diff --git a/pom.xml b/pom.xml
index 2def4ca..1892d31 100644
--- a/pom.xml
+++ b/pom.xml
@@ -48,26 +48,26 @@
         <dependency>
             <groupId>org.bouncycastle</groupId>
             <artifactId>bcprov-jdk15on</artifactId>
-            <version>1.60</version>
+            <version>1.61</version>
         </dependency>
 
         <dependency>
             <groupId>org.web3j</groupId>
             <artifactId>crypto</artifactId>
-            <version>3.6.0</version>
+            <version>4.0.0</version>
         </dependency>
 
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.8.5</version>
+            <version>2.8.9</version>
         </dependency>
 
         <!-- https://mvnrepository.com/artifact/com.squareup.okhttp3/okhttp -->
         <dependency>
             <groupId>com.squareup.okhttp3</groupId>
             <artifactId>okhttp</artifactId>
-            <version>3.12.0</version>
+            <version>4.12.0</version>
         </dependency>