diff --git a/testing/constraints-3.7-python-pubsub.txt b/testing/constraints-3.7-python-pubsub.txt
index 87ee8c9..f4b2140 100644
--- a/testing/constraints-3.7-python-pubsub.txt
+++ b/testing/constraints-3.7-python-pubsub.txt
@@ -7,3 +7,5 @@
 # Then this file should have foo==1.14.0
 protobuf==3.20.2
 grpcio==1.51.3
+opentelemetry-api
+opentelemetry-sdk