diff --git a/tools/mapmerge2/requirements.txt b/tools/mapmerge2/requirements.txt
index d24cb40dcc..009f48f334 100644
--- a/tools/mapmerge2/requirements.txt
+++ b/tools/mapmerge2/requirements.txt
@@ -1,3 +1,3 @@
 pygit2==0.27.2
 bidict==0.13.1
-Pillow==6.2.0
+Pillow==9.0.1