diff --git a/pkgs/by-name/c2/c2ffi/package.nix b/pkgs/by-name/c2/c2ffi/package.nix
index 6389832770d0..375ee9b73fe3 100644
--- a/pkgs/by-name/c2/c2ffi/package.nix
+++ b/pkgs/by-name/c2/c2ffi/package.nix
@@ -13,13 +13,13 @@ in
 
 llvmPackages.stdenv.mkDerivation {
   pname = "c2ffi-${c2ffiBranch}";
-  version = "0-unstable-2024-04-20";
+  version = "0-unstable-2026-01-04";
 
   src = fetchFromGitHub {
     owner = "rpav";
     repo = "c2ffi";
-    rev = "0de81efb64acc82c08c5eee4a7108ddcb1b00d86";
-    hash = "sha256-q81Vxq/6h/5jgQ1Leq15klN/8L+UiavlxkARGo2SrJ0=";
+    rev = "d6eba0d91dfd58831e5c3133e868c62892595680";
+    hash = "sha256-9bRHsVdj0VOeJyEE9sdN4xKIRSrB05viAOoxjeqWW2Q=";
   };
 
   passthru.updateScript = unstableGitUpdater {