diff --git a/nix/frama-ci.nix b/nix/frama-ci.nix
index 3e705a8ac1871c85d7680324718834ba71b0fd71..1baced43d4ca67783e6efe868c4e2d3a9799610f 100644
--- a/nix/frama-ci.nix
+++ b/nix/frama-ci.nix
@@ -5,8 +5,8 @@ let
     src = builtins.fetchGit {
             "url" = "https://bobot:${password}@git.frama-c.com/frama-c/Frama-CI.git";
             "name" = "Frama-CI";
-            "rev" = "01d423ae0e14b2d0d41e952d261aa859b2a3855e";
-            "ref" = "master";
+            "rev" = "5b4f8aca5b8b93a69d8e6f8904bdd457e4d0edd2";
+            "ref" = "feature/headers/2021";
     };
  in
  {