diff --git a/requirements.txt b/requirements.txt
index d5b1034..c52fefc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 astropy==4.3.post1
 numpy==1.21.1
-pillow==8.3.1
+pillow==9.0.1
 pyserial==3.5
 scipy==1.7.1
 skyfield==1.39