diff --git a/src/rattler_build_conda_compat/modify_recipe.py b/src/rattler_build_conda_compat/modify_recipe.py
index 2c2ee5b..ffbeecb 100644
--- a/src/rattler_build_conda_compat/modify_recipe.py
+++ b/src/rattler_build_conda_compat/modify_recipe.py
@@ -21,7 +21,7 @@
 yaml = YAML()
 yaml.preserve_quotes = True
 yaml.width = 4096
-yaml.indent(mapping=2, sequence=2, offset=0)
+yaml.indent(mapping=2, sequence=4, offset=2)
 
 
 def _update_build_number_in_context(recipe: dict[str, Any], new_build_number: int) -> bool:
diff --git a/tests/data/build_number/test_2/expected.yaml b/tests/data/build_number/test_2/expected.yaml
index 8503020..3095c27 100644
--- a/tests/data/build_number/test_2/expected.yaml
+++ b/tests/data/build_number/test_2/expected.yaml
@@ -8,4 +8,4 @@ build:
   number: 0
 
 source:
-- url: foo
+  - url: foo
diff --git a/tests/data/version/test_2/expected.yaml b/tests/data/version/test_2/expected.yaml
index b146d59..e9a70d0 100644
--- a/tests/data/version/test_2/expected.yaml
+++ b/tests/data/version/test_2/expected.yaml
@@ -8,8 +8,8 @@ package:
   version: ${{ version }}
 
 source:
-# please update the version here.
-- if: target_platform == linux-64
-  then:
-    url: https://github.com/xtensor-stack/xtensor/archive/${{ version }}.tar.gz
-    sha256: 32d5d9fd23998c57e746c375a544edf544b74f0a18ad6bc3c38cbba968d5e6c7
+  # please update the version here.
+  - if: target_platform == linux-64
+    then:
+      url: https://github.com/xtensor-stack/xtensor/archive/${{ version }}.tar.gz
+      sha256: 32d5d9fd23998c57e746c375a544edf544b74f0a18ad6bc3c38cbba968d5e6c7
diff --git a/tests/data/version/test_2/recipe.yaml b/tests/data/version/test_2/recipe.yaml
index 5f12e9d..6de44d5 100644
--- a/tests/data/version/test_2/recipe.yaml
+++ b/tests/data/version/test_2/recipe.yaml
@@ -8,8 +8,8 @@ package:
   version: ${{ version }}
 
 source:
-# please update the version here.
-- if: target_platform == linux-64
-  then:
-    url: https://github.com/xtensor-stack/xtensor/archive/${{ version }}.tar.gz
-    sha256: 0811011e448628f0dfa6ebb5e3f76dc7bf6a15ee65ea9c5a277b12ea976d35bc
+  # please update the version here.
+  - if: target_platform == linux-64
+    then:
+      url: https://github.com/xtensor-stack/xtensor/archive/${{ version }}.tar.gz
+      sha256: 0811011e448628f0dfa6ebb5e3f76dc7bf6a15ee65ea9c5a277b12ea976d35bc
diff --git a/tests/data/version/test_4/expected.yaml b/tests/data/version/test_4/expected.yaml
index a4c18d8..2cb6a9c 100644
--- a/tests/data/version/test_4/expected.yaml
+++ b/tests/data/version/test_4/expected.yaml
@@ -9,6 +9,6 @@ package:
 
 source:
   url:
-  - ${{ cran_mirror }}/src/contrib/systemfit_${{ version }}.tar.gz
-  - ${{ cran_mirror }}/src/contrib/Archive/systemfit/systemfit_${{ version }}.tar.gz
+    - ${{ cran_mirror }}/src/contrib/systemfit_${{ version }}.tar.gz
+    - ${{ cran_mirror }}/src/contrib/Archive/systemfit/systemfit_${{ version }}.tar.gz
   sha256: 5994fbb81f1678325862414f58328cdc2c46d47efa1f23218e9416a4da431ce2