diff --git a/Support/appveyor/requirements-dev.txt b/Support/appveyor/requirements-dev.txt
index 7d5c8f438a..7255ac16eb 100644
--- a/Support/appveyor/requirements-dev.txt
+++ b/Support/appveyor/requirements-dev.txt
@@ -1,6 +1,6 @@
 pytest==3.0.6
 requests==2.20.0
-Pillow==3.4.2
+Pillow==12.3.0
 # Need this for testing so we can stop there server, change when the required
 # get into a release.
 https://github.com/bottlepy/bottle/archive/41ed6965.zip