diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 80dcf6a..209a7e5 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,6 +1,6 @@
 repos:
 -   repo: https://github.com/psf/black
-    rev: stable
+    rev: 20.8b1
     hooks:
     - id: black
-      language_version: python3.7
+      language_version: python3
diff --git a/setup.py b/setup.py
index ee2dd46..1bf7b63 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@
         "black",
         "twine",
     ],
-    "test": ["matplotlib",],
+    "test": ["matplotlib"],
 }
 extras_require["complete"] = sorted(set(sum(extras_require.values(), [])))