diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
index 9408e44d..ba4e8fde 100644
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@@ -1,2 +1,4 @@
+---
+
 github: asottile
 open_collective: pre-commit
diff --git a/.pre-commit-hooks.yaml b/.pre-commit-hooks.yaml
index ef269d13..905069ef 100644
--- a/.pre-commit-hooks.yaml
+++ b/.pre-commit-hooks.yaml
@@ -1,6 +1,8 @@
--   id: validate_manifest
-    name: Validate Pre-Commit Manifest
-    description: This validator validates a pre-commit hooks manifest file
-    entry: pre-commit-validate-manifest
-    language: python
-    files: ^(\.pre-commit-hooks\.yaml|hooks\.yaml)$
+---
+
+- id: validate_manifest
+  name: Validate Pre-Commit Manifest
+  description: This validator validates a pre-commit hooks manifest file
+  entry: pre-commit-validate-manifest
+  language: python
+  files: ^(\.pre-commit-hooks\.yaml|hooks\.yaml)$
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index e7256da1..21e0bf99 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -1,3 +1,5 @@
+---
+
 trigger:
   branches:
     include: [master, test-me-*]
@@ -13,46 +15,46 @@ resources:
       ref: refs/tags/v2.0.0
 
 jobs:
-- template: job--python-tox.yml@asottile
-  parameters:
-    toxenvs: [py37]
-    os: windows
-    pre_test:
-    - task: UseRubyVersion@0
-    - powershell: Write-Host "##vso[task.prependpath]$env:CONDA\Scripts"
-      displayName: Add conda to PATH
-    - powershell: |
-        Write-Host "##vso[task.prependpath]C:\Strawberry\perl\bin"
-        Write-Host "##vso[task.prependpath]C:\Strawberry\perl\site\bin"
-        Write-Host "##vso[task.prependpath]C:\Strawberry\c\bin"
-      displayName: Add strawberry perl to PATH
-- template: job--python-tox.yml@asottile
-  parameters:
-    toxenvs: [py37]
-    os: linux
-    name_postfix: _latest_git
-    pre_test:
-    - task: UseRubyVersion@0
-    - template: step--git-install.yml
-    - bash: |
-        testing/get-coursier.sh
-        echo '##vso[task.prependpath]/tmp/coursier'
-      displayName: install coursier
-    - bash: |
-        testing/get-swift.sh
-        echo '##vso[task.prependpath]/tmp/swift/usr/bin'
-      displayName: install swift
-- template: job--python-tox.yml@asottile
-  parameters:
-    toxenvs: [pypy3, py36, py37, py38, py39]
-    os: linux
-    pre_test:
-    - task: UseRubyVersion@0
-    - bash: |
-        testing/get-coursier.sh
-        echo '##vso[task.prependpath]/tmp/coursier'
-      displayName: install coursier
-    - bash: |
-        testing/get-swift.sh
-        echo '##vso[task.prependpath]/tmp/swift/usr/bin'
-      displayName: install swift
+  - template: job--python-tox.yml@asottile
+    parameters:
+      toxenvs: [py37]
+      os: windows
+      pre_test:
+        - task: UseRubyVersion@0
+        - powershell: Write-Host "##vso[task.prependpath]$env:CONDA\Scripts"
+          displayName: Add conda to PATH
+        - powershell: |
+            Write-Host "##vso[task.prependpath]C:\Strawberry\perl\bin"
+            Write-Host "##vso[task.prependpath]C:\Strawberry\perl\site\bin"
+            Write-Host "##vso[task.prependpath]C:\Strawberry\c\bin"
+          displayName: Add strawberry perl to PATH
+  - template: job--python-tox.yml@asottile
+    parameters:
+      toxenvs: [py37]
+      os: linux
+      name_postfix: _latest_git
+      pre_test:
+        - task: UseRubyVersion@0
+        - template: step--git-install.yml
+        - bash: |
+            testing/get-coursier.sh
+            echo '##vso[task.prependpath]/tmp/coursier'
+          displayName: install coursier
+        - bash: |
+            testing/get-swift.sh
+            echo '##vso[task.prependpath]/tmp/swift/usr/bin'
+          displayName: install swift
+  - template: job--python-tox.yml@asottile
+    parameters:
+      toxenvs: [pypy3, py36, py37, py38, py39]
+      os: linux
+      pre_test:
+        - task: UseRubyVersion@0
+        - bash: |
+            testing/get-coursier.sh
+            echo '##vso[task.prependpath]/tmp/coursier'
+          displayName: install coursier
+        - bash: |
+            testing/get-swift.sh
+            echo '##vso[task.prependpath]/tmp/swift/usr/bin'
+          displayName: install swift
diff --git a/pre_commit/resources/empty_template_environment.yml b/pre_commit/resources/empty_template_environment.yml
index 0f29f0c0..3beadce2 100644
--- a/pre_commit/resources/empty_template_environment.yml
+++ b/pre_commit/resources/empty_template_environment.yml
@@ -1,3 +1,5 @@
+---
+
 channels:
   - conda-forge
   - defaults
diff --git a/testing/resources/arbitrary_bytes_repo/.pre-commit-hooks.yaml b/testing/resources/arbitrary_bytes_repo/.pre-commit-hooks.yaml
index c2aec9b9..f1e17575 100644
--- a/testing/resources/arbitrary_bytes_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/arbitrary_bytes_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: hook
-    name: hook
-    entry: ./hook.sh
-    language: script
-    files: \.py$
+---
+
+- id: hook
+  name: hook
+  entry: ./hook.sh
+  language: script
+  files: \.py$
diff --git a/testing/resources/arg_per_line_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/arg_per_line_hooks_repo/.pre-commit-hooks.yaml
index 4c101db2..7d3a1c0f 100644
--- a/testing/resources/arg_per_line_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/arg_per_line_hooks_repo/.pre-commit-hooks.yaml
@@ -1,6 +1,8 @@
--   id: arg-per-line
-    name: Args per line hook
-    entry: bin/hook.sh
-    language: script
-    files: ''
-    args: [hello, world]
+---
+
+- id: arg-per-line
+  name: Args per line hook
+  entry: bin/hook.sh
+  language: script
+  files: ''
+  args: [hello, world]
diff --git a/testing/resources/conda_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/conda_hooks_repo/.pre-commit-hooks.yaml
index a0d274c2..6a5dd07d 100644
--- a/testing/resources/conda_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/conda_hooks_repo/.pre-commit-hooks.yaml
@@ -1,10 +1,13 @@
--   id: sys-exec
-    name: sys-exec
-    entry: python -c 'import os; import sys; print(sys.executable.split(os.path.sep)[-2]) if os.name == "nt" else print(sys.executable.split(os.path.sep)[-3])'
-    language: conda
-    files: \.py$
--   id: additional-deps
-    name: additional-deps
-    entry: python
-    language: conda
-    files: \.py$
+---
+
+- id: sys-exec
+  name: sys-exec
+  entry: python -c 'import os; import sys; print(sys.executable.split(os.path.sep)[-2]) if os.name == "nt" else print(sys.executable.split(os.path.sep)[-3])'
+  language: conda
+  files: \.py$
+
+- id: additional-deps
+  name: additional-deps
+  entry: python
+  language: conda
+  files: \.py$
diff --git a/testing/resources/conda_hooks_repo/environment.yml b/testing/resources/conda_hooks_repo/environment.yml
index e23c079f..32684bf1 100644
--- a/testing/resources/conda_hooks_repo/environment.yml
+++ b/testing/resources/conda_hooks_repo/environment.yml
@@ -1,3 +1,5 @@
+---
+
 channels:
   - conda-forge
   - defaults
diff --git a/testing/resources/coursier_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/coursier_hooks_repo/.pre-commit-hooks.yaml
index d4a143b3..31953903 100644
--- a/testing/resources/coursier_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/coursier_hooks_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: echo-java
-    name: echo-java
-    description: echo from java
-    entry: echo-java
-    language: coursier
+---
+
+- id: echo-java
+  name: echo-java
+  description: echo from java
+  entry: echo-java
+  language: coursier
diff --git a/testing/resources/docker_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/docker_hooks_repo/.pre-commit-hooks.yaml
index 52957396..4d5c3037 100644
--- a/testing/resources/docker_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/docker_hooks_repo/.pre-commit-hooks.yaml
@@ -1,17 +1,19 @@
--   id: docker-hook
-    name: Docker test hook
-    entry: echo
-    language: docker
-    files: \.txt$
+---
 
--   id: docker-hook-arg
-    name: Docker test hook
-    entry: echo -n
-    language: docker
-    files: \.txt$
+- id: docker-hook
+  name: Docker test hook
+  entry: echo
+  language: docker
+  files: \.txt$
 
--   id: docker-hook-failing
-    name: Docker test hook with nonzero exit code
-    entry: bork
-    language: docker
-    files: \.txt$
+- id: docker-hook-arg
+  name: Docker test hook
+  entry: echo -n
+  language: docker
+  files: \.txt$
+
+- id: docker-hook-failing
+  name: Docker test hook with nonzero exit code
+  entry: bork
+  language: docker
+  files: \.txt$
diff --git a/testing/resources/docker_image_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/docker_image_hooks_repo/.pre-commit-hooks.yaml
index 1b385aa1..e2b21bbb 100644
--- a/testing/resources/docker_image_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/docker_image_hooks_repo/.pre-commit-hooks.yaml
@@ -1,8 +1,11 @@
--   id: echo-entrypoint
-    name: echo (via --entrypoint)
-    language: docker_image
-    entry: --entrypoint echo cogniteev/echo
--   id: echo-cmd
-    name: echo (via cmd)
-    language: docker_image
-    entry: cogniteev/echo echo
+---
+
+- id: echo-entrypoint
+  name: echo (via --entrypoint)
+  language: docker_image
+  entry: --entrypoint echo cogniteev/echo
+
+- id: echo-cmd
+  name: echo (via cmd)
+  lguage: docker_image
+  entry: cogniteev/echo echo
diff --git a/testing/resources/dotnet_hooks_csproj_repo/.pre-commit-hooks.yaml b/testing/resources/dotnet_hooks_csproj_repo/.pre-commit-hooks.yaml
index d005a74c..3e7ede57 100644
--- a/testing/resources/dotnet_hooks_csproj_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/dotnet_hooks_csproj_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: dotnet example hook
-    name: dotnet example hook
-    entry: testeroni
-    language: dotnet
-    files: ''
+---
+
+- id: dotnet example hook
+  name: dotnet example hook
+  entry: testeroni
+  language: dotnet
+  files: ''
diff --git a/testing/resources/dotnet_hooks_sln_repo/.pre-commit-hooks.yaml b/testing/resources/dotnet_hooks_sln_repo/.pre-commit-hooks.yaml
index d005a74c..3e7ede57 100644
--- a/testing/resources/dotnet_hooks_sln_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/dotnet_hooks_sln_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: dotnet example hook
-    name: dotnet example hook
-    entry: testeroni
-    language: dotnet
-    files: ''
+---
+
+- id: dotnet example hook
+  name: dotnet example hook
+  entry: testeroni
+  language: dotnet
+  files: ''
diff --git a/testing/resources/exclude_types_repo/.pre-commit-hooks.yaml b/testing/resources/exclude_types_repo/.pre-commit-hooks.yaml
index ed8794fb..a15565a6 100644
--- a/testing/resources/exclude_types_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/exclude_types_repo/.pre-commit-hooks.yaml
@@ -1,6 +1,8 @@
--   id: python-files
-    name: Python files
-    entry: bin/hook.sh
-    language: script
-    types: [python]
-    exclude_types: [python3]
+---
+
+- id: python-files
+  name: Python files
+  entry: bin/hook.sh
+  language: script
+  types: [python]
+  exclude_types: [python3]
diff --git a/testing/resources/failing_hook_repo/.pre-commit-hooks.yaml b/testing/resources/failing_hook_repo/.pre-commit-hooks.yaml
index 118cc8b1..41ce1547 100644
--- a/testing/resources/failing_hook_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/failing_hook_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: failing_hook
-    name: Failing hook
-    entry: bin/hook.sh
-    language: script
-    files: .
+---
+
+- id: failing_hook
+  name: Failing hook
+  entry: bin/hook.sh
+  language: script
+  files: .
diff --git a/testing/resources/golang_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/golang_hooks_repo/.pre-commit-hooks.yaml
index 206733bb..4b0b5065 100644
--- a/testing/resources/golang_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/golang_hooks_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: golang-hook
-    name: golang example hook
-    entry: golang-hello-world
-    language: golang
-    files: ''
+---
+
+- id: golang-hook
+  name: golang example hook
+  entry: golang-hello-world
+  language: golang
+  files: ''
diff --git a/testing/resources/logfile_repo/.pre-commit-hooks.yaml b/testing/resources/logfile_repo/.pre-commit-hooks.yaml
index dcaba2e7..568a2e80 100644
--- a/testing/resources/logfile_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/logfile_repo/.pre-commit-hooks.yaml
@@ -1,6 +1,8 @@
--   id: logfile test hook
-    name: Logfile test hook
-    entry: bin/hook.sh
-    language: script
-    files: .
-    log_file: test.log
+---
+
+- id: logfile test hook
+  name: Logfile test hook
+  entry: bin/hook.sh
+  language: script
+  files: .
+  log_file: test.log
diff --git a/testing/resources/modified_file_returns_zero_repo/.pre-commit-hooks.yaml b/testing/resources/modified_file_returns_zero_repo/.pre-commit-hooks.yaml
index 8d79ef39..d9fd2d40 100644
--- a/testing/resources/modified_file_returns_zero_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/modified_file_returns_zero_repo/.pre-commit-hooks.yaml
@@ -1,15 +1,19 @@
--   id: bash_hook
-    name: Bash hook
-    entry: bin/hook.sh
-    language: script
-    files: 'foo.py'
--   id: bash_hook2
-    name: Bash hook
-    entry: bin/hook2.sh
-    language: script
-    files: ''
--   id: bash_hook3
-    name: Bash hook
-    entry: bin/hook3.sh
-    language: script
-    files: 'bar.py'
+---
+
+- id: bash_hook
+  name: Bash hook
+  entry: bin/hook.sh
+  language: script
+  files: 'foo.py'
+
+- id: bash_hook2
+  name: Bash hook
+  entry: bin/hook2.sh
+  language: script
+  files: ''
+
+- id: bash_hook3
+  name: Bash hook
+  entry: bin/hook3.sh
+  language: script
+  files: 'bar.py'
diff --git a/testing/resources/node_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/node_hooks_repo/.pre-commit-hooks.yaml
index 257698a4..d5a763ee 100644
--- a/testing/resources/node_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/node_hooks_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: foo
-    name: Foo
-    entry: foo
-    language: node
-    files: \.js$
+---
+
+- id: foo
+  name: Foo
+  entry: foo
+  language: node
+  files: \.js$
diff --git a/testing/resources/node_versioned_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/node_versioned_hooks_repo/.pre-commit-hooks.yaml
index e7ad5ea7..b24a3c45 100644
--- a/testing/resources/node_versioned_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/node_versioned_hooks_repo/.pre-commit-hooks.yaml
@@ -1,6 +1,8 @@
--   id: versioned-node-hook
-    name: Versioned node hook
-    entry: versioned-node-hook
-    language: node
-    language_version: 9.3.0
-    files: \.js$
+---
+
+- id: versioned-node-hook
+  name: Versioned node hook
+  entry: versioned-node-hook
+  language: node
+  language_version: 9.3.0
+  files: \.js$
diff --git a/testing/resources/not_found_exe/.pre-commit-hooks.yaml b/testing/resources/not_found_exe/.pre-commit-hooks.yaml
index 566f3c1f..490c00d2 100644
--- a/testing/resources/not_found_exe/.pre-commit-hooks.yaml
+++ b/testing/resources/not_found_exe/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: not-found-exe
-    name: Not found exe
-    entry: i-dont-exist-lol
-    language: system
-    files: ''
+---
+
+- id: not-found-exe
+  name: Not found exe
+  entry: i-dont-exist-lol
+  language: system
+  files: ''
diff --git a/testing/resources/perl_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/perl_hooks_repo/.pre-commit-hooks.yaml
index 11e6f6cd..fd6231c3 100644
--- a/testing/resources/perl_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/perl_hooks_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: perl-hook
-    name: perl example hook
-    entry: pre-commit-perl-hello
-    language: perl
-    files: ''
+---
+
+- id: perl-hook
+  name: perl example hook
+  entry: pre-commit-perl-hello
+  language: perl
+  files: ''
diff --git a/testing/resources/prints_cwd_repo/.pre-commit-hooks.yaml b/testing/resources/prints_cwd_repo/.pre-commit-hooks.yaml
index 70923792..84ee990e 100644
--- a/testing/resources/prints_cwd_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/prints_cwd_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: prints_cwd
-    name: Prints Cwd
-    entry: pwd
-    language: system
-    files: \.sh$
+---
+
+- id: prints_cwd
+  name: Prints Cwd
+  entry: pwd
+  language: system
+  files: \.sh$
diff --git a/testing/resources/python3_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/python3_hooks_repo/.pre-commit-hooks.yaml
index 2c237009..cd0d76e0 100644
--- a/testing/resources/python3_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/python3_hooks_repo/.pre-commit-hooks.yaml
@@ -1,6 +1,8 @@
--   id: python3-hook
-    name: Python 3 Hook
-    entry: python3-hook
-    language: python
-    language_version: python3
-    files: \.py$
+---
+
+- id: python3-hook
+  name: Python 3 Hook
+  entry: python3-hook
+  language: python
+  language_version: python3
+  files: \.py$
diff --git a/testing/resources/python_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/python_hooks_repo/.pre-commit-hooks.yaml
index e10ad50f..55352272 100644
--- a/testing/resources/python_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/python_hooks_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: foo
-    name: Foo
-    entry: foo
-    language: python
-    files: \.py$
+---
+
+- id: foo
+  name: Foo
+  entry: foo
+  language: python
+  files: \.py$
diff --git a/testing/resources/python_venv_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/python_venv_hooks_repo/.pre-commit-hooks.yaml
index a666ed87..c0cc861b 100644
--- a/testing/resources/python_venv_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/python_venv_hooks_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: foo
-    name: Foo
-    entry: foo
-    language: python_venv
-    files: \.py$
+---
+
+- id: foo
+  name: Foo
+  entry: foo
+  language: python_venv
+  files: \.py$
diff --git a/testing/resources/ruby_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/ruby_hooks_repo/.pre-commit-hooks.yaml
index aa15872f..615dacb9 100644
--- a/testing/resources/ruby_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/ruby_hooks_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: ruby_hook
-    name: Ruby Hook
-    entry: ruby_hook
-    language: ruby
-    files: \.rb$
+---
+
+- id: ruby_hook
+  name: Ruby Hook
+  entry: ruby_hook
+  language: ruby
+  files: \.rb$
diff --git a/testing/resources/ruby_versioned_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/ruby_versioned_hooks_repo/.pre-commit-hooks.yaml
index 63e1dd4c..e91d2391 100644
--- a/testing/resources/ruby_versioned_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/ruby_versioned_hooks_repo/.pre-commit-hooks.yaml
@@ -1,6 +1,8 @@
--   id: ruby_hook
-    name: Ruby Hook
-    entry: ruby_hook
-    language: ruby
-    language_version: 2.5.1
-    files: \.rb$
+---
+
+- id: ruby_hook
+  name: Ruby Hook
+  entry: ruby_hook
+  language: ruby
+  language_version: 2.5.1
+  files: \.rb$
diff --git a/testing/resources/rust_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/rust_hooks_repo/.pre-commit-hooks.yaml
index df1269ff..acfc30d6 100644
--- a/testing/resources/rust_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/rust_hooks_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: rust-hook
-    name: rust example hook
-    entry: rust-hello-world
-    language: rust
-    files: ''
+---
+
+- id: rust-hook
+  name: rust example hook
+  entry: rust-hello-world
+  language: rust
+  files: ''
diff --git a/testing/resources/script_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/script_hooks_repo/.pre-commit-hooks.yaml
index 21cad4a3..da6283b4 100644
--- a/testing/resources/script_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/script_hooks_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: bash_hook
-    name: Bash hook
-    entry: bin/hook.sh
-    language: script
-    files: ''
+---
+
+- id: bash_hook
+  name: Bash hook
+  entry: bin/hook.sh
+  language: script
+  files: ''
diff --git a/testing/resources/stdout_stderr_repo/.pre-commit-hooks.yaml b/testing/resources/stdout_stderr_repo/.pre-commit-hooks.yaml
index 6800d259..53586119 100644
--- a/testing/resources/stdout_stderr_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/stdout_stderr_repo/.pre-commit-hooks.yaml
@@ -1,8 +1,10 @@
--   id: stdout-stderr
-    name: stdout-stderr
-    language: script
-    entry: ./stdout-stderr-entry
--   id: tty-check
-    name: tty-check
-    language: script
-    entry: ./tty-check-entry
+---
+
+- id: stdout-stderr
+  name: stdout-stderr
+  language: script
+  entry: ./stdout-stderr-entry
+- id: tty-check
+  name: tty-check
+  language: script
+  entry: ./tty-check-entry
diff --git a/testing/resources/swift_hooks_repo/.pre-commit-hooks.yaml b/testing/resources/swift_hooks_repo/.pre-commit-hooks.yaml
index c08df87d..01f9733e 100644
--- a/testing/resources/swift_hooks_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/swift_hooks_repo/.pre-commit-hooks.yaml
@@ -1,6 +1,8 @@
--   id: swift-hooks-repo
-    name: Swift hooks repo example
-    description: Runs the hello world app generated by swift package init --type executable (binary called swift_hooks_repo here)
-    entry: swift_hooks_repo
-    language: swift
-    files: \.(swift)$
+---
+
+- id: swift-hooks-repo
+  name: Swift hooks repo example
+  description: Runs the hello world app generated by swift package init --type executable (binary called swift_hooks_repo here)
+  entry: swift_hooks_repo
+  language: swift
+  files: \.(swift)$
diff --git a/testing/resources/system_hook_with_spaces_repo/.pre-commit-hooks.yaml b/testing/resources/system_hook_with_spaces_repo/.pre-commit-hooks.yaml
index b2c347c1..03e6f07a 100644
--- a/testing/resources/system_hook_with_spaces_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/system_hook_with_spaces_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: system-hook-with-spaces
-    name: System hook with spaces
-    entry: bash -c 'echo "Hello World"'
-    language: system
-    files: \.sh$
+---
+
+- id: system-hook-with-spaces
+  name: System hook with spaces
+  entry: bash -c 'echo "Hello World"'
+  language: system
+  files: \.sh$
diff --git a/testing/resources/types_or_repo/.pre-commit-hooks.yaml b/testing/resources/types_or_repo/.pre-commit-hooks.yaml
index a4ea920d..e97690cc 100644
--- a/testing/resources/types_or_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/types_or_repo/.pre-commit-hooks.yaml
@@ -1,6 +1,8 @@
--   id: python-cython-files
-    name: Python and Cython files
-    entry: bin/hook.sh
-    language: script
-    types: [file]
-    types_or: [python, cython]
+---
+
+- id: python-cython-files
+  name: Python and Cython files
+  entry: bin/hook.sh
+  language: script
+  types: [file]
+  types_or: [python, cython]
diff --git a/testing/resources/types_repo/.pre-commit-hooks.yaml b/testing/resources/types_repo/.pre-commit-hooks.yaml
index 2e5e4a6c..1bc756cd 100644
--- a/testing/resources/types_repo/.pre-commit-hooks.yaml
+++ b/testing/resources/types_repo/.pre-commit-hooks.yaml
@@ -1,5 +1,7 @@
--   id: python-files
-    name: Python files
-    entry: bin/hook.sh
-    language: script
-    types: [python]
+---
+
+- id: python-files
+  name: Python files
+  entry: bin/hook.sh
+  language: script
+  types: [python]