diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70c0b5a7..0e3b3eb2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,10 @@
 # Changelog
+9.0.0 - 2024-04-17
+--------------------
+Decommissioned Safe Place API
+
+Replaced `NullPointerException` with `IllegalArgumentException` in `Amadeus.builder`.` Many thanks to [Sergei Prokofev](https://github.com/Sprokof) for the contribution
+
 8.1.0 - 2024-03-11
 --------------------
 Renamed the folder `referenceData` to `referencedata` to follow the Java package naming convention. Many thanks to [Gabriele Atria](https://github.com/gabbor) for the contribution
diff --git a/README.md b/README.md
index 8cc8e365..479c3ecb 100644
--- a/README.md
+++ b/README.md
@@ -14,12 +14,12 @@ This library requires Java 1.7+ and the [Gson library](https://github.com/google
 <dependency>
   <groupId>com.amadeus</groupId>
   <artifactId>amadeus-java</artifactId>
-  <version>8.1.0</version>
+  <version>9.0.0</version>
 </dependency>
 ```
 #### Gradle
 ```js
-compile "com.amadeus:amadeus-java:8.1.0"
+compile "com.amadeus:amadeus-java:9.0.0"
 ```
 
 ## Getting Started
diff --git a/gradle.properties b/gradle.properties
index 08036fbc..c925edc1 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,5 @@
 GROUP=com.amadeus
-VERSION_NAME=8.1.0
+VERSION_NAME=9.0.0
 
 POM_URL=https://github.com/amadeus4dev/amadeus-java
 POM_SCM_URL=git@github.com:amadeus4dev/amadeus-java.git
diff --git a/src/main/java/com/amadeus/Amadeus.java b/src/main/java/com/amadeus/Amadeus.java
index b58e3912..326db559 100644
--- a/src/main/java/com/amadeus/Amadeus.java
+++ b/src/main/java/com/amadeus/Amadeus.java
@@ -24,7 +24,7 @@ public class Amadeus extends HTTPClient {
   /**
    * The API version.
    */
-  public static final String VERSION = "8.1.0";
+  public static final String VERSION = "9.0.0";
 
   /**
    * <p>
diff --git a/src/test/java/com/amadeus/AmadeusTest.java b/src/test/java/com/amadeus/AmadeusTest.java
index 26a1a279..1dc4e18c 100644
--- a/src/test/java/com/amadeus/AmadeusTest.java
+++ b/src/test/java/com/amadeus/AmadeusTest.java
@@ -62,7 +62,7 @@ public void testBuilderWithInvalidEnvironment() {
   }
 
   @Test public void testVersion() {
-    assertEquals(Amadeus.VERSION, "8.1.0", "should have a version number");
+    assertEquals(Amadeus.VERSION, "9.0.0", "should have a version number");
   }
 
 }