diff --git a/docs/kop.md b/docs/kop.md
index 14348a51c4..7631737672 100644
--- a/docs/kop.md
+++ b/docs/kop.md
@@ -1,5 +1,5 @@
 ---
-download: "https://github.com/streamnative/kop/releases/download/v{{protocol:version}}/pulsar-protocol-handler-kafka-{{protocol:version}}.nar"
+download: "https://github.com/streamnative/kop/releases/download/v2.8.1.15/pulsar-protocol-handler-kafka-2.8.1.15.nar"
 alias: KoP - Kafka on Pulsar
 ---
 
@@ -21,7 +21,7 @@ The following figure illustrates how the Kafka-on-Pulsar protocol handler is imp
 # Get Started with KoP
 
 If you have an Apache Pulsar cluster, you can enable Kafka-on-Pulsar on your existing Pulsar cluster by downloading and installing the KoP protocol handler to Pulsar brokers directly. It takes three steps:
-1. Download KoP protocol handler, or build the `./kafka-impl/target/pulsar-protocol-handler-kafka-{{protocol:version}}.nar` file, and then copy it to your Pulsar `protocols` directory.
+1. Download KoP protocol handler, or build the `./kafka-impl/target/pulsar-protocol-handler-kafka-2.8.1.15.nar` file, and then copy it to your Pulsar `protocols` directory.
 2. Set the configuration of the KoP protocol handler in Pulsar `broker.conf` or `standalone.conf` files.
 3. Restart Pulsar brokers to load KoP protocol handler.
 
@@ -54,7 +54,7 @@ To build the KoP protocol handler from the source, follow thse steps.
 3. Get the `.nar` file in the following directory and copy it your Pulsar `protocols` directory. You need to create the `protocols` folder in Pulsar if it's the first time you use protocol handlers.
 
     ```bash
-    ./kafka-impl/target/pulsar-protocol-handler-kafka-{{protocol:version}}.nar
+    ./kafka-impl/target/pulsar-protocol-handler-kafka-2.8.1.15.nar
     ```
 
 ## Set configuration for KoP
@@ -133,10 +133,10 @@ After you have installed the KoP protocol handler to Pulsar broker, you can rest
 
 # How to use KoP
 You can configure and manage KoP based on your requirements. Check the following guides for more details.
-- [Configure KoP](https://github.com/streamnative/kop/blob/branch-{{protocol:version}}/docs/configuration.md)
-- [Secure KoP](https://github.com/streamnative/kop/blob/branch-{{protocol:version}}/docs/security.md)
-- [Manage KoP with the Envoy proxy](https://github.com/streamnative/kop/blob/branch-{{protocol:version}}/docs/envoy-proxy.md)
-- [Implementation: How to converse Pulsar and Kafka](https://github.com/streamnative/kop/blob/branch-{{protocol:version}}/docs/implementation.md)
+- [Configure KoP](https://github.com/streamnative/kop/blob/branch-2.8.1.15/docs/configuration.md)
+- [Secure KoP](https://github.com/streamnative/kop/blob/branch-2.8.1.15/docs/security.md)
+- [Manage KoP with the Envoy proxy](https://github.com/streamnative/kop/blob/branch-2.8.1.15/docs/envoy-proxy.md)
+- [Implementation: How to converse Pulsar and Kafka](https://github.com/streamnative/kop/blob/branch-2.8.1.15/docs/implementation.md)
 
 The followings are important information when you configure and use KoP.
 
diff --git a/kafka-0-10/pom.xml b/kafka-0-10/pom.xml
index cc67c47dae..c12afcec55 100644
--- a/kafka-0-10/pom.xml
+++ b/kafka-0-10/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>pulsar-protocol-handler-kafka-parent</artifactId>
     <groupId>io.streamnative.pulsar.handlers</groupId>
-    <version>2.9.0-SNAPSHOT</version>
+    <version>2.8.1.15</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
@@ -32,7 +32,7 @@
     <dependency>
       <groupId>io.streamnative.pulsar.handlers</groupId>
       <artifactId>kafka-client-api</artifactId>
-      <version>2.9.0-SNAPSHOT</version>
+      <version>2.8.1.15</version>
     </dependency>
     <dependency>
       <groupId>org.apache.kafka</groupId>
diff --git a/kafka-1-0/pom.xml b/kafka-1-0/pom.xml
index 7ad0449e94..d0c13023cf 100644
--- a/kafka-1-0/pom.xml
+++ b/kafka-1-0/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>pulsar-protocol-handler-kafka-parent</artifactId>
     <groupId>io.streamnative.pulsar.handlers</groupId>
-    <version>2.9.0-SNAPSHOT</version>
+    <version>2.8.1.15</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
@@ -32,7 +32,7 @@
     <dependency>
       <groupId>io.streamnative.pulsar.handlers</groupId>
       <artifactId>kafka-client-api</artifactId>
-      <version>2.9.0-SNAPSHOT</version>
+      <version>2.8.1.15</version>
     </dependency>
     <dependency>
       <groupId>org.apache.kafka</groupId>
diff --git a/kafka-2-8/pom.xml b/kafka-2-8/pom.xml
index d73410a079..96cfba1b85 100644
--- a/kafka-2-8/pom.xml
+++ b/kafka-2-8/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>pulsar-protocol-handler-kafka-parent</artifactId>
     <groupId>io.streamnative.pulsar.handlers</groupId>
-    <version>2.9.0-SNAPSHOT</version>
+    <version>2.8.1.15</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
@@ -32,7 +32,7 @@
     <dependency>
       <groupId>io.streamnative.pulsar.handlers</groupId>
       <artifactId>kafka-client-api</artifactId>
-      <version>2.9.0-SNAPSHOT</version>
+      <version>2.8.1.15</version>
     </dependency>
     <dependency>
       <groupId>org.apache.kafka</groupId>
diff --git a/kafka-3-0/pom.xml b/kafka-3-0/pom.xml
index 8d174de154..be65663a82 100644
--- a/kafka-3-0/pom.xml
+++ b/kafka-3-0/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>pulsar-protocol-handler-kafka-parent</artifactId>
     <groupId>io.streamnative.pulsar.handlers</groupId>
-    <version>2.9.0-SNAPSHOT</version>
+    <version>2.8.1.15</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
@@ -32,7 +32,7 @@
     <dependency>
       <groupId>io.streamnative.pulsar.handlers</groupId>
       <artifactId>kafka-client-api</artifactId>
-      <version>2.9.0-SNAPSHOT</version>
+      <version>2.8.1.15</version>
     </dependency>
     <dependency>
       <groupId>org.apache.kafka</groupId>
diff --git a/kafka-client-api/pom.xml b/kafka-client-api/pom.xml
index 04e1bd1c9b..f5a61815d5 100644
--- a/kafka-client-api/pom.xml
+++ b/kafka-client-api/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>pulsar-protocol-handler-kafka-parent</artifactId>
     <groupId>io.streamnative.pulsar.handlers</groupId>
-    <version>2.9.0-SNAPSHOT</version>
+    <version>2.8.1.15</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
diff --git a/kafka-client-factory/pom.xml b/kafka-client-factory/pom.xml
index 5ddf751e38..afacc2545f 100644
--- a/kafka-client-factory/pom.xml
+++ b/kafka-client-factory/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>pulsar-protocol-handler-kafka-parent</artifactId>
     <groupId>io.streamnative.pulsar.handlers</groupId>
-    <version>2.9.0-SNAPSHOT</version>
+    <version>2.8.1.15</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
@@ -32,27 +32,27 @@
     <dependency>
       <groupId>io.streamnative.pulsar.handlers</groupId>
       <artifactId>kafka-client-api</artifactId>
-      <version>2.9.0-SNAPSHOT</version>
+      <version>2.8.1.15</version>
     </dependency>
     <dependency>
       <groupId>io.streamnative.pulsar.handlers</groupId>
       <artifactId>kafka-1-0</artifactId>
-      <version>2.9.0-SNAPSHOT</version>
+      <version>2.8.1.15</version>
     </dependency>
     <dependency>
       <groupId>io.streamnative.pulsar.handlers</groupId>
       <artifactId>kafka-0-10</artifactId>
-      <version>2.9.0-SNAPSHOT</version>
+      <version>2.8.1.15</version>
     </dependency>
     <dependency>
       <groupId>io.streamnative.pulsar.handlers</groupId>
       <artifactId>kafka-2-8</artifactId>
-      <version>2.9.0-SNAPSHOT</version>
+      <version>2.8.1.15</version>
     </dependency>
     <dependency>
       <groupId>io.streamnative.pulsar.handlers</groupId>
       <artifactId>kafka-3-0</artifactId>
-      <version>2.9.0-SNAPSHOT</version>
+      <version>2.8.1.15</version>
     </dependency>
   </dependencies>
 </project>
diff --git a/kafka-impl/pom.xml b/kafka-impl/pom.xml
index 38531f63a0..4ff496ecbd 100644
--- a/kafka-impl/pom.xml
+++ b/kafka-impl/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>io.streamnative.pulsar.handlers</groupId>
     <artifactId>pulsar-protocol-handler-kafka-parent</artifactId>
-    <version>2.9.0-SNAPSHOT</version>
+    <version>2.8.1.15</version>
   </parent>
 
   <groupId>io.streamnative.pulsar.handlers</groupId>
diff --git a/oauth-client/pom.xml b/oauth-client/pom.xml
index 122a9d893b..50ccb21308 100644
--- a/oauth-client/pom.xml
+++ b/oauth-client/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <artifactId>pulsar-protocol-handler-kafka-parent</artifactId>
     <groupId>io.streamnative.pulsar.handlers</groupId>
-    <version>2.9.0-SNAPSHOT</version>
+    <version>2.8.1.15</version>
   </parent>
 
   <artifactId>oauth-client</artifactId>
diff --git a/pom.xml b/pom.xml
index 68bf1da23c..73042a971e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -29,7 +29,7 @@
 
   <groupId>io.streamnative.pulsar.handlers</groupId>
   <artifactId>pulsar-protocol-handler-kafka-parent</artifactId>
-  <version>2.9.0-SNAPSHOT</version>
+  <version>2.8.1.15</version>
   <name>StreamNative :: Pulsar Protocol Handler :: KoP Parent</name>
   <description>Parent for Kafka on Pulsar implemented using Pulsar Protocol Handler.</description>
 
@@ -46,7 +46,7 @@
     <lombok.version>1.18.4</lombok.version>
     <mockito.version>2.22.0</mockito.version>
     <pulsar.group.id>io.streamnative</pulsar.group.id>
-    <pulsar.version>2.8.0.15</pulsar.version>
+    <pulsar.version>2.8.1.15</pulsar.version>
     <slf4j.version>1.7.25</slf4j.version>
     <spotbugs-annotations.version>3.1.8</spotbugs-annotations.version>
     <testcontainers.version>1.15.1</testcontainers.version>
diff --git a/tests/pom.xml b/tests/pom.xml
index 17917689b5..3cf1a1315f 100644
--- a/tests/pom.xml
+++ b/tests/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>io.streamnative.pulsar.handlers</groupId>
     <artifactId>pulsar-protocol-handler-kafka-parent</artifactId>
-    <version>2.9.0-SNAPSHOT</version>
+    <version>2.8.1.15</version>
   </parent>
 
   <groupId>io.streamnative.pulsar.handlers</groupId>
@@ -39,12 +39,12 @@
     <dependency>
       <groupId>io.streamnative.pulsar.handlers</groupId>
       <artifactId>kafka-client-api</artifactId>
-      <version>2.9.0-SNAPSHOT</version>
+      <version>2.8.1.15</version>
     </dependency>
     <dependency>
       <groupId>io.streamnative.pulsar.handlers</groupId>
       <artifactId>kafka-client-factory</artifactId>
-      <version>2.9.0-SNAPSHOT</version>
+      <version>2.8.1.15</version>
     </dependency>
     <dependency>
       <groupId>org.apache.kafka</groupId>