diff --git a/requirements.txt b/requirements.txt
index 1ee39d7..a135d1e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 #
-# This file is autogenerated by pip-compile
+# This file is autogenerated by pip-compile with python 3.8
 # To update, run:
 #
 #    pip-compile --output-file=requirements.txt requirements.in
diff --git a/requirements_dev.in b/requirements_dev.in
index 3cc8a8b..9a7ad6b 100644
--- a/requirements_dev.in
+++ b/requirements_dev.in
@@ -6,6 +6,7 @@ ipdb
 # Test and lint packages
 pytest
 pytest-django
+flake8<4  # see https://github.com/tholo/pytest-flake8/issues/81
 pytest-flake8
 pytest-isort
 pytest-cov
diff --git a/requirements_dev.txt b/requirements_dev.txt
index bf1d2f0..13c8982 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,5 +1,5 @@
 #
-# This file is autogenerated by pip-compile
+# This file is autogenerated by pip-compile with python 3.8
 # To update, run:
 #
 #    pip-compile --output-file=requirements_dev.txt requirements_dev.in
@@ -18,12 +18,14 @@ decorator==5.1.0
     # via
     #   ipdb
     #   ipython
-django-extensions==3.1.3
-    # via -r requirements_dev.in
 django==3.2.8
     # via django-extensions
-flake8==4.0.1
-    # via pytest-flake8
+django-extensions==3.1.3
+    # via -r requirements_dev.in
+flake8==3.9.2
+    # via
+    #   -r requirements_dev.in
+    #   pytest-flake8
 iniconfig==1.1.1
     # via pytest
 ipdb==0.13.9
@@ -44,7 +46,7 @@ packaging==21.0
     # via pytest
 parso==0.8.2
     # via jedi
-pep517==0.11.1
+pep517==0.12.0
     # via pip-tools
 pexpect==4.8.0
     # via ipython
@@ -60,14 +62,20 @@ ptyprocess==0.7.0
     # via pexpect
 py==1.10.0
     # via pytest
-pycodestyle==2.8.0
+pycodestyle==2.7.0
     # via flake8
-pyflakes==2.4.0
+pyflakes==2.3.1
     # via flake8
 pygments==2.10.0
     # via ipython
 pyparsing==2.4.7
     # via packaging
+pytest==6.2.5
+    # via
+    #   -r requirements_dev.in
+    #   pytest-cov
+    #   pytest-django
+    #   pytest-flake8
 pytest-cov==3.0.0
     # via -r requirements_dev.in
 pytest-django==4.4.0
@@ -76,12 +84,6 @@ pytest-flake8==1.0.7
     # via -r requirements_dev.in
 pytest-isort==2.0.0
     # via -r requirements_dev.in
-pytest==6.2.5
-    # via
-    #   -r requirements_dev.in
-    #   pytest-cov
-    #   pytest-django
-    #   pytest-flake8
 pytz==2021.3
     # via django
 sqlparse==0.4.2