diff --git a/pom.xml b/pom.xml
index b3d7d16..39c9fe7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -40,7 +40,7 @@
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>
             <artifactId>httpclient</artifactId>
-            <version>4.4</version>
+            <version>4.5.13</version>
         </dependency>
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>
@@ -50,7 +50,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.3.1</version>
+            <version>2.8.9</version>
         </dependency>
         <dependency>
             <groupId>org.apache.commons</groupId>
@@ -60,13 +60,13 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.12</version>
+            <version>4.13.1</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.bouncycastle</groupId>
             <artifactId>bcprov-jdk15on</artifactId>
-            <version>1.54</version>
+            <version>1.66</version>
         </dependency>
         <dependency>
             <groupId>org.apache.commons</groupId>