diff --git a/build.gradle b/build.gradle
index 816efd33d..15b15cd0c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -62,7 +62,7 @@ test {
 }
 
 dependencies {
-    implementation 'com.squareup.okhttp3:okhttp:3.14.9'
+    implementation 'com.squareup.okhttp3:okhttp:4.9.0'
     implementation 'com.squareup.okhttp3:logging-interceptor:3.14.9'
     implementation 'com.fasterxml.jackson.core:jackson-databind:2.11.3'
     implementation 'commons-codec:commons-codec:1.15'
@@ -70,7 +70,7 @@ dependencies {
 
     testImplementation 'org.bouncycastle:bcprov-jdk15on:1.65'
     testImplementation 'org.mockito:mockito-core:2.28.2'
-    testImplementation 'com.squareup.okhttp3:mockwebserver:3.14.9'
+    testImplementation 'com.squareup.okhttp3:mockwebserver:4.9.0'
     testImplementation 'org.hamcrest:hamcrest-core:1.3'
     testImplementation 'org.hamcrest:hamcrest-library:1.3'
     testImplementation 'junit:junit:4.13.1'
diff --git a/src/main/java/com/auth0/net/CustomRequest.java b/src/main/java/com/auth0/net/CustomRequest.java
index ca1e0acd9..4e61ba4b8 100644
--- a/src/main/java/com/auth0/net/CustomRequest.java
+++ b/src/main/java/com/auth0/net/CustomRequest.java
@@ -47,7 +47,7 @@ protected RequestBody createRequestBody() throws IOException {
             return null;
         }
         byte[] jsonBody = mapper.writeValueAsBytes(body != null ? body : parameters);
-        return RequestBody.create(MediaType.parse(CONTENT_TYPE_APPLICATION_JSON), jsonBody);
+        return RequestBody.create(jsonBody, MediaType.parse(CONTENT_TYPE_APPLICATION_JSON));
     }
 
     @Override
diff --git a/src/main/java/com/auth0/net/EmptyBodyRequest.java b/src/main/java/com/auth0/net/EmptyBodyRequest.java
index 610df46cc..8a199ebc0 100644
--- a/src/main/java/com/auth0/net/EmptyBodyRequest.java
+++ b/src/main/java/com/auth0/net/EmptyBodyRequest.java
@@ -19,7 +19,7 @@ public EmptyBodyRequest(OkHttpClient client, String url, String method, TypeRefe
 
     @Override
     protected RequestBody createRequestBody() {
-        return RequestBody.create(null, new byte[0]);
+        return RequestBody.create(new byte[0], null);
     }
 
     @Override
diff --git a/src/main/java/com/auth0/net/MultipartRequest.java b/src/main/java/com/auth0/net/MultipartRequest.java
index 44217908d..d4e91313d 100644
--- a/src/main/java/com/auth0/net/MultipartRequest.java
+++ b/src/main/java/com/auth0/net/MultipartRequest.java
@@ -79,7 +79,7 @@ public MultipartRequest<T> addPart(String name, File file, String mediaType) {
             throw new IllegalArgumentException("Failed to add part because the file specified cannot be found.");
         }
         bodyBuilder.addFormDataPart(name, file.getName(),
-                RequestBody.create(MediaType.parse(mediaType), file));
+                RequestBody.create(file, MediaType.parse(mediaType)));
         partsCount++;
         return this;
     }