diff --git a/setup.py b/setup.py
index 8d18a0a..5ab8549 100644
--- a/setup.py
+++ b/setup.py
@@ -44,7 +44,7 @@
install_requires=(
"google-api-core[grpc] >= 1.32.0, <3.0.0dev,!=2.0.*,!=2.1.*,!=2.2.*,!=2.3.*,!=2.4.*,!=2.5.*,!=2.6.*,!=2.7.*",
"proto-plus >= 1.22.0, <2.0.0dev",
- "protobuf >= 3.20.2, <5.0.0dev",
+ "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
),
python_requires=">=3.7",
classifiers=[
diff --git a/testing/constraints-3.7.txt b/testing/constraints-3.7.txt
index 260e08b..5dcaa6f 100644
--- a/testing/constraints-3.7.txt
+++ b/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
# Then this file should have foo==1.14.0
google-api-core==1.32.0
proto-plus==1.22.0
-protobuf==3.20.2
+protobuf==3.19.5
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