diff --git a/requirements.txt b/requirements.txt
index 9339481..92620ae 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 .
 graphviz
+pillow
 pyyaml
 setuptools
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 09621bb..60b1dfb 100644
--- a/setup.py
+++ b/setup.py
@@ -23,6 +23,7 @@ setup(
     long_description_content_type='text/markdown',
     install_requires=[
         'pyyaml',
+        'pillow',
         'graphviz',
         ],
     license='GPLv3',