diff --git a/appengine/flexible/scipy/requirements.txt b/appengine/flexible/scipy/requirements.txt
index c1ec0f008fe..e76f95c90a7 100644
--- a/appengine/flexible/scipy/requirements.txt
+++ b/appengine/flexible/scipy/requirements.txt
@@ -1,4 +1,4 @@
 Flask==0.11.1
 gunicorn==19.6.0
 scipy==0.18.1
-Pillow==3.4.1
+Pillow==3.4.2
diff --git a/testing/requirements-dev.txt b/testing/requirements-dev.txt
index d7e806e4d80..2ebcdb3c674 100644
--- a/testing/requirements-dev.txt
+++ b/testing/requirements-dev.txt
@@ -37,7 +37,7 @@ mysql-python==1.2.5; python_version == '2.7'
 mysqlclient==1.3.9
 numpy==1.11.2
 oauth2client==4.0.0
-Pillow==3.4.1
+Pillow==3.4.2
 pyasn1-modules==0.0.8
 pyasn1==0.1.9
 PyAudio==0.2.9
diff --git a/vision/api/face_detection/requirements.txt b/vision/api/face_detection/requirements.txt
index 82b0598be14..23114d1ff44 100644
--- a/vision/api/face_detection/requirements.txt
+++ b/vision/api/face_detection/requirements.txt
@@ -1,2 +1,2 @@
 google-api-python-client==1.5.4
-Pillow==3.4.1
+Pillow==3.4.2