diff --git a/CHANGELOG.md b/CHANGELOG.md
index 57f1deb5..f5802703 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,13 @@
 
 [1]: https://pypi.org/project/google-cloud-bigquery-datatransfer/#history
 
+## [3.7.3](https://github.com/googleapis/python-bigquery-datatransfer/compare/v3.7.2...v3.7.3) (2022-10-07)
+
+
+### Bug Fixes
+
+* **deps:** Allow protobuf 3.19.5 ([#400](https://github.com/googleapis/python-bigquery-datatransfer/issues/400)) ([5e71c7c](https://github.com/googleapis/python-bigquery-datatransfer/commit/5e71c7c38ee937a4b61dc6a0f1ba79431a7d97b1))
+
 ## [3.7.2](https://github.com/googleapis/python-bigquery-datatransfer/compare/v3.7.1...v3.7.2) (2022-09-29)
 
 
diff --git a/samples/snippets/requirements-test.txt b/samples/snippets/requirements-test.txt
index a4f28ec0..b6be017f 100644
--- a/samples/snippets/requirements-test.txt
+++ b/samples/snippets/requirements-test.txt
@@ -1,4 +1,4 @@
-google-cloud-bigquery==3.3.2
-google-cloud-pubsub==2.13.6
+google-cloud-bigquery==3.3.3
+google-cloud-pubsub==2.13.7
 pytest==7.1.3
 mock==4.0.3
diff --git a/samples/snippets/requirements.txt b/samples/snippets/requirements.txt
index a81d3de5..0ee6773f 100644
--- a/samples/snippets/requirements.txt
+++ b/samples/snippets/requirements.txt
@@ -1 +1 @@
-google-cloud-bigquery-datatransfer==3.7.1
+google-cloud-bigquery-datatransfer==3.7.2
diff --git a/setup.py b/setup.py
index 7dfe72a0..98c2599b 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@
 
 name = "google-cloud-bigquery-datatransfer"
 description = "BigQuery Data Transfer API client library"
-version = "3.7.2"
+version = "3.7.3"
 # Should be one of:
 # 'Development Status :: 3 - Alpha'
 # 'Development Status :: 4 - Beta'
@@ -30,7 +30,7 @@
 dependencies = (
     "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",
 )
 
 extras = {"libcst": "libcst >= 0.2.5"}
diff --git a/testing/constraints-3.7.txt b/testing/constraints-3.7.txt
index 9c98bbf5..28b41909 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
 libcst==0.2.5
-protobuf==3.20.2
+protobuf==3.19.5