diff --git a/pom.xml b/pom.xml
index c897d8e1..6fd96846 100644
--- a/pom.xml
+++ b/pom.xml
@@ -217,11 +217,6 @@
                 </exclusion>
             </exclusions>
         </dependency>
-        <dependency>
-            <groupId>io.netty</groupId>
-            <artifactId>netty-all</artifactId>
-            <version>4.1.74.Final</version>
-        </dependency>
 
         <!-- Test dependencies -->
         <dependency>
diff --git a/sdk/src/main/java/com/silanis/esl/sdk/service/apiclient/AccountApiClient.java b/sdk/src/main/java/com/silanis/esl/sdk/service/apiclient/AccountApiClient.java
index 23579bcd..01adb601 100644
--- a/sdk/src/main/java/com/silanis/esl/sdk/service/apiclient/AccountApiClient.java
+++ b/sdk/src/main/java/com/silanis/esl/sdk/service/apiclient/AccountApiClient.java
@@ -21,7 +21,7 @@
 import com.silanis.esl.sdk.internal.RestClient;
 import com.silanis.esl.sdk.internal.Serialization;
 import com.silanis.esl.sdk.internal.UrlTemplate;
-import io.netty.util.internal.StringUtil;
+import org.apache.commons.lang3.StringUtils;
 
 import javax.xml.ws.Response;
 import java.util.Collections;
@@ -410,7 +410,7 @@ public List<String> getAccountRoleUsers(String accountRoleId) {
     }
 
     public List<UserAccountRole> getAssignedAccountRoles(String userId, String accountId) {
-        if (!StringUtil.isNullOrEmpty(accountId)){
+        if (!StringUtils.isEmpty(accountId)){
             template.addParam("accountId", accountId);
         }
         String path = template.urlFor(UrlTemplate.ACCOUNT_SENDERS_ROLES_PATH)