diff --git a/CHANGELOG.md b/CHANGELOG.md
index 234ef150..0d6959a7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,13 @@
 
 [1]: https://pypi.org/project/google-cloud-texttospeech/#history
 
+## [2.12.3](https://github.com/googleapis/python-texttospeech/compare/v2.12.2...v2.12.3) (2022-10-07)
+
+
+### Bug Fixes
+
+* **deps:** Allow protobuf 3.19.5 ([#338](https://github.com/googleapis/python-texttospeech/issues/338)) ([aa92121](https://github.com/googleapis/python-texttospeech/commit/aa921215c05588b6555b7b41381b30f8b0079d54))
+
 ## [2.12.2](https://github.com/googleapis/python-texttospeech/compare/v2.12.1...v2.12.2) (2022-10-03)
 
 
diff --git a/samples/snippets/requirements.txt b/samples/snippets/requirements.txt
index b654c18c..953235c8 100644
--- a/samples/snippets/requirements.txt
+++ b/samples/snippets/requirements.txt
@@ -1,2 +1,2 @@
 future==0.18.2
-google-cloud-texttospeech==2.12.1
+google-cloud-texttospeech==2.12.2
diff --git a/setup.py b/setup.py
index b3f3feed..ff386677 100644
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,7 @@
 
 name = "google-cloud-texttospeech"
 description = "Google Cloud Text-to-Speech API client library"
-version = "2.12.2"
+version = "2.12.3"
 # Should be one of:
 # 'Development Status :: 3 - Alpha'
 # 'Development Status :: 4 - Beta'
@@ -43,7 +43,7 @@
 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 = {}
 
diff --git a/testing/constraints-3.7.txt b/testing/constraints-3.7.txt
index 260e08b9..5dcaa6fd 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