diff --git a/java/pom.xml b/java/pom.xml
index 1a3e827..88bdc17 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -57,7 +57,7 @@
         <reactor-version>3.4.2</reactor-version>
         <reactor-netty-version>1.0.3</reactor-netty-version>
         <reactor-netty-ipc-version>0.7.15.RELEASE</reactor-netty-ipc-version>
-        <netty-version>4.1.58.Final</netty-version>
+        <netty-version>4.1.59.Final</netty-version>
         <testng.version>7.3.0</testng.version>
         <mock-server.version>5.11.2</mock-server.version>
     </properties>
diff --git a/java/src/main/java/com/ibm/watson/data/client/api/CategoriesApiV3.java b/java/src/main/java/com/ibm/watson/data/client/api/CategoriesApiV3.java
index 4c71696..851282d 100644
--- a/java/src/main/java/com/ibm/watson/data/client/api/CategoriesApiV3.java
+++ b/java/src/main/java/com/ibm/watson/data/client/api/CategoriesApiV3.java
@@ -400,7 +400,7 @@ public Mono<Category> get(@NonNull String guid,
      */
     public Mono<Category> get(@NonNull String guid,
                               String runAsTenant,
-                              boolean includeRelationships) throws RestClientException {
+                              Boolean includeRelationships) throws RestClientException {
 
         // create path and map variables
         final Map<String, Object> pathParams = new HashMap<>();
@@ -412,7 +412,9 @@ public Mono<Category> get(@NonNull String guid,
         final MultiValueMap<String, String> cookieParams = new LinkedMultiValueMap<>();
         final MultiValueMap<String, Object> formParams = new LinkedMultiValueMap<>();
 
-        queryParams.putAll(apiClient.parameterToMultiValueMap(null, "include_relationships", includeRelationships));
+        if (includeRelationships != null) {
+            queryParams.putAll(apiClient.parameterToMultiValueMap(null, "include_relationships", includeRelationships));
+        }
 
         if (runAsTenant != null)
             headerParams.add("Run-As-Tenant", apiClient.parameterToString(runAsTenant));