diff --git a/flake.lock b/flake.lock
index 543778068..68d7d5794 100644
--- a/flake.lock
+++ b/flake.lock
@@ -36,11 +36,11 @@
     },
     "nixpkgs-for-circt": {
       "locked": {
-        "lastModified": 1728578844,
-        "narHash": "sha256-NszPaT3J8P6OOCuDU1YuNOBtwUMnCDj3xAgUxgS47ZI=",
+        "lastModified": 1734623593,
+        "narHash": "sha256-iA3kxtbds7yOc77oRBz2On9ZmOVI/1Pic+YQtYUyIsg=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "51666317f496aed4b86dda778f91b8d4a09b209b",
+        "rev": "8af52ff6ba2ed83047881e877718db3bb02fad85",
         "type": "github"
       },
       "original": {
diff --git a/nix/t1/dependencies/_sources/generated.json b/nix/t1/dependencies/_sources/generated.json
index 9b782e4b1..3230891eb 100644
--- a/nix/t1/dependencies/_sources/generated.json
+++ b/nix/t1/dependencies/_sources/generated.json
@@ -41,7 +41,7 @@
     },
     "chisel": {
         "cargoLocks": null,
-        "date": "2024-12-12",
+        "date": "2024-12-19",
         "extract": null,
         "name": "chisel",
         "passthru": null,
@@ -53,11 +53,11 @@
             "name": null,
             "owner": "chipsalliance",
             "repo": "chisel",
-            "rev": "33b6b2dc9c50b4db44f647df16297dc8461207bb",
-            "sha256": "sha256-RR5l7SaqaXRB7ox2XA+goQJtnywbGEEBTMTjCoSfTAc=",
+            "rev": "2d9c71954f4bacea49ebfb2effd2634833c9a562",
+            "sha256": "sha256-QSQKAUENDYt8VBGMSA0fOUvd51/Lsx/MGAIbm8NaLFg=",
             "type": "github"
         },
-        "version": "33b6b2dc9c50b4db44f647df16297dc8461207bb"
+        "version": "2d9c71954f4bacea49ebfb2effd2634833c9a562"
     },
     "chisel-interface": {
         "cargoLocks": null,
@@ -119,4 +119,4 @@
         },
         "version": "6f22826d2c8facb6bf0b41f4bea26a2225751220"
     }
-}
+}
\ No newline at end of file
diff --git a/nix/t1/dependencies/_sources/generated.nix b/nix/t1/dependencies/_sources/generated.nix
index 1cde8e55c..a6554640c 100644
--- a/nix/t1/dependencies/_sources/generated.nix
+++ b/nix/t1/dependencies/_sources/generated.nix
@@ -27,15 +27,15 @@
   };
   chisel = {
     pname = "chisel";
-    version = "33b6b2dc9c50b4db44f647df16297dc8461207bb";
+    version = "2d9c71954f4bacea49ebfb2effd2634833c9a562";
     src = fetchFromGitHub {
       owner = "chipsalliance";
       repo = "chisel";
-      rev = "33b6b2dc9c50b4db44f647df16297dc8461207bb";
+      rev = "2d9c71954f4bacea49ebfb2effd2634833c9a562";
       fetchSubmodules = false;
-      sha256 = "sha256-RR5l7SaqaXRB7ox2XA+goQJtnywbGEEBTMTjCoSfTAc=";
+      sha256 = "sha256-QSQKAUENDYt8VBGMSA0fOUvd51/Lsx/MGAIbm8NaLFg=";
     };
-    date = "2024-12-12";
+    date = "2024-12-19";
   };
   chisel-interface = {
     pname = "chisel-interface";