diff --git a/apm-sniffer/apm-agent-core/pom.xml b/apm-sniffer/apm-agent-core/pom.xml
index 337e37576..95721fdcf 100644
--- a/apm-sniffer/apm-agent-core/pom.xml
+++ b/apm-sniffer/apm-agent-core/pom.xml
@@ -36,7 +36,7 @@
         <jetty.version>9.4.2.v20170220</jetty.version>
         <grpc.version>1.14.0</grpc.version>
         <guava.version>20.0</guava.version>
-        <bytebuddy.version>1.7.9</bytebuddy.version>
+        <bytebuddy.version>1.9.2</bytebuddy.version>
         <disruptor.version>3.3.6</disruptor.version>
         <apache-httpclient.version>4.5.3</apache-httpclient.version>
         <wiremock.version>2.6.0</wiremock.version>
diff --git a/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/WitnessClassFinder.java b/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/WitnessClassFinder.java
index 6e7ed101c..5c5f16018 100644
--- a/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/WitnessClassFinder.java
+++ b/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/WitnessClassFinder.java
@@ -45,7 +45,7 @@ public enum WitnessClassFinder {
         if (!poolMap.containsKey(mappingKey)) {
             synchronized (poolMap) {
                 if (!poolMap.containsKey(mappingKey)) {
-                    TypePool classTypePool = classLoader == null ? TypePool.Default.ofClassPath() : TypePool.Default.of(classLoader);
+                    TypePool classTypePool = classLoader == null ? TypePool.Default.ofBootLoader() : TypePool.Default.of(classLoader);
                     poolMap.put(mappingKey, classTypePool);
                 }
             }