diff --git a/CHANGELOG.md b/CHANGELOG.md
index badb9f9a..fc271c0c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [1.5.3](https://github.com/googleapis/python-service-directory/compare/v1.5.2...v1.5.3) (2022-10-07)
+
+
+### Bug Fixes
+
+* **deps:** Allow protobuf 3.19.5 ([#239](https://github.com/googleapis/python-service-directory/issues/239)) ([9406ff6](https://github.com/googleapis/python-service-directory/commit/9406ff66562481d656cd36d68ef5b937e742ec22))
+
 ## [1.5.2](https://github.com/googleapis/python-service-directory/compare/v1.5.1...v1.5.2) (2022-10-03)
 
 
diff --git a/setup.py b/setup.py
index 787a0857..94569842 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
 
 import setuptools  # type: ignore
 
-version = "1.5.2"
+version = "1.5.3"
 
 package_root = os.path.abspath(os.path.dirname(__file__))
 
@@ -43,7 +43,7 @@
     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",
         "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
     ),
     python_requires=">=3.7",
diff --git a/testing/constraints-3.7.txt b/testing/constraints-3.7.txt
index c52b1ed7..fb33557f 100644
--- a/testing/constraints-3.7.txt
+++ b/testing/constraints-3.7.txt
@@ -8,4 +8,4 @@
 google-api-core==1.32.0
 proto-plus==1.22.0
 grpc-google-iam-v1==0.12.4
-protobuf==3.20.2
+protobuf==3.19.5