diff --git a/requirements.bazel.txt b/requirements.bazel.txt
index efbf5314afd..61e529a6ec8 100644
--- a/requirements.bazel.txt
+++ b/requirements.bazel.txt
@@ -9,3 +9,7 @@ futures>=2.2.0
 google-auth>=1.0.0
 oauth2client==4.1.0
 requests>=2.14.2
+urllib3==1.22
+chardet==3.0.4
+certifi==2017.4.17
+idna==2.7
diff --git a/src/python/grpcio_tests/tests/interop/BUILD.bazel b/src/python/grpcio_tests/tests/interop/BUILD.bazel
index a39f30d32ab..aebdbf67ebf 100644
--- a/src/python/grpcio_tests/tests/interop/BUILD.bazel
+++ b/src/python/grpcio_tests/tests/interop/BUILD.bazel
@@ -35,6 +35,10 @@ py_library(
         requirement('google-auth'),
         requirement('requests'),
         requirement('enum34'),
+        requirement('urllib3'),
+        requirement('chardet'),
+        requirement('certifi'),
+        requirement('idna'),
     ],
     imports=["../../",],
 )