diff --git a/01_wallet_rpc/erc-token/pom.xml b/01_wallet_rpc/erc-token/pom.xml
index bdf0868b..456e207c 100644
--- a/01_wallet_rpc/erc-token/pom.xml
+++ b/01_wallet_rpc/erc-token/pom.xml
@@ -59,7 +59,7 @@
         <dependency>
             <groupId>com.github.briandilley.jsonrpc4j</groupId>
             <artifactId>jsonrpc4j</artifactId>
-            <version>1.4.6</version>
+            <version>1.6</version>
         </dependency>
         <dependency>
             <groupId>org.projectlombok</groupId>
diff --git a/01_wallet_rpc/pom.xml b/01_wallet_rpc/pom.xml
index 4cce4db5..377cb706 100644
--- a/01_wallet_rpc/pom.xml
+++ b/01_wallet_rpc/pom.xml
@@ -60,7 +60,7 @@
             <dependency>
                 <groupId>org.web3j</groupId>
                 <artifactId>core</artifactId>
-                <version>3.3.1</version>
+                <version>4.0.0</version>
             </dependency>
             <dependency>
                 <groupId>org.springframework.boot</groupId>
@@ -93,7 +93,7 @@
             <dependency>
                 <groupId>org.web3j</groupId>
                 <artifactId>core</artifactId>
-                <version>3.3.1</version>
+                <version>4.0.0</version>
             </dependency>
             <dependency>
                 <groupId>com.mashape.unirest</groupId>