diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index a487a118..aea16dd6 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -30,16 +30,11 @@ jobs:
         python -m pip install --upgrade pip
         pip install pytest
         pip install -r requirements.txt
-        python setup.py install
-    - name: Lint with flake8
-      run: |
-        pip install flake8
         pip install xmltodict==0.12.0
         pip install pytest==7.0.1
         pip install coverage==6.3.2
         pip install py==1.11.0
-        # stop the build if there are Python syntax errors or undefined names
-        flake8 json2xml/ --exit-zero
+        python setup.py install
     - name: Unit tests
       run: |
         coverage run -m pytest
diff --git a/README.rst b/README.rst
index 41b62178..a0fc5971 100644
--- a/README.rst
+++ b/README.rst
@@ -197,9 +197,10 @@ This is provided by pytest, which is straight forward.
 
  .. code-block:: bash
 
-    python3.8 -mvenv venv
-    source venv/bin/activate
-    python setup.py test
+    virtualenv venv -p $(which python3.9)
+    pip install -r requirements-dev.txt
+    python setup.py install
+    pytest
 
 
 Credits
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 00000000..3f7b99d3
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1,5 @@
+-r requirements.txt
+xmltodict==0.12.0
+pytest==7.0.1
+coverage==6.3.2
+py==1.11.0
diff --git a/requirements.in b/requirements.in
index cc9937be..27964c51 100644
--- a/requirements.in
+++ b/requirements.in
@@ -1,4 +1,3 @@
 requests>=2.20.0
 defusedxml==0.7.1
-xmltodict
 
diff --git a/requirements.txt b/requirements.txt
index 3f5a2a6b..8fc19336 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,5 +16,3 @@ requests==2.26.0
     # via -r requirements.in
 urllib3==1.26.7
     # via requests
-xmltodict==0.12.0
-    # via -r requirements.in