diff --git a/pom.xml b/pom.xml
index c63fdcb..953a90f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -71,7 +71,7 @@
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>
             <artifactId>httpcore</artifactId>
-            <version>4.4.7</version>
+            <version>4.4.8</version>
         </dependency>
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>
@@ -81,12 +81,12 @@
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-core</artifactId>
-            <version>2.9.1</version>
+            <version>2.9.2</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
-            <version>2.9.1</version>
+            <version>2.9.2</version>
         </dependency>
 
         <dependency>
@@ -104,19 +104,19 @@
         <dependency>
             <groupId>com.github.stefanbirkner</groupId>
             <artifactId>system-rules</artifactId>
-            <version>1.16.1</version>
+            <version>1.17.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.powermock</groupId>
             <artifactId>powermock-module-junit4</artifactId>
-            <version>1.7.3</version>
+            <version>2.0.0-beta.5</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.powermock</groupId>
-            <artifactId>powermock-api-mockito</artifactId>
-            <version>1.7.3</version>
+            <artifactId>powermock-api-mockito2</artifactId>
+            <version>2.0.0-beta.5</version>
             <scope>test</scope>
         </dependency>
     </dependencies>
diff --git a/src/test/java/de/stklcode/jvault/connector/HTTPVaultConnectorOfflineTest.java b/src/test/java/de/stklcode/jvault/connector/HTTPVaultConnectorOfflineTest.java
index 3a05e38..1b11068 100644
--- a/src/test/java/de/stklcode/jvault/connector/HTTPVaultConnectorOfflineTest.java
+++ b/src/test/java/de/stklcode/jvault/connector/HTTPVaultConnectorOfflineTest.java
@@ -45,8 +45,10 @@ import static org.hamcrest.CoreMatchers.nullValue;
 import static org.hamcrest.core.Is.is;
 import static org.junit.Assert.assertThat;
 import static org.junit.Assert.fail;
-import static org.mockito.Matchers.any;
-import static org.powermock.api.mockito.PowerMockito.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.when;
+import static org.powermock.api.mockito.PowerMockito.mockStatic;
 
 /**
  * JUnit test for HTTP Vault connector.