diff --git a/noxfile.py b/noxfile.py
index d3d763c6..a3936076 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -42,7 +42,7 @@ def lint(session):
     Returns a failure if the linters find linting errors or sufficiently
     serious code quality issues.
     """
-    session.install("flake8", BLACK_VERSION)
+    session.install("flake8", BLACK_VERSION, "click<8.1.0")
     session.run("black", "--check", *BLACK_PATHS)
     session.run("flake8", "google", "tests")
 
@@ -57,7 +57,7 @@ def blacken(session):
     That run uses an image that doesn't have 3.6 installed. Before updating this
     check the state of the `gcp_ubuntu_config` we use for that Kokoro run.
     """
-    session.install(BLACK_VERSION)
+    session.install(BLACK_VERSION, "click<8.1.0")
     session.run("black", *BLACK_PATHS)
 
 
diff --git a/setup.py b/setup.py
index 8a228036..8486ff87 100644
--- a/setup.py
+++ b/setup.py
@@ -28,7 +28,7 @@
 # 'Development Status :: 5 - Production/Stable'
 release_status = "Development Status :: 4 - Beta"
 dependencies = [
-    "google-api-core[grpc] >= 1.14.0, < 2.0.0dev",
+    "google-api-core[grpc] >= 1.31.5, <3.0.0dev,!=2.0.*,!=2.1.*,!=2.2.*,!=2.3.0",
     "grpc-google-iam-v1 >= 0.12.3, < 0.13dev",
     'enum34; python_version < "3.4"',
 ]