diff --git a/requirements-dev-gaesdk.txt b/requirements-dev-gaesdk.txt
index f2bfad1..dbb5d7f 100644
--- a/requirements-dev-gaesdk.txt
+++ b/requirements-dev-gaesdk.txt
@@ -5,7 +5,7 @@ Jinja2==2.6.0
 # that were used with release 2.5.2, except for babel.
 six==1.10.0
 Mako==0.4.1
-Babel==2.2
+Babel==2.9.1
 gaepytz==2011h
 # Test dependencies.
 pytest==2.9.1
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 648d555..7e42767 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -2,7 +2,7 @@
 WebOb==1.6.1
 Jinja2==2.8
 Mako==1.0.4
-Babel==2.3.4
+Babel==2.9.1
 pytz==2016.6.1
 # These are test dependencies
 pytest==2.9.1