diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8cb9864..cb543bd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [2.9.3](https://github.com/googleapis/python-containeranalysis/compare/v2.9.2...v2.9.3) (2022-10-07)
+
+
+### Bug Fixes
+
+* **deps:** Allow protobuf 3.19.5 ([#334](https://github.com/googleapis/python-containeranalysis/issues/334)) ([42986b0](https://github.com/googleapis/python-containeranalysis/commit/42986b00a8dae5047bf63e32f5b1ad44c0fc32fa))
+
 ## [2.9.2](https://github.com/googleapis/python-containeranalysis/compare/v2.9.1...v2.9.2) (2022-10-03)
 
 
diff --git a/samples/snippets/requirements.txt b/samples/snippets/requirements.txt
index 80855f1..10b47fb 100644
--- a/samples/snippets/requirements.txt
+++ b/samples/snippets/requirements.txt
@@ -1,6 +1,6 @@
-google-cloud-pubsub==2.13.6
-google-cloud-containeranalysis==2.9.1
-grafeas==1.5.1
+google-cloud-pubsub==2.13.7
+google-cloud-containeranalysis==2.9.2
+grafeas==1.6.0
 pytest==7.1.3
 flaky==3.7.0
 mock==4.0.3
diff --git a/setup.py b/setup.py
index 590b569..69f0296 100644
--- a/setup.py
+++ b/setup.py
@@ -22,13 +22,13 @@
 
 name = "google-cloud-containeranalysis"
 description = "Container Analysis API API client library"
-version = "2.9.2"
+version = "2.9.3"
 release_status = "Development Status :: 5 - Production/Stable"
 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.*",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
     "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",
     "grafeas >=1.4.1, <2.0dev",
 ]
 extras = {"libcst": "libcst >= 0.2.5"}
diff --git a/testing/constraints-3.7.txt b/testing/constraints-3.7.txt
index 3e38ec7..f2ff391 100644
--- a/testing/constraints-3.7.txt
+++ b/testing/constraints-3.7.txt
@@ -10,5 +10,5 @@ grpc-google-iam-v1==0.12.4
 proto-plus==1.22.0
 libcst==0.2.5
 grafeas==1.4.1
-protobuf==3.20.2
+protobuf==3.19.5