diff --git a/tests/opentelemetry-test-utils/setup.cfg b/tests/opentelemetry-test-utils/setup.cfg
index dc2c84d6d47..67d67d59425 100644
--- a/tests/opentelemetry-test-utils/setup.cfg
+++ b/tests/opentelemetry-test-utils/setup.cfg
@@ -40,9 +40,10 @@ packages=find_namespace:
 install_requires =
     opentelemetry-api ~= 1.3
     opentelemetry-sdk ~= 1.3
+    asgiref ~= 3.0
 
 [options.extras_require]
-test = flask~=2.0
+test =
 
 [options.packages.find]
 where = src
diff --git a/tox.ini b/tox.ini
index 8d5973b166f..e3a1c6e1a3f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -198,6 +198,9 @@ commands_pre =
   python -m pip install -e {toxinidir}/opentelemetry-api[test]
   python -m pip install -e {toxinidir}/opentelemetry-semantic-conventions[test]
   python -m pip install -e {toxinidir}/opentelemetry-sdk[test]
+  # Pin protobuf version due to lint failing on v3.20.0
+  # https://github.com/protocolbuffers/protobuf/issues/9730
+  python -m pip install protobuf==3.19.4
   python -m pip install -e {toxinidir}/opentelemetry-proto[test]
   python -m pip install -e {toxinidir}/tests/opentelemetry-test-utils[test]
   python -m pip install -e {toxinidir}/shim/opentelemetry-opentracing-shim[test]