Pin exact version then ...

.travis.yml

@@ -15,7 +15,7 @@ python:
 install:
   - pip install --upgrade pip
   - pip install lxml
-  - pip install pyqt5<5.15
+  - pip install pyqt5==5.14.2
 # - pip install pytest-faulthandler
   - pip install PyVirtualDisplay
   - pip install pytest-xvfb