diff --git a/smiler_tools/setup.py b/smiler_tools/setup.py
index ecb52ca..8864b06 100644
--- a/smiler_tools/setup.py
+++ b/smiler_tools/setup.py
@@ -16,7 +16,7 @@
     install_requires=[
         'numpy',
         'scipy==1.2.1',
-        'pillow==5.1',
+        'pillow==9.3.0',
     ],
     classifiers=(
         "Programming Language :: Python :: 3",