--- a/setup.py
+++ b/setup.py
@@ -72,7 +72,6 @@ setup(
 #                      see: https://github.com/fontforge/fontforge/issues/2048
         'setuptools',
         'FontTools[ufo]',
-        'Flask',
         'absl-py',
         'glyphsLib',
         'PyGithub',