diff --git a/CHANGELOG.md b/CHANGELOG.md
index 009758c..8b63ae8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [1.0.6](https://github.com/googleapis/python-cloud-common/compare/v1.0.5...v1.0.6) (2022-10-07)
+
+
+### Bug Fixes
+
+* **deps:** Allow protobuf 3.19.5 ([#89](https://github.com/googleapis/python-cloud-common/issues/89)) ([4bb2dfb](https://github.com/googleapis/python-cloud-common/commit/4bb2dfbc93efaf63a771b996d1fb2dd648571089))
+
 ## [1.0.5](https://github.com/googleapis/python-cloud-common/compare/v1.0.4...v1.0.5) (2022-09-29)
 
 
diff --git a/setup.py b/setup.py
index 931ca0a..b5c8e75 100644
--- a/setup.py
+++ b/setup.py
@@ -22,7 +22,7 @@
 
 name = "google-cloud-common"
 description = "Google Cloud Common client library"
-version = "1.0.5"
+version = "1.0.6"
 release_status = "Development Status :: 5 - Production/Stable"
 url = "https://github.com/googleapis/python-cloud-common"
 dependencies = [
@@ -31,7 +31,7 @@
     # 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