diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 56aa236..1492e83 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,23 +1,23 @@
 repos:
   - repo: https://github.com/psf/black
-    rev: stable
+    rev: 21.12b0
     hooks:
       - id: black
 
-  - repo: https://gitlab.com/pycqa/flake8
-    rev: 3.7.8
+  - repo: https://github.com/PyCQA/flake8
+    rev: 4.0.1
     hooks:
       - id: flake8
 
-  - repo: https://github.com/pre-commit/mirrors-isort
-    rev: v4.3.21
+  - repo: https://github.com/PyCQA/isort
+    rev: 5.10.1
     hooks:
       - id: isort
         additional_dependencies: [toml]
         exclude: ^.*/?setup\.py$
 
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v2.3.0
+    rev: v4.0.1
     hooks:
       - id: trailing-whitespace
       - id: end-of-file-fixer
diff --git a/semver/patterns.py b/semver/patterns.py
index 63cce54..0a85faf 100644
--- a/semver/patterns.py
+++ b/semver/patterns.py
@@ -7,8 +7,8 @@
     r"([+-]?([0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*))?"
 )
 
-_COMPLETE_VERSION = r"v?(\d+)(?:\.(\d+))?(?:\.(\d+))?(?:\.(\d+))?{}(?:\+[^\s]+)?".format(
-    MODIFIERS
+_COMPLETE_VERSION = (
+    r"v?(\d+)(?:\.(\d+))?(?:\.(\d+))?(?:\.(\d+))?{}(?:\+[^\s]+)?".format(MODIFIERS)
 )
 
 COMPLETE_VERSION = re.compile("(?i)" + _COMPLETE_VERSION)