diff --git a/script/gen_requirements_all.py b/script/gen_requirements_all.py
index f5b0a271d84..2b7721d2d35 100755
--- a/script/gen_requirements_all.py
+++ b/script/gen_requirements_all.py
@@ -28,6 +28,11 @@ IGNORE_PACKAGES = (
     'homeassistant.components.recorder.models',
 )
 
+IGNORE_PIN = ('colorlog>2.1,<3', 'keyring>=9.3,<10.0', 'urllib3')
+
+URL_PIN = ('https://home-assistant.io/developers/code_review_platform/'
+           '#1-requirements')
+
 
 def explore_module(package, explore_children):
     """Explore the modules."""
@@ -80,6 +85,10 @@ def gather_modules():
             continue
 
         for req in module.REQUIREMENTS:
+            if req.partition('==')[1] == '' and req not in IGNORE_PIN:
+                errors.append(
+                    "{}[Please pin requirement {}, see {}]".format(
+                        package, req, URL_PIN))
             reqs.setdefault(req, []).append(package)
 
     for key in reqs: