diff --git a/.sdk-version b/.sdk-version
index 8a5b818..1defe53 100644
--- a/.sdk-version
+++ b/.sdk-version
@@ -1 +1 @@
-v2.0.4
+v2.1.0
diff --git a/README.md b/README.md
index fe747f6..a184c5a 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ Add this dependency to your project's POM:
 <dependency>
     <groupId>ai.reveng</groupId>
     <artifactId>sdk</artifactId>
-    <version>2.0.4</version>
+    <version>2.1.0</version>
     <scope>compile</scope>
 </dependency>
 ```
@@ -31,7 +31,7 @@ repositories {
 }
 
 dependencies {
-    implementation "ai.reveng:sdk:2.0.4"
+    implementation "ai.reveng:sdk:2.1.0"
 }
 ```
 
diff --git a/build.gradle b/build.gradle
index 0959728..fbbecfc 100644
--- a/build.gradle
+++ b/build.gradle
@@ -19,7 +19,7 @@ apply plugin: 'java'
 apply plugin: 'com.diffplug.spotless'
 
 group = 'ai.reveng'
-version = '2.0.4'
+version = '2.1.0'
 
 
 
@@ -171,7 +171,7 @@ mavenPublishing {
     publishToMavenCentral(true)
     signAllPublications()
 
-    coordinates("ai.reveng", "sdk", "2.0.4")
+    coordinates("ai.reveng", "sdk", "2.1.0")
 
     pom {
         name = "sdk"
diff --git a/build.sbt b/build.sbt
index d096f03..6d60368 100644
--- a/build.sbt
+++ b/build.sbt
@@ -2,7 +2,7 @@ lazy val root = (project in file(".")).
   settings(
     organization := "ai.reveng",
     name := "sdk",
-    version := "2.0.4",
+    version := "2.1.0",
     scalaVersion := "2.11.12",
     scalacOptions ++= Seq("-feature"),
     compile / javacOptions ++= Seq("-Xlint:deprecation"),
diff --git a/docs/AppApiRestV2FunctionsResponsesFunction.md b/docs/AppApiRestV2FunctionsResponsesFunction.md
index 6d9bbd8..be7aeb0 100644
--- a/docs/AppApiRestV2FunctionsResponsesFunction.md
+++ b/docs/AppApiRestV2FunctionsResponsesFunction.md
@@ -8,7 +8,7 @@ Function schema used in function strings response.
 
 | Name | Type | Description | Notes |
 |------------ | ------------- | ------------- | -------------|
-|**functionId** | **Integer** |  |  |
+|**functionId** | **Integer** |  |  [optional] |
 |**functionVaddr** | **Long** | Function virtual address |  |
 
 
diff --git a/pom.xml b/pom.xml
index 5815d3e..e59f99a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
     <artifactId>sdk</artifactId>
     <packaging>jar</packaging>
     <name>sdk</name>
-    <version>2.0.4</version>
+    <version>2.1.0</version>
     <url>https://github.com/RevEngAI/sdk-java</url>
     <description>Java SDK for the RevEng.AI API</description>
     <scm>
diff --git a/src/main/java/ai/reveng/invoker/ApiClient.java b/src/main/java/ai/reveng/invoker/ApiClient.java
index 8a2b67d..6206715 100644
--- a/src/main/java/ai/reveng/invoker/ApiClient.java
+++ b/src/main/java/ai/reveng/invoker/ApiClient.java
@@ -140,7 +140,7 @@ protected void init() {
         json = new JSON();
 
         // Set default User-Agent.
-        setUserAgent("OpenAPI-Generator/2.0.4/java");
+        setUserAgent("OpenAPI-Generator/2.1.0/java");
 
         authentications = new HashMap<String, Authentication>();
     }
diff --git a/src/main/java/ai/reveng/invoker/Configuration.java b/src/main/java/ai/reveng/invoker/Configuration.java
index cf7dbd9..cfb5acf 100644
--- a/src/main/java/ai/reveng/invoker/Configuration.java
+++ b/src/main/java/ai/reveng/invoker/Configuration.java
@@ -18,7 +18,7 @@
 
 @javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen")
 public class Configuration {
-  public static final String VERSION = "2.0.4";
+  public static final String VERSION = "2.1.0";
 
   private static final AtomicReference<ApiClient> defaultApiClient = new AtomicReference<>();
   private static volatile Supplier<ApiClient> apiClientFactory = ApiClient::new;
diff --git a/src/main/java/ai/reveng/model/AppApiRestV2FunctionsResponsesFunction.java b/src/main/java/ai/reveng/model/AppApiRestV2FunctionsResponsesFunction.java
index c13c8af..5758624 100644
--- a/src/main/java/ai/reveng/model/AppApiRestV2FunctionsResponsesFunction.java
+++ b/src/main/java/ai/reveng/model/AppApiRestV2FunctionsResponsesFunction.java
@@ -21,6 +21,7 @@
 import com.google.gson.stream.JsonWriter;
 import java.io.IOException;
 import java.util.Arrays;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
@@ -53,7 +54,7 @@
 public class AppApiRestV2FunctionsResponsesFunction {
   public static final String SERIALIZED_NAME_FUNCTION_ID = "function_id";
   @SerializedName(SERIALIZED_NAME_FUNCTION_ID)
-  @javax.annotation.Nonnull
+  @javax.annotation.Nullable
   private Integer functionId;
 
   public static final String SERIALIZED_NAME_FUNCTION_VADDR = "function_vaddr";
@@ -64,7 +65,7 @@ public class AppApiRestV2FunctionsResponsesFunction {
   public AppApiRestV2FunctionsResponsesFunction() {
   }
 
-  public AppApiRestV2FunctionsResponsesFunction functionId(@javax.annotation.Nonnull Integer functionId) {
+  public AppApiRestV2FunctionsResponsesFunction functionId(@javax.annotation.Nullable Integer functionId) {
     this.functionId = functionId;
     return this;
   }
@@ -73,12 +74,12 @@ public AppApiRestV2FunctionsResponsesFunction functionId(@javax.annotation.Nonnu
    * Get functionId
    * @return functionId
    */
-  @javax.annotation.Nonnull
+  @javax.annotation.Nullable
   public Integer getFunctionId() {
     return functionId;
   }
 
-  public void setFunctionId(@javax.annotation.Nonnull Integer functionId) {
+  public void setFunctionId(@javax.annotation.Nullable Integer functionId) {
     this.functionId = functionId;
   }
 
@@ -116,11 +117,22 @@ public boolean equals(Object o) {
         Objects.equals(this.functionVaddr, appApiRestV2FunctionsResponsesFunction.functionVaddr);
   }
 
+  private static <T> boolean equalsNullable(JsonNullable<T> a, JsonNullable<T> b) {
+    return a == b || (a != null && b != null && a.isPresent() && b.isPresent() && Objects.deepEquals(a.get(), b.get()));
+  }
+
   @Override
   public int hashCode() {
     return Objects.hash(functionId, functionVaddr);
   }
 
+  private static <T> int hashCodeNullable(JsonNullable<T> a) {
+    if (a == null) {
+      return 1;
+    }
+    return a.isPresent() ? Arrays.deepHashCode(new Object[]{a.get()}) : 31;
+  }
+
   @Override
   public String toString() {
     StringBuilder sb = new StringBuilder();
@@ -151,7 +163,7 @@ private String toIndentedString(Object o) {
     openapiFields = new HashSet<String>(Arrays.asList("function_id", "function_vaddr"));
 
     // a set of required properties/fields (JSON key names)
-    openapiRequiredFields = new HashSet<String>(Arrays.asList("function_id", "function_vaddr"));
+    openapiRequiredFields = new HashSet<String>(Arrays.asList("function_vaddr"));
   }
 
   /**
diff --git a/src/test/java/ai/reveng/model/AppApiRestV2FunctionsResponsesFunctionTest.java b/src/test/java/ai/reveng/model/AppApiRestV2FunctionsResponsesFunctionTest.java
index 57550e5..4221799 100644
--- a/src/test/java/ai/reveng/model/AppApiRestV2FunctionsResponsesFunctionTest.java
+++ b/src/test/java/ai/reveng/model/AppApiRestV2FunctionsResponsesFunctionTest.java
@@ -19,6 +19,7 @@
 import com.google.gson.stream.JsonWriter;
 import java.io.IOException;
 import java.util.Arrays;
+import org.openapitools.jackson.nullable.JsonNullable;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;