diff --git a/requirements_linux.txt b/requirements_linux.txt
index 96268f1c..bcafb0de 100644
--- a/requirements_linux.txt
+++ b/requirements_linux.txt
@@ -3,6 +3,7 @@ Cython==0.25.2
 Kivy==1.9.1
 Kivy-Garden==0.1.4
 packaging==16.8
+Pillow==5.2.0
 pygame==1.9.3
 pyparsing==2.2.0
 pyserial==3.3
diff --git a/requirements_osx.txt b/requirements_osx.txt
index cb99f99b..2ed32783 100644
--- a/requirements_osx.txt
+++ b/requirements_osx.txt
@@ -3,6 +3,7 @@ Cython==0.23
 Kivy==1.9.1
 Kivy-Garden==0.1.4
 packaging==16.8
+Pillow==5.2.0
 pygame==1.9.3
 pyparsing==2.2.0
 pyserial==3.3