diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 1ed5cd6..5ea90d8 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,26 +1,27 @@
-- repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v2.1.0
-  hooks:
-    - id: trailing-whitespace
-    - id: end-of-file-fixer
-- repo: https://github.com/Lucas-C/pre-commit-hooks
-  rev: v1.1.6
-  hooks:
-    - id: forbid-tabs
-- repo: https://github.com/ambv/black
-  rev: stable
-  hooks:
-    - id: black
-- repo: https://github.com/pre-commit/mirrors-mypy
-  rev: "v0.700"
-  hooks:
-    - id: mypy
-      args:
-        - --ignore-missing-imports
-- repo: local
-  hooks:
-    - id: flake8
-      name: flake8
-      language: system
-      entry: poetry run flake8
-      types: [python]
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.1.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+  - repo: https://github.com/Lucas-C/pre-commit-hooks
+    rev: v1.1.6
+    hooks:
+      - id: forbid-tabs
+  - repo: https://github.com/ambv/black
+    rev: 20.8b1
+    hooks:
+      - id: black
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: "v0.700"
+    hooks:
+      - id: mypy
+        args:
+          - --ignore-missing-imports
+  - repo: local
+    hooks:
+      - id: flake8
+        name: flake8
+        language: system
+        entry: poetry run flake8
+        types: [python]