diff --git a/java-os-config/CHANGELOG.md b/java-os-config/CHANGELOG.md
index 9012cba89fcb..e17b132ae022 100644
--- a/java-os-config/CHANGELOG.md
+++ b/java-os-config/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [2.5.6](https://github.com/googleapis/java-os-config/compare/v2.5.5...v2.5.6) (2022-10-05)
+
+
+### Bug Fixes
+
+* update protobuf to v3.21.7 ([e8e2da5](https://github.com/googleapis/java-os-config/commit/e8e2da55a237b6f702dcf8fe3c1970a5707bf1f5))
+
 ## [2.5.5](https://github.com/googleapis/java-os-config/compare/v2.5.4...v2.5.5) (2022-10-03)
 
 
diff --git a/java-os-config/README.md b/java-os-config/README.md
index d0f07d31d593..d012525c906b 100644
--- a/java-os-config/README.md
+++ b/java-os-config/README.md
@@ -19,20 +19,20 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-os-config</artifactId>
-  <version>2.5.4</version>
+  <version>2.5.5</version>
 </dependency>
 ```
 
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-os-config:2.5.4'
+implementation 'com.google.cloud:google-cloud-os-config:2.5.5'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-os-config" % "2.5.4"
+libraryDependencies += "com.google.cloud" % "google-cloud-os-config" % "2.5.5"
 ```
 
 ## Authentication
diff --git a/java-os-config/google-cloud-os-config-bom/pom.xml b/java-os-config/google-cloud-os-config-bom/pom.xml
index d181dc9ab750..6434ee4f4d86 100644
--- a/java-os-config/google-cloud-os-config-bom/pom.xml
+++ b/java-os-config/google-cloud-os-config-bom/pom.xml
@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-os-config-bom</artifactId>
-  <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:google-cloud-os-config:current} -->
+  <version>2.5.6</version><!-- {x-version-update:google-cloud-os-config:current} -->
   <packaging>pom</packaging>
   <parent>
     <groupId>com.google.cloud</groupId>
@@ -52,37 +52,37 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-os-config</artifactId>
-        <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:google-cloud-os-config:current} -->
+        <version>2.5.6</version><!-- {x-version-update:google-cloud-os-config:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-os-config-v1</artifactId>
-        <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-os-config-v1:current} -->
+        <version>2.5.6</version><!-- {x-version-update:grpc-google-cloud-os-config-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-os-config-v1beta</artifactId>
-        <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-os-config-v1beta:current} -->
+        <version>2.5.6</version><!-- {x-version-update:grpc-google-cloud-os-config-v1beta:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-os-config-v1alpha</artifactId>
-        <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-os-config-v1alpha:current} -->
+        <version>2.5.6</version><!-- {x-version-update:grpc-google-cloud-os-config-v1alpha:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-os-config-v1</artifactId>
-        <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-os-config-v1:current} -->
+        <version>2.5.6</version><!-- {x-version-update:proto-google-cloud-os-config-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-os-config-v1alpha</artifactId>
-        <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-os-config-v1alpha:current} -->
+        <version>2.5.6</version><!-- {x-version-update:proto-google-cloud-os-config-v1alpha:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-os-config-v1beta</artifactId>
-        <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-os-config-v1beta:current} -->
+        <version>2.5.6</version><!-- {x-version-update:proto-google-cloud-os-config-v1beta:current} -->
       </dependency>
     </dependencies>
   </dependencyManagement>
diff --git a/java-os-config/google-cloud-os-config/pom.xml b/java-os-config/google-cloud-os-config/pom.xml
index cab3eb3abc54..d7f305fdd793 100644
--- a/java-os-config/google-cloud-os-config/pom.xml
+++ b/java-os-config/google-cloud-os-config/pom.xml
@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-os-config</artifactId>
-  <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:google-cloud-os-config:current} -->
+  <version>2.5.6</version><!-- {x-version-update:google-cloud-os-config:current} -->
   <packaging>jar</packaging>
   <name>Google OS Config API</name>
   <url>https://github.com/googleapis/java-os-config</url>
@@ -11,7 +11,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-os-config-parent</artifactId>
-    <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:google-cloud-os-config:current} -->
+    <version>2.5.6</version><!-- {x-version-update:google-cloud-os-config:current} -->
   </parent>
   <properties>
     <site.installationModule>google-cloud-os-config</site.installationModule>
diff --git a/java-os-config/grpc-google-cloud-os-config-v1/pom.xml b/java-os-config/grpc-google-cloud-os-config-v1/pom.xml
index 67902c4dcf91..f2cd3095ebd8 100644
--- a/java-os-config/grpc-google-cloud-os-config-v1/pom.xml
+++ b/java-os-config/grpc-google-cloud-os-config-v1/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>grpc-google-cloud-os-config-v1</artifactId>
-  <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-os-config-v1:current} -->
+  <version>2.5.6</version><!-- {x-version-update:grpc-google-cloud-os-config-v1:current} -->
   <name>grpc-google-cloud-os-config-v1</name>
   <description>GRPC library for grpc-google-cloud-os-config-v1</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-os-config-parent</artifactId>
-    <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:google-cloud-os-config:current} -->
+    <version>2.5.6</version><!-- {x-version-update:google-cloud-os-config:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/java-os-config/grpc-google-cloud-os-config-v1alpha/pom.xml b/java-os-config/grpc-google-cloud-os-config-v1alpha/pom.xml
index 635611823797..5a5a01319999 100644
--- a/java-os-config/grpc-google-cloud-os-config-v1alpha/pom.xml
+++ b/java-os-config/grpc-google-cloud-os-config-v1alpha/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>grpc-google-cloud-os-config-v1alpha</artifactId>
-  <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-os-config-v1alpha:current} -->
+  <version>2.5.6</version><!-- {x-version-update:grpc-google-cloud-os-config-v1alpha:current} -->
   <name>grpc-google-cloud-os-config-v1alpha</name>
   <description>GRPC library for google-cloud-os-config</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-os-config-parent</artifactId>
-    <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:google-cloud-os-config:current} -->
+    <version>2.5.6</version><!-- {x-version-update:google-cloud-os-config:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/java-os-config/grpc-google-cloud-os-config-v1beta/pom.xml b/java-os-config/grpc-google-cloud-os-config-v1beta/pom.xml
index ff01cf5af6d3..e6b9b58f3561 100644
--- a/java-os-config/grpc-google-cloud-os-config-v1beta/pom.xml
+++ b/java-os-config/grpc-google-cloud-os-config-v1beta/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>grpc-google-cloud-os-config-v1beta</artifactId>
-  <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-os-config-v1beta:current} -->
+  <version>2.5.6</version><!-- {x-version-update:grpc-google-cloud-os-config-v1beta:current} -->
   <name>grpc-google-cloud-os-config-v1beta</name>
   <description>GRPC library for google-cloud-os-config</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-os-config-parent</artifactId>
-    <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:google-cloud-os-config:current} -->
+    <version>2.5.6</version><!-- {x-version-update:google-cloud-os-config:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/java-os-config/pom.xml b/java-os-config/pom.xml
index 30d9ecfe3987..689fd2256d71 100644
--- a/java-os-config/pom.xml
+++ b/java-os-config/pom.xml
@@ -4,7 +4,7 @@
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-os-config-parent</artifactId>
   <packaging>pom</packaging>
-  <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:google-cloud-os-config:current} -->
+  <version>2.5.6</version><!-- {x-version-update:google-cloud-os-config:current} -->
   <name>Google OS Config API Parent</name>
   <url>https://github.com/googleapis/java-os-config</url>
   <description>
@@ -61,37 +61,37 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-os-config</artifactId>
-        <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:google-cloud-os-config:current} -->
+        <version>2.5.6</version><!-- {x-version-update:google-cloud-os-config:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-os-config-v1beta</artifactId>
-        <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-os-config-v1beta:current} -->
+        <version>2.5.6</version><!-- {x-version-update:proto-google-cloud-os-config-v1beta:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-os-config-v1alpha</artifactId>
-        <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-os-config-v1alpha:current} -->
+        <version>2.5.6</version><!-- {x-version-update:proto-google-cloud-os-config-v1alpha:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-os-config-v1alpha</artifactId>
-        <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-os-config-v1alpha:current} -->
+        <version>2.5.6</version><!-- {x-version-update:grpc-google-cloud-os-config-v1alpha:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-os-config-v1beta</artifactId>
-        <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-os-config-v1beta:current} -->
+        <version>2.5.6</version><!-- {x-version-update:grpc-google-cloud-os-config-v1beta:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-os-config-v1</artifactId>
-        <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-os-config-v1:current} -->
+        <version>2.5.6</version><!-- {x-version-update:proto-google-cloud-os-config-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-os-config-v1</artifactId>
-        <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-os-config-v1:current} -->
+        <version>2.5.6</version><!-- {x-version-update:grpc-google-cloud-os-config-v1:current} -->
       </dependency>
 
       <dependency>
diff --git a/java-os-config/proto-google-cloud-os-config-v1/pom.xml b/java-os-config/proto-google-cloud-os-config-v1/pom.xml
index 4585d061c071..2e6417fd6c3b 100644
--- a/java-os-config/proto-google-cloud-os-config-v1/pom.xml
+++ b/java-os-config/proto-google-cloud-os-config-v1/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>proto-google-cloud-os-config-v1</artifactId>
-  <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-os-config-v1:current} -->
+  <version>2.5.6</version><!-- {x-version-update:proto-google-cloud-os-config-v1:current} -->
   <name>proto-google-cloud-os-config-v1</name>
   <description>PROTO library for proto-google-cloud-os-config-v1</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-os-config-parent</artifactId>
-    <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:google-cloud-os-config:current} -->
+    <version>2.5.6</version><!-- {x-version-update:google-cloud-os-config:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/java-os-config/proto-google-cloud-os-config-v1alpha/pom.xml b/java-os-config/proto-google-cloud-os-config-v1alpha/pom.xml
index c6d3fa975bf7..52dec004cf5e 100644
--- a/java-os-config/proto-google-cloud-os-config-v1alpha/pom.xml
+++ b/java-os-config/proto-google-cloud-os-config-v1alpha/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>proto-google-cloud-os-config-v1alpha</artifactId>
-  <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-os-config-v1alpha:current} -->
+  <version>2.5.6</version><!-- {x-version-update:proto-google-cloud-os-config-v1alpha:current} -->
   <name>proto-google-cloud-os-config-v1alpha</name>
   <description>Proto library for google-cloud-os-config</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-os-config-parent</artifactId>
-    <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:google-cloud-os-config:current} -->
+    <version>2.5.6</version><!-- {x-version-update:google-cloud-os-config:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/java-os-config/proto-google-cloud-os-config-v1beta/pom.xml b/java-os-config/proto-google-cloud-os-config-v1beta/pom.xml
index 78684522e247..2471479e40be 100644
--- a/java-os-config/proto-google-cloud-os-config-v1beta/pom.xml
+++ b/java-os-config/proto-google-cloud-os-config-v1beta/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>proto-google-cloud-os-config-v1beta</artifactId>
-  <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-os-config-v1beta:current} -->
+  <version>2.5.6</version><!-- {x-version-update:proto-google-cloud-os-config-v1beta:current} -->
   <name>proto-google-cloud-os-config-v1beta</name>
   <description>Proto library for google-cloud-os-config</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-os-config-parent</artifactId>
-    <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:google-cloud-os-config:current} -->
+    <version>2.5.6</version><!-- {x-version-update:google-cloud-os-config:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/java-os-config/samples/snapshot/pom.xml b/java-os-config/samples/snapshot/pom.xml
index bc1860a6ef6e..12fdeed953fb 100644
--- a/java-os-config/samples/snapshot/pom.xml
+++ b/java-os-config/samples/snapshot/pom.xml
@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-os-config</artifactId>
-      <version>2.5.6-SNAPSHOT</version>
+      <version>2.5.6</version>
     </dependency>
     <!-- {x-version-update-end} -->
 
diff --git a/java-os-config/versions.txt b/java-os-config/versions.txt
index 1909eea02ea9..2595414e4e83 100644
--- a/java-os-config/versions.txt
+++ b/java-os-config/versions.txt
@@ -1,10 +1,10 @@
 # Format:
 # module:released-version:current-version
 
-google-cloud-os-config:2.5.5:2.5.6-SNAPSHOT
-grpc-google-cloud-os-config-v1:2.5.5:2.5.6-SNAPSHOT
-grpc-google-cloud-os-config-v1beta:2.5.5:2.5.6-SNAPSHOT
-grpc-google-cloud-os-config-v1alpha:2.5.5:2.5.6-SNAPSHOT
-proto-google-cloud-os-config-v1:2.5.5:2.5.6-SNAPSHOT
-proto-google-cloud-os-config-v1alpha:2.5.5:2.5.6-SNAPSHOT
-proto-google-cloud-os-config-v1beta:2.5.5:2.5.6-SNAPSHOT
+google-cloud-os-config:2.5.6:2.5.6
+grpc-google-cloud-os-config-v1:2.5.6:2.5.6
+grpc-google-cloud-os-config-v1beta:2.5.6:2.5.6
+grpc-google-cloud-os-config-v1alpha:2.5.6:2.5.6
+proto-google-cloud-os-config-v1:2.5.6:2.5.6
+proto-google-cloud-os-config-v1alpha:2.5.6:2.5.6
+proto-google-cloud-os-config-v1beta:2.5.6:2.5.6