diff --git a/ecell/requirements.txt b/ecell/requirements.txt
index fe77a51e..30caff4c 100644
--- a/ecell/requirements.txt
+++ b/ecell/requirements.txt
@@ -1,4 +1,4 @@
 Django==2.2.8
-Pillow==6.2.1
+Pillow==9.3.0
 pytz==2019.3
 sqlparse==0.3.0
diff --git a/requirements.txt b/requirements.txt
index 72c45489..f37cebd7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 Django==2.2.8
-Pillow==6.2.1
+Pillow==9.3.0
 pytz==2019.3
 sqlparse==0.3.0
 whitenoise==4.1.2