diff --git a/.python-version b/.python-version
new file mode 100644
index 0000000..bd28b9c
--- /dev/null
+++ b/.python-version
@@ -0,0 +1 @@
+3.9
diff --git a/Pipfile b/Pipfile
index edab3f1..c652c27 100644
--- a/Pipfile
+++ b/Pipfile
@@ -1,18 +1,18 @@
 [[source]]
 url = "https://pypi.org/simple"
 verify_ssl = true
 name = "pypi"
 
 [requires]
-python_version = "3.7"
+python_version = "3.9"
 
 [dev-packages]
 pytest = "*"
 pytest-cov = "*"
 fakeredis = "*"
 
 [packages]
 pywikibot = "*"
 flask = "*"
 redis = "*"
 mwparserfromhell = "*"
diff --git a/conf/Dockerfile.web b/conf/Dockerfile.web
index 0c337db..ca5bd8e 100644
--- a/conf/Dockerfile.web
+++ b/conf/Dockerfile.web
@@ -1,5 +1,5 @@
-FROM python:3.7
+FROM python:3.9
 WORKDIR /code
 ADD requirements.txt /code/
 RUN pip install -r requirements.txt
 ADD . /code
diff --git a/tox.ini b/tox.ini
index 0443b5a..3b3318f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,56 +1,56 @@
 [tox]
-envlist = black,flake8,bashate,isort,py37
+envlist = black,flake8,bashate,isort,py39
 skipsdist=true
 
 [testenv]
 setenv =
     PYWIKIBOT_NO_USER_CONFIG = 1
 # Since pywikibot fallback to the user home directory:
     HOME={envdir}
     PYTHONPATH={toxinidir}/integraality
 deps =
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/requirements-dev.txt
 commands = pytest --cov --cov-config=setup.cfg -vvv --showlocals {posargs}
 whitelist_externals =
     bash
 
 [testenv:flake8]
 deps =
     flake8==3.9.0
 commands = flake8
 
 [testenv:bashate]
 deps = bashate==2.0.0
 allowlist_externals = bash
 commands =
     bash -c "grep --recursive --binary-files=without-match \
         --files-with-match '^.!.*\(ba\)\?sh$' \
         --exclude-dir .tox \
         --exclude-dir .git \
         --exclude-dir .venv \
         --exclude-dir deploy \
         {toxinidir} | xargs bashate --error . --verbose --ignore=E006"
 
 [testenv:isort]
 deps = isort==5.11.2
 allowlist_externals = bash
 commands =
     bash -c "find {toxinidir} \
         -type d \
             \( \
               -path {toxinidir}/.git -o \
               -path {toxinidir}/.tox -o \
               -path {toxinidir}/deploy -o \
               -path {toxinidir}/.venv  \
             \) -prune -o \
         -name '*.py' \
         -print | xargs isort {posargs:--check-only} --verbose"
 
 
 [flake8]
 exclude = .venv,.tox,.git,deploy
 
 [testenv:black]
 deps = black
 commands = black .