diff --git a/hooks.yaml b/hooks.yaml
deleted file mode 100644
index af53043e..00000000
--- a/hooks.yaml
+++ /dev/null
@@ -1,12 +0,0 @@
--   id: validate_config
-    name: Validate Pre-Commit Config
-    description: This validator validates a pre-commit hooks config file
-    entry: pre-commit-validate-config
-    language: python
-    files: ^\.pre-commit-config\.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/pre_commit/constants.py b/pre_commit/constants.py
index 3f81c802..8af49184 100644
--- a/pre_commit/constants.py
+++ b/pre_commit/constants.py
@@ -3,10 +3,7 @@ from __future__ import unicode_literals
 import pkg_resources
 
 CONFIG_FILE = '.pre-commit-config.yaml'
-
-# In 0.12.0, the default file was changed to be namespaced
 MANIFEST_FILE = '.pre-commit-hooks.yaml'
-MANIFEST_FILE_LEGACY = 'hooks.yaml'
 
 YAML_DUMP_KWARGS = {
     'default_flow_style': False,
diff --git a/pre_commit/manifest.py b/pre_commit/manifest.py
index c0c627fc..df288442 100644
--- a/pre_commit/manifest.py
+++ b/pre_commit/manifest.py
@@ -20,22 +20,7 @@ class Manifest(object):
 
     @cached_property
     def manifest_contents(self):
-        default_path = os.path.join(self.repo_path, C.MANIFEST_FILE)
-        legacy_path = os.path.join(self.repo_path, C.MANIFEST_FILE_LEGACY)
-        if os.path.exists(legacy_path) and not os.path.exists(default_path):
-            logger.warning(
-                '{} uses legacy {} to provide hooks.\n'
-                'In newer versions, this file is called {}\n'
-                'This will work in this version of pre-commit but will be '
-                'removed at a later time.\n'
-                'If `pre-commit autoupdate` does not silence this warning '
-                'consider making an issue / pull request.'.format(
-                    self.repo_url, C.MANIFEST_FILE_LEGACY, C.MANIFEST_FILE,
-                ),
-            )
-            return load_manifest(legacy_path)
-        else:
-            return load_manifest(default_path)
+        return load_manifest(os.path.join(self.repo_path, C.MANIFEST_FILE))
 
     @cached_property
     def hooks(self):
diff --git a/testing/fixtures.py b/testing/fixtures.py
index 4a3f1446..794720f2 100644
--- a/testing/fixtures.py
+++ b/testing/fixtures.py
@@ -79,11 +79,8 @@ def config_with_local_hooks():
     ))
 
 
-def make_config_from_repo(
-        repo_path, sha=None, hooks=None, check=True, legacy=False,
-):
-    filename = C.MANIFEST_FILE_LEGACY if legacy else C.MANIFEST_FILE
-    manifest = load_manifest(os.path.join(repo_path, filename))
+def make_config_from_repo(repo_path, sha=None, hooks=None, check=True):
+    manifest = load_manifest(os.path.join(repo_path, C.MANIFEST_FILE))
     config = OrderedDict((
         ('repo', repo_path),
         ('sha', sha or get_head_sha(repo_path)),
diff --git a/testing/resources/legacy_hooks_yaml_repo/hooks.yaml b/testing/resources/legacy_hooks_yaml_repo/hooks.yaml
deleted file mode 100644
index b2c347c1..00000000
--- a/testing/resources/legacy_hooks_yaml_repo/hooks.yaml
+++ /dev/null
@@ -1,5 +0,0 @@
--   id: system-hook-with-spaces
-    name: System hook with spaces
-    entry: bash -c 'echo "Hello World"'
-    language: system
-    files: \.sh$
diff --git a/tests/manifest_test.py b/tests/manifest_test.py
index ada004fc..ee1857c9 100644
--- a/tests/manifest_test.py
+++ b/tests/manifest_test.py
@@ -60,23 +60,6 @@ def test_hooks(manifest):
     }
 
 
-def test_legacy_manifest_warn(store, tempdir_factory, log_warning_mock):
-    path = make_repo(tempdir_factory, 'legacy_hooks_yaml_repo')
-    head_sha = get_head_sha(path)
-    repo_path = store.clone(path, head_sha)
-    Manifest(repo_path, path).manifest_contents
-
-    # Should have printed a warning
-    assert log_warning_mock.call_args_list[0][0][0] == (
-        '{} uses legacy hooks.yaml to provide hooks.\n'
-        'In newer versions, this file is called .pre-commit-hooks.yaml\n'
-        'This will work in this version of pre-commit but will be removed at '
-        'a later time.\n'
-        'If `pre-commit autoupdate` does not silence this warning consider '
-        'making an issue / pull request.'.format(path)
-    )
-
-
 def test_default_python_language_version(store, tempdir_factory):
     path = make_repo(tempdir_factory, 'python_hooks_repo')
     repo_path = store.clone(path, get_head_sha(path))
diff --git a/tests/meta_test.py b/tests/meta_test.py
deleted file mode 100644
index 64cea262..00000000
--- a/tests/meta_test.py
+++ /dev/null
@@ -1,9 +0,0 @@
-import io
-
-import pre_commit.constants as C
-
-
-def test_hooks_yaml_same_contents():
-    legacy_contents = io.open(C.MANIFEST_FILE_LEGACY).read()
-    contents = io.open(C.MANIFEST_FILE).read()
-    assert legacy_contents == contents
diff --git a/tests/repository_test.py b/tests/repository_test.py
index 9096161e..7c4009de 100644
--- a/tests/repository_test.py
+++ b/tests/repository_test.py
@@ -238,15 +238,6 @@ def test_system_hook_with_spaces(tempdir_factory, store):
     )
 
 
-@pytest.mark.integration
-def test_repo_with_legacy_hooks_yaml(tempdir_factory, store):
-    _test_hook_repo(
-        tempdir_factory, store, 'legacy_hooks_yaml_repo',
-        'system-hook-with-spaces', ['/dev/null'], b'Hello World\n',
-        config_kwargs={'legacy': True},
-    )
-
-
 @skipif_cant_run_swift
 @pytest.mark.integration
 def test_swift_hook(tempdir_factory, store):