diff --git a/noxfile.py b/noxfile.py
index 236b59c..94661df 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -12,10 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import shutil
 import os
+import pathlib
+import shutil
+
 import nox
 
+CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
+
 TEST_DEPENDENCIES = [
     "flask",
     "freezegun",
@@ -84,15 +88,20 @@
 
 @nox.session(python=["3.6", "3.7", "3.8", "3.9"])
 def unit(session):
-    session.install(*TEST_DEPENDENCIES)
-    session.install(*(ASYNC_DEPENDENCIES))
-    session.install(".")
+    constraints_path = str(
+        CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
+    )
+    add_constraints = ["-c", constraints_path]
+    session.install(*(TEST_DEPENDENCIES + add_constraints))
+    session.install(*(ASYNC_DEPENDENCIES + add_constraints))
+    session.install(".", *add_constraints)
     session.run(
         "pytest",
         f"--junitxml=unit_{session.python}_sponge_log.xml",
         "--cov=google.auth",
         "--cov=google.oauth2",
         "--cov=tests",
+        "--cov-report=term-missing",
         "tests",
         "tests_async",
     )
@@ -123,7 +132,7 @@
         "--cov=google.oauth2",
         "--cov=tests",
         "--cov=tests_async",
-        "--cov-report=",
+        "--cov-report=term-missing",
         "tests",
         "tests_async",
     )
diff --git a/setup.py b/setup.py
index f2fd4e5..a9bfc97 100644
--- a/setup.py
+++ b/setup.py
@@ -33,8 +33,7 @@
 extras = {
     "aiohttp": [
         "aiohttp >= 3.6.2, < 4.0.0dev; python_version>='3.6'",
-        "requests >= 2.18.0, < 3.0.0dev",
-        "urllib3 >= 1.0.0, <2.0.0dev",
+        "requests >= 2.20.0, < 3.0.0dev",
     ],
     "pyopenssl": "pyopenssl>=20.0.0",
     "reauth": "pyu2f>=0.1.5",
diff --git a/testing/constraints-3.6.txt b/testing/constraints-3.6.txt
index 7cb802a..ad6f598 100644
--- a/testing/constraints-3.6.txt
+++ b/testing/constraints-3.6.txt
@@ -9,8 +9,6 @@
 pyasn1-modules==0.2.1
 setuptools==40.3.0
 six==1.9.0
-rsa==4.6
 rsa==3.1.4
 aiohttp==3.6.2
-requests==2.18.0
-urllib3==1.0.0
+requests==2.20.0