+        "date": "2024-08-02",
         "extract": null,
         "name": "chisel",
         "passthru": null,
@@ -53,11 +53,11 @@
             "name": null,
             "owner": "chipsalliance",
             "repo": "chisel",
-            "rev": "96cc1b7cef892f2dcc65c9dbc85517542a77d412",
-            "sha256": "sha256-iccWL14hdJ02GbKuQ6PBnylpB61s4JuMw1T/M5ZHqUo=",
+            "rev": "557bc5064afb34124a39e9a3677f1e647306b3f6",
+            "sha256": "sha256-ZYk76WOd4OZrimiWRw6TV/QQ/zy3u9blwwqTAMRs5uk=",
             "type": "github"
         },
-        "version": "96cc1b7cef892f2dcc65c9dbc85517542a77d412"
+        "version": "557bc5064afb34124a39e9a3677f1e647306b3f6"
     },
     "chisel-interface": {
         "cargoLocks": null,
diff --git a/nix/t1/_sources/generated.nix b/nix/t1/_sources/generated.nix
index e5ae53b50..2f4406549 100644
--- a/nix/t1/_sources/generated.nix
+++ b/nix/t1/_sources/generated.nix
@@ -27,15 +27,15 @@
   };
   chisel = {
     pname = "chisel";
-    version = "96cc1b7cef892f2dcc65c9dbc85517542a77d412";
+    version = "557bc5064afb34124a39e9a3677f1e647306b3f6";
     src = fetchFromGitHub {
       owner = "chipsalliance";
       repo = "chisel";
-      rev = "96cc1b7cef892f2dcc65c9dbc85517542a77d412";
+      rev = "557bc5064afb34124a39e9a3677f1e647306b3f6";
       fetchSubmodules = false;
-      sha256 = "sha256-iccWL14hdJ02GbKuQ6PBnylpB61s4JuMw1T/M5ZHqUo=";
+      sha256 = "sha256-ZYk76WOd4OZrimiWRw6TV/QQ/zy3u9blwwqTAMRs5uk=";
     };
-    date = "2024-07-26";
+    date = "2024-08-02";
   };
   chisel-interface = {
     pname = "chisel-interface";