diff --git a/testing/constraints-3.7.txt b/testing/constraints-3.7.txt
index a405afdd..1d9efed7 100644
--- a/testing/constraints-3.7.txt
+++ b/testing/constraints-3.7.txt
@@ -16,4 +16,4 @@ pandas==0.24.2
 pyarrow==3.0.0
 pydata-google-auth==0.1.2
 tqdm==4.23.0
-protobuf==3.20.2
+protobuf==3.19.5