diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 0c2e096..bb187f2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,10 +14,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.6
+    - name: Set up Python 3.7
       uses: actions/setup-python@v2
       with:
-        python-version: 3.6
+        python-version: 3.7
     - name: Install tox
       run: pip install tox
     - name: Style check
diff --git a/Makefile b/Makefile
index 7163ef4..b0d3336 100644
--- a/Makefile
+++ b/Makefile
@@ -1,13 +1,13 @@
 .PHONY: style
 style:
-	black --target-version=py36 \
+	black --target-version=py37 \
 	      --line-length=120 \
 		  --skip-string-normalization \
 		  notifications testapp setup.py
 
 .PHONY: style_check
 style_check:
-	black --target-version=py36 \
+	black --target-version=py37 \
 	      --line-length=120 \
 		  --skip-string-normalization \
 		  --check \
diff --git a/tox.ini b/tox.ini
index e472987..791fadc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,6 +4,7 @@ envlist =
     py{39}-dj{22,30,32}
 
 [testenv]
+allowlist_externals = make
 deps =
     dj22: Django==2.2.*
     dj30: Django==3.0.*
@@ -14,7 +15,6 @@ extras =
 setenv =
     PYTHONPATH = {toxinidir}
     DJANGO_SETTINGS_MODULE = testapp.settings
-whitelist_externals = make
 pip_pre = True
 commands = make coverage TEST_ARGS='{posargs:tests}'
 
@@ -28,6 +28,6 @@ skip_install = true
 basepython = python3
 commands = make style_check
 deps =
-    black>=19.10b0
+    black==22.12.0
     flake8
 skip_install = true