diff --git a/requirements-dev.txt b/requirements-dev.txt
index d05951d..8ee9999 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -6,18 +6,14 @@ wheel
 black==22.1.0
 
 # Static analysis tools
-flake8==4.0.1
 flake8-annotations-coverage==0.0.5
 flake8-cognitive-complexity==0.1.0
 flake8-comprehensions==3.7.0
 flake8-docstrings==1.6.0
-isort==5.10.0
 flake8-isort==4.1.1
 flake8-json==21.7.0
 flake8-noqa==1.2.0
-flake8-polyfill==1.0.2
 flake8-use-fstring==1.3
-
 mypy==0.910
 pep8-naming==0.12.1
 safety==1.10.3
@@ -29,9 +25,8 @@ types-simplejson==3.17.1
 autopep8==1.6.0
 
 # Testing
-pytest==6.2.5
 pytest-cov==3.0.0  # Pytest code coverage support
-coverage[toml]==6.1.1 # pytest-cov dep. This is here to ensure that it includes TOML support for pyproject.toml configs
+# coverage[toml]==6.1.1 # pytest-cov dep. This is here to ensure that it includes TOML support for pyproject.toml configs
 
 # All of the normal requirements
 -r requirements.txt
diff --git a/requirements.txt b/requirements.txt
index 96210cb..e373522 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,10 +1,11 @@
-# Versions that installed under Python 3.9.7 Thu Nov  4 12:03:41 GMTST 2021
-argparse==1.4.0
+# Versions known to work under Python 3.9.2 on Debian bullseye
+# Fri 18 Mar 12:01:52 GMT 2022
+argparse  # Just take the 'system' version
 bottle==0.12.19
 enum34==1.1.10
-gevent==21.8.0
-jsonschema==4.2.0
+gevent==21.12.0
+jsonschema==4.4.0
+mysql-connector-python==8.0.28
 pyzmq==22.3.0
-requests==2.25.1
-simplejson==3.16.0
-mysql-connector-python==8.0.27
+requests==2.27.1
+simplejson==3.17.6