diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index c3f064a..c89ed61 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -42,4 +42,5 @@ repos:
     id: treefmt
     language: system
     name: treefmt
+    require_serial: true
   repo: local
diff --git a/nix/general/pre-commit-hooks.nix b/nix/general/pre-commit-hooks.nix
index 221e64d..c6e6f92 100644
--- a/nix/general/pre-commit-hooks.nix
+++ b/nix/general/pre-commit-hooks.nix
@@ -128,6 +128,7 @@ importingFlake: {
                 id = "treefmt";
                 name = "treefmt";
                 description = "Format *all* files";
+                require_serial = true;
 
                 entry = "treefmt";
                 language = "system";