diff --git a/pom.xml b/pom.xml
index 575e0f0..3f494a9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -75,7 +75,7 @@
 			<plugin>
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>sonar-maven-plugin</artifactId>
-				<version>2.6</version>
+				<version>3.0.2</version>
 			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
@@ -114,7 +114,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-site-plugin</artifactId>
-				<version>3.4</version>
+				<version>3.5.1</version>
 			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
diff --git a/src/main/java/de/svenkubiak/jpushover/JPushover.java b/src/main/java/de/svenkubiak/jpushover/JPushover.java
index df81e02..2b3fd15 100644
--- a/src/main/java/de/svenkubiak/jpushover/JPushover.java
+++ b/src/main/java/de/svenkubiak/jpushover/JPushover.java
@@ -250,7 +250,7 @@ public class JPushover {
             final HttpResponse httpResponse = Request.Post(Constants.VALIDATION_URL.toString()).bodyForm(params, Consts.UTF_8).execute().returnResponse();
 
             if (httpResponse != null && httpResponse.getStatusLine().getStatusCode() == HTTP_OK) {
-                final String response = IOUtils.toString(httpResponse.getEntity().getContent());
+                final String response = IOUtils.toString(httpResponse.getEntity().getContent(), Consts.UTF_8);
                 if (StringUtils.isNotBlank(response) && response.contains("\"status\":1")) {
                     valid = true;
                 }