diff --git a/CHANGELOG.md b/CHANGELOG.md
index bc5679c..03fa8d3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [1.2.8](https://github.com/googleapis/python-source-context/compare/v1.2.7...v1.2.8) (2022-10-07)
+
+
+### Bug Fixes
+
+* **deps:** Allow protobuf 3.19.5 ([#118](https://github.com/googleapis/python-source-context/issues/118)) ([45a19ad](https://github.com/googleapis/python-source-context/commit/45a19addbc6f1d24048b1566c23c761bdc30fea7))
+
 ## [1.2.7](https://github.com/googleapis/python-source-context/compare/v1.2.6...v1.2.7) (2022-09-29)
 
 
diff --git a/setup.py b/setup.py
index ef9ebf2..0fbe015 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@
 
 name = "google-cloud-source-context"
 description = "Python client for Source Context"
-version = "1.2.7"
+version = "1.2.8"
 release_status = "Development Status :: 5 - Production/Stable"
 url = "https://github.com/googleapis/python-source-context"
 dependencies = [
@@ -30,7 +30,7 @@
     # https://github.com/googleapis/google-cloud-python/issues/10566
     "google-api-core[grpc] >= 1.31.5, <3.0.0dev,!=2.0.*,!=2.1.*,!=2.2.*,!=2.3.0",
     "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",
 ]
 
 package_root = os.path.abspath(os.path.dirname(__file__))
diff --git a/testing/constraints-3.7.txt b/testing/constraints-3.7.txt
index 5bffcfc..9368cd9 100644
--- a/testing/constraints-3.7.txt
+++ b/testing/constraints-3.7.txt
@@ -6,4 +6,4 @@
 # Then this file should have google-cloud-foo==1.14.0
 google-api-core==1.31.5
 proto-plus==1.22.0
-protobuf==3.20.2
+protobuf==3.19.5