diff --git a/third_party/lisp/cl-yacc.nix b/third_party/lisp/cl-yacc.nix
index b40d5d060..3542d1a05 100644
--- a/third_party/lisp/cl-yacc.nix
+++ b/third_party/lisp/cl-yacc.nix
@@ -4,8 +4,8 @@ let
   src = pkgs.fetchFromGitHub {
     owner = "jech";
     repo = "cl-yacc";
-    rev = "1334f5469251ffb3f8738a682dc8ee646cb26635";
-    sha256 = "16946pzf8vvadnyfayvj8rbh4zjzw90h0azz2qk1mxrvhh5wklib";
+    rev = "1812e05317dcab1e97905625c018c043d71f9187"; # 2023-01-08
+    sha256 = "1f974ysi7mlrksnqg63iwwxgbypkng4n240q29imkrz6m5pwdig7";
   };
 in
 depot.nix.buildLisp.library {