diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 22319fb..0b99ec8 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v3.3.0
+    rev: v4.0.1
     hooks:
       - id: trailing-whitespace
       - id: end-of-file-fixer
@@ -9,8 +9,8 @@ repos:
       - id: check-yaml
       - id: double-quote-string-fixer
 
-  - repo: https://github.com/ambv/black
-    rev: 20.8b1
+  - repo: https://github.com/psf/black
+    rev: 21.9b0
     hooks:
       - id: black
 
@@ -19,8 +19,8 @@ repos:
     hooks:
       - id: blackdoc
 
-  - repo: https://gitlab.com/pycqa/flake8
-    rev: 3.8.4
+  - repo: https://github.com/PyCQA/flake8
+    rev: 3.9.2
     hooks:
       - id: flake8
 
@@ -28,13 +28,13 @@ repos:
     rev: v2.2.0
     hooks:
       - id: seed-isort-config
-  - repo: https://github.com/pre-commit/mirrors-isort
-    rev: v5.6.4
+  - repo: https://github.com/PyCQA/isort
+    rev: 5.9.3
     hooks:
       - id: isort
 
-  - repo: https://github.com/prettier/pre-commit
-    rev: 57f39166b5a5a504d6808b87ab98d41ebf095b46
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: v2.4.1
     hooks:
       - id: prettier
 
diff --git a/xesmf/tests/test_oceanmodels.py b/xesmf/tests/test_oceanmodels.py
index c4d9079..74f3f96 100644
--- a/xesmf/tests/test_oceanmodels.py
+++ b/xesmf/tests/test_oceanmodels.py
@@ -81,7 +81,7 @@ def test_mom6like_to_5x5():
 
 @pytest.mark.testcases
 def test_mom6_to_1x1():
-    """ check regridding of MOM6 to regular lon/lat """
+    """check regridding of MOM6 to regular lon/lat"""
 
     dataurl = 'http://35.188.34.63:8080/thredds/dodsC/OM4p5/'
     mom6 = xr.open_dataset(