diff --git a/nix/t1/dependencies/_sources/generated.json b/nix/t1/dependencies/_sources/generated.json
index 3230891eb..383c859c2 100644
--- a/nix/t1/dependencies/_sources/generated.json
+++ b/nix/t1/dependencies/_sources/generated.json
@@ -41,7 +41,7 @@
     },
     "chisel": {
         "cargoLocks": null,
-        "date": "2024-12-19",
+        "date": "2024-12-23",
         "extract": null,
         "name": "chisel",
         "passthru": null,
@@ -53,11 +53,11 @@
             "name": null,
             "owner": "chipsalliance",
             "repo": "chisel",
-            "rev": "2d9c71954f4bacea49ebfb2effd2634833c9a562",
-            "sha256": "sha256-QSQKAUENDYt8VBGMSA0fOUvd51/Lsx/MGAIbm8NaLFg=",
+            "rev": "ef5a6237c35a3097426e3e27da62d8ee3ca4130e",
+            "sha256": "sha256-8vIeRjQ8ZRDdBKb9zoI1bt12BzK6tXncdlKieoBNgDo=",
             "type": "github"
         },
-        "version": "2d9c71954f4bacea49ebfb2effd2634833c9a562"
+        "version": "ef5a6237c35a3097426e3e27da62d8ee3ca4130e"
     },
     "chisel-interface": {
         "cargoLocks": null,
diff --git a/nix/t1/dependencies/_sources/generated.nix b/nix/t1/dependencies/_sources/generated.nix
index a6554640c..2beae4940 100644
--- a/nix/t1/dependencies/_sources/generated.nix
+++ b/nix/t1/dependencies/_sources/generated.nix
@@ -27,15 +27,15 @@
   };
   chisel = {
     pname = "chisel";
-    version = "2d9c71954f4bacea49ebfb2effd2634833c9a562";
+    version = "ef5a6237c35a3097426e3e27da62d8ee3ca4130e";
     src = fetchFromGitHub {
       owner = "chipsalliance";
       repo = "chisel";
-      rev = "2d9c71954f4bacea49ebfb2effd2634833c9a562";
+      rev = "ef5a6237c35a3097426e3e27da62d8ee3ca4130e";
       fetchSubmodules = false;
-      sha256 = "sha256-QSQKAUENDYt8VBGMSA0fOUvd51/Lsx/MGAIbm8NaLFg=";
+      sha256 = "sha256-8vIeRjQ8ZRDdBKb9zoI1bt12BzK6tXncdlKieoBNgDo=";
     };
-    date = "2024-12-19";
+    date = "2024-12-23";
   };
   chisel-interface = {
     pname = "chisel-interface";