diff --git a/pom.xml b/pom.xml
index 0a49338..0095180 100644
--- a/pom.xml
+++ b/pom.xml
@@ -59,33 +59,33 @@
     <dependency>
       <groupId>io.netty</groupId>
       <artifactId>netty-common</artifactId>
-      <version>${netty.version}</version>
+      <version>4.1.118.Final</version>
     </dependency>
     <dependency>
       <groupId>io.netty</groupId>
       <artifactId>netty-buffer</artifactId>
-      <version>${netty.version}</version>
+      <version>4.1.118.Final</version>
     </dependency>
     <dependency>
       <groupId>io.netty</groupId>
       <artifactId>netty-transport</artifactId>
-      <version>${netty.version}</version>
+      <version>4.1.118.Final</version>
     </dependency>
     <dependency>
       <groupId>io.netty</groupId>
       <artifactId>netty-handler</artifactId>
-      <version>${netty.version}</version>
+      <version>4.1.112.Final</version>
     </dependency>
     <dependency>
       <groupId>io.netty</groupId>
       <artifactId>netty-codec-http</artifactId>
-      <version>${netty.version}</version>
+      <version>4.1.118.Final</version>
     </dependency>
 
     <dependency>
       <groupId>com.alibaba.fastjson2</groupId>
       <artifactId>fastjson2</artifactId>
-      <version>${fastjson.version}</version>
+      <version>2.0.53.android8</version>
     </dependency>
 
     <!-- Apache SSHD -->
@@ -110,7 +110,7 @@
     <dependency>
       <groupId>org.bouncycastle</groupId>
       <artifactId>bcprov-jdk15on</artifactId>
-      <version>1.66</version>
+      <version>1.67</version>
       <optional>true</optional>
     </dependency>
     <dependency>
@@ -123,7 +123,7 @@
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
-      <version>${version.org.slf4j}</version>
+      <version>1.7.21</version>
       <optional>true</optional>
     </dependency>
 
@@ -136,19 +136,19 @@
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-simple</artifactId>
-      <version>${version.org.slf4j}</version>
+      <version>1.7.21</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>commons-net</groupId>
       <artifactId>commons-net</artifactId>
-      <version>3.3</version>
+      <version>3.9.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>io.undertow</groupId>
       <artifactId>undertow-core</artifactId>
-      <version>1.2.6.Final</version>
+      <version>2.2.36.Final</version>
       <scope>test</scope>
     </dependency>
     <dependency>
@@ -166,13 +166,13 @@
     <dependency>
       <groupId>com.jcraft</groupId>
       <artifactId>jsch</artifactId>
-      <version>0.1.53</version>
+      <version>0.1.54</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.mina</groupId>
       <artifactId>mina-core</artifactId>
-      <version>2.0.9</version>
+      <version>2.0.27</version>
       <scope>test</scope>
     </dependency>
     <dependency>
@@ -466,7 +466,7 @@
         <dependency>
           <groupId>org.slf4j</groupId>
           <artifactId>slf4j-simple</artifactId>
-          <version>${version.org.slf4j}</version>
+          <version>1.7.21</version>
           <optional>true</optional>
         </dependency>
       </dependencies>
@@ -552,7 +552,7 @@
         <dependency>
           <groupId>org.slf4j</groupId>
           <artifactId>slf4j-simple</artifactId>
-          <version>${version.org.slf4j}</version>
+          <version>1.7.21</version>
           <optional>true</optional>
         </dependency>
       </dependencies>
@@ -638,7 +638,7 @@
         <dependency>
           <groupId>org.slf4j</groupId>
           <artifactId>slf4j-simple</artifactId>
-          <version>${version.org.slf4j}</version>
+          <version>1.7.21</version>
           <optional>true</optional>
         </dependency>
       </dependencies>
@@ -725,7 +725,7 @@
         <dependency>
           <groupId>org.slf4j</groupId>
           <artifactId>slf4j-simple</artifactId>
-          <version>${version.org.slf4j}</version>
+          <version>1.7.21</version>
           <optional>true</optional>
         </dependency>
       </dependencies>