diff --git a/appengine/standard/blobstore/blobreader/requirements-test.txt b/appengine/standard/blobstore/blobreader/requirements-test.txt
index 9143d7bee07..fb2b3906c1d 100644
--- a/appengine/standard/blobstore/blobreader/requirements-test.txt
+++ b/appengine/standard/blobstore/blobreader/requirements-test.txt
@@ -1,2 +1,2 @@
 pytest==4.6.11; python_version < '3.0'
-WebTest==2.0.35
+WebTest==2.0.35; python_version < '3.0'
diff --git a/appengine/standard/blobstore/gcs/requirements-test.txt b/appengine/standard/blobstore/gcs/requirements-test.txt
index 9143d7bee07..fb2b3906c1d 100644
--- a/appengine/standard/blobstore/gcs/requirements-test.txt
+++ b/appengine/standard/blobstore/gcs/requirements-test.txt
@@ -1,2 +1,2 @@
 pytest==4.6.11; python_version < '3.0'
-WebTest==2.0.35
+WebTest==2.0.35; python_version < '3.0'
diff --git a/appengine/standard/firebase/firetactoe/requirements-test.txt b/appengine/standard/firebase/firetactoe/requirements-test.txt
index 58c9c96e1a3..0622c027ae3 100644
--- a/appengine/standard/firebase/firetactoe/requirements-test.txt
+++ b/appengine/standard/firebase/firetactoe/requirements-test.txt
@@ -1,3 +1,3 @@
 pytest==4.6.11; python_version < '3.0'
-WebTest==2.0.35
+WebTest==2.0.35; python_version < '3.0'
 mock==3.0.5; python_version < "3"
diff --git a/appengine/standard/iap/requirements-test.txt b/appengine/standard/iap/requirements-test.txt
index 9143d7bee07..fb2b3906c1d 100644
--- a/appengine/standard/iap/requirements-test.txt
+++ b/appengine/standard/iap/requirements-test.txt
@@ -1,2 +1,2 @@
 pytest==4.6.11; python_version < '3.0'
-WebTest==2.0.35
+WebTest==2.0.35; python_version < '3.0'
diff --git a/appengine/standard/mailgun/requirements-test.txt b/appengine/standard/mailgun/requirements-test.txt
index a0741250b6c..31a0232c48e 100644
--- a/appengine/standard/mailgun/requirements-test.txt
+++ b/appengine/standard/mailgun/requirements-test.txt
@@ -1,4 +1,4 @@
 pytest==4.6.11; python_version < '3.0'
 google-api-python-client==1.12.8; python_version < '3.0'
 mock==3.0.5; python_version < '3.0'
-WebTest==2.0.35
+WebTest==2.0.35; python_version < '3.0'
diff --git a/appengine/standard/migration/incoming/requirements-test.txt b/appengine/standard/migration/incoming/requirements-test.txt
index 84a992142d2..fb2b3906c1d 100644
--- a/appengine/standard/migration/incoming/requirements-test.txt
+++ b/appengine/standard/migration/incoming/requirements-test.txt
@@ -1,2 +1,2 @@
 pytest==4.6.11; python_version < '3.0'
-webtest==2.0.35
+WebTest==2.0.35; python_version < '3.0'
diff --git a/appengine/standard/sendgrid/requirements-test.txt b/appengine/standard/sendgrid/requirements-test.txt
index 774acfbd72d..a69fc8cbd2d 100644
--- a/appengine/standard/sendgrid/requirements-test.txt
+++ b/appengine/standard/sendgrid/requirements-test.txt
@@ -1,3 +1,3 @@
 pytest==4.6.11; python_version < '3.0'
 mock==3.0.5; python_version < '3.0'
-WebTest==2.0.35
+WebTest==2.0.35; python_version < '3.0'
diff --git a/appengine/standard/storage/api-client/requirements-test.txt b/appengine/standard/storage/api-client/requirements-test.txt
index 9143d7bee07..fb2b3906c1d 100644
--- a/appengine/standard/storage/api-client/requirements-test.txt
+++ b/appengine/standard/storage/api-client/requirements-test.txt
@@ -1,2 +1,2 @@
 pytest==4.6.11; python_version < '3.0'
-WebTest==2.0.35
+WebTest==2.0.35; python_version < '3.0'
diff --git a/appengine/standard/storage/appengine-client/requirements-test.txt b/appengine/standard/storage/appengine-client/requirements-test.txt
index 9143d7bee07..fb2b3906c1d 100644
--- a/appengine/standard/storage/appengine-client/requirements-test.txt
+++ b/appengine/standard/storage/appengine-client/requirements-test.txt
@@ -1,2 +1,2 @@
 pytest==4.6.11; python_version < '3.0'
-WebTest==2.0.35
+WebTest==2.0.35; python_version < '3.0'