diff --git a/.github/workflows/nix-flake-check.yaml b/.github/workflows/nix-flake-check.yaml
index 0085ae2..ab6a41e 100644
--- a/.github/workflows/nix-flake-check.yaml
+++ b/.github/workflows/nix-flake-check.yaml
@@ -3,8 +3,7 @@ on:
   workflow_dispatch:
   pull_request:
   push:
-    branches: [master, main] 
-
+    branches: [master, main]
 jobs:
   nix-flake-check:
     runs-on: ubuntu-latest
diff --git a/leptos/treefmt.nix b/leptos/treefmt.nix
index a7b9ed0..21e6e3f 100644
--- a/leptos/treefmt.nix
+++ b/leptos/treefmt.nix
@@ -6,6 +6,7 @@ _: {
     nixfmt.enable = true;
     rustfmt.enable = true;
     taplo.enable = true;
+    yamlfmt.enable = true;
   };
 
   settings.formatter = {
diff --git a/nix/.github/workflows/nix-flake-check.yaml b/nix/.github/workflows/nix-flake-check.yaml
index 0085ae2..ab6a41e 100644
--- a/nix/.github/workflows/nix-flake-check.yaml
+++ b/nix/.github/workflows/nix-flake-check.yaml
@@ -3,8 +3,7 @@ on:
   workflow_dispatch:
   pull_request:
   push:
-    branches: [master, main] 
-
+    branches: [master, main]
 jobs:
   nix-flake-check:
     runs-on: ubuntu-latest
diff --git a/nix/treefmt.nix b/nix/treefmt.nix
index 4ad95fc..3a28f20 100644
--- a/nix/treefmt.nix
+++ b/nix/treefmt.nix
@@ -3,5 +3,6 @@ _: {
 
   programs = {
     nixfmt.enable = true;
+    yamlfmt.enable = true;
   };
 }
diff --git a/rust/.github/workflows/nix-flake-check.yaml b/rust/.github/workflows/nix-flake-check.yaml
index 0085ae2..ab6a41e 100644
--- a/rust/.github/workflows/nix-flake-check.yaml
+++ b/rust/.github/workflows/nix-flake-check.yaml
@@ -3,8 +3,7 @@ on:
   workflow_dispatch:
   pull_request:
   push:
-    branches: [master, main] 
-
+    branches: [master, main]
 jobs:
   nix-flake-check:
     runs-on: ubuntu-latest
diff --git a/rust/treefmt.nix b/rust/treefmt.nix
index 010e08c..e3edc7a 100644
--- a/rust/treefmt.nix
+++ b/rust/treefmt.nix
@@ -5,5 +5,6 @@ _: {
     nixfmt.enable = true;
     rustfmt.enable = true;
     taplo.enable = true;
+    yamlfmt.enable = true;
   };
 }
diff --git a/treefmt.nix b/treefmt.nix
index 4ad95fc..3a28f20 100644
--- a/treefmt.nix
+++ b/treefmt.nix
@@ -3,5 +3,6 @@ _: {
 
   programs = {
     nixfmt.enable = true;
+    yamlfmt.enable = true;
   };
 }