diff --git a/requirements/install.txt b/requirements/install.txt
index f57574be..9deca6a3 100644
--- a/requirements/install.txt
+++ b/requirements/install.txt
@@ -1,5 +1,5 @@
 # Runtime dependencies needed when using wxPython Phoenix
 numpy < 1.17 ; python_version <= '2.7'
 numpy ; python_version >= '3.0'
-pillow
+pillow ; python_version < '3.9'
 six