diff --git a/Makefile b/Makefile
index e517770..85918d2 100644
--- a/Makefile
+++ b/Makefile
@@ -28,10 +28,8 @@ help:
 
 .venv:
 	$(PYTHON3) -m venv .venv
-	$(PIP) install -U pip
-	$(PIP) install wheel
-	$(PIP) install pyflakes pylint yamllint pytest collective.checkdocs twine
-	$(PIP) install molecule[ansible]
+	$(PIP) install -U pip wheel
+	$(PIP) install -r requirements.txt
 	$(PIP) install -e .
 
 init: .venv
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..0035ef6
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,8 @@
+# Requirements for development.
+ansible
+pyflakes
+pylint
+yamllint
+pytest
+collective.checkdocs
+twine
diff --git a/setup.py b/setup.py
index f23ba38..3e43a62 100644
--- a/setup.py
+++ b/setup.py
@@ -27,7 +27,7 @@ def find_version():
     },
     install_requires=[
         # molecule plugins are not allowed to mention Ansible as a direct dependency
-        'molecule>=3.2.0',
+        'molecule>=3.2.0,<4.0',
         'pyyaml',
         'proxmoxer>=1.3.1',
     ],