diff --git a/requirements.txt b/requirements.txt
index 08dfd1ab5..131b65f8b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,8 +5,7 @@ pytest-cov >= 2.4.0
 pytest-localserver >= 0.4.1
 
 cachecontrol >= 0.12.6
-google-api-core[grpc] >= 1.14.0, < 2.0.0dev; platform.python_implementation != 'PyPy'
+google-api-core[grpc] >= 1.22.1, < 2.0.0dev; platform.python_implementation != 'PyPy'
 google-api-python-client >= 1.7.8
-google-auth == 1.18.0  # temporary workaround
-google-cloud-firestore >= 1.4.0; platform.python_implementation != 'PyPy'
-google-cloud-storage >= 1.18.0
+google-cloud-firestore >= 2.1.0; platform.python_implementation != 'PyPy'
+google-cloud-storage >= 1.37.1
diff --git a/setup.py b/setup.py
index ea8286dce..83b7291df 100644
--- a/setup.py
+++ b/setup.py
@@ -38,10 +38,10 @@
                     'to integrate Firebase into their services and applications.')
 install_requires = [
     'cachecontrol>=0.12.6',
-    'google-api-core[grpc] >= 1.14.0, < 2.0.0dev; platform.python_implementation != "PyPy"',
+    'google-api-core[grpc] >= 1.22.1, < 2.0.0dev; platform.python_implementation != "PyPy"',
     'google-api-python-client >= 1.7.8',
-    'google-cloud-firestore>=1.4.0; platform.python_implementation != "PyPy"',
-    'google-cloud-storage>=1.18.0',
+    'google-cloud-firestore>=2.1.0; platform.python_implementation != "PyPy"',
+    'google-cloud-storage>=1.37.1',
 ]
 
 setup(
diff --git a/tests/test_token_gen.py b/tests/test_token_gen.py
index d8450c59c..b0a744f1d 100644
--- a/tests/test_token_gen.py
+++ b/tests/test_token_gen.py
@@ -259,7 +259,7 @@ def test_sign_with_iam(self):
             testutils.MockCredential(), name='iam-signer-app', options=options)
         try:
             signature = base64.b64encode(b'test').decode()
-            iam_resp = '{{"signature": "{0}"}}'.format(signature)
+            iam_resp = '{{"signedBlob": "{0}"}}'.format(signature)
             _overwrite_iam_request(app, testutils.MockRequest(200, iam_resp))
             custom_token = auth.create_custom_token(MOCK_UID, app=app).decode()
             assert custom_token.endswith('.' + signature.rstrip('='))
@@ -297,7 +297,7 @@ def test_sign_with_discovered_service_account(self):
             # Now invoke the IAM signer.
             signature = base64.b64encode(b'test').decode()
             request.response = testutils.MockResponse(
-                200, '{{"signature": "{0}"}}'.format(signature))
+                200, '{{"signedBlob": "{0}"}}'.format(signature))
             custom_token = auth.create_custom_token(MOCK_UID, app=app).decode()
             assert custom_token.endswith('.' + signature.rstrip('='))
             self._verify_signer(custom_token, 'discovered-service-account')