diff --git a/build.gradle b/build.gradle
index b83144b..286bcc0 100644
--- a/build.gradle
+++ b/build.gradle
@@ -30,7 +30,7 @@ allprojects {
 dependencies {
     implementation project(':core')
     implementation group: 'org.jetbrains', name: 'annotations', version: '20.1.0'
-    implementation 'de.tr7zw:item-nbt-api:2.13.1'
+    implementation 'de.tr7zw:item-nbt-api:2.15.5'
     compileOnly 'io.projectreactor:reactor-core:3.5.2' // Should be included in using projects.
     compileOnly 'commons-lang:commons-lang:2.6'
     compileOnly 'org.spigotmc:spigot-api:1.18.1-R0.1-SNAPSHOT'
@@ -43,7 +43,7 @@ dependencies {
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
     testImplementation project(':core')
     testImplementation group: 'org.jetbrains', name: 'annotations', version: '20.1.0'
-    testImplementation 'de.tr7zw:item-nbt-api:2.13.1'
+    testImplementation 'de.tr7zw:item-nbt-api:2.15.5'
     testImplementation 'org.spigotmc:spigot-api:1.18.1-R0.1-SNAPSHOT'
     testCompileOnly 'io.projectreactor:reactor-core:3.5.2' // Should be included in using projects.
     testCompileOnly 'commons-lang:commons-lang:2.6'
diff --git a/core/build.gradle b/core/build.gradle
index e92db1e..7aa1ca5 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -23,7 +23,7 @@ repositories {
 
 dependencies {
     implementation group: 'org.jetbrains', name: 'annotations', version: '20.1.0'
-    implementation 'de.tr7zw:item-nbt-api:2.14.1'
+    implementation 'de.tr7zw:item-nbt-api:2.15.5'
     compileOnly 'io.projectreactor:reactor-core:3.5.2' // Should be included in using projects.
     compileOnly 'commons-lang:commons-lang:2.6'
     compileOnly 'org.spigotmc:spigot-api:1.18.1-R0.1-SNAPSHOT'
diff --git a/core/src/main/java/me/zort/containr/Container.java b/core/src/main/java/me/zort/containr/Container.java
index 3f40543..f854f0a 100644
--- a/core/src/main/java/me/zort/containr/Container.java
+++ b/core/src/main/java/me/zort/containr/Container.java
@@ -40,6 +40,7 @@ public abstract class Container implements ContainerComponent {
     private final Region selection;
     private Container parent;
     private UpdateContext lastUpdateContext = null;
+    private boolean initialized = false;
 
     public Container(final int xSize, final int ySize) {
         this.containers = new ConcurrentHashMap<>();
@@ -76,6 +77,14 @@ public Container(final int xSize, final int ySize) {
      */
     @ApiStatus.OverrideOnly public void refresh(Player player) {}
 
+    protected void doInit() {
+        if (!initialized) {
+            init();
+
+            initialized = true;
+        }
+    }
+
     @ApiStatus.OverrideOnly
     public <T extends Element> Map<Integer, T> content(Class<T> clazz) {
         Map<Integer, T> content = new HashMap<>();
diff --git a/core/src/main/java/me/zort/containr/GUI.java b/core/src/main/java/me/zort/containr/GUI.java
index f630b63..5d9acea 100644
--- a/core/src/main/java/me/zort/containr/GUI.java
+++ b/core/src/main/java/me/zort/containr/GUI.java
@@ -161,7 +161,7 @@ private void initializeModel(Player p) {
                 if (initList.contains(inner)) {
                     continue;
                 }
-                inner.init();
+                inner.doInit();
                 initList.add(inner);
             }
             if(initList.size() == initSizeBef) {
@@ -204,7 +204,7 @@ public void update(@NotNull Player p, boolean clear, Class<? extends Element>...
         Objects.requireNonNull(p, "Player cannot be null");
 
         try {
-            updateContextInfo(p);
+            initializeModel(p);
             container.innerContainers().forEach(c -> c.refresh(p));
             Map<Integer, ?> content = container.content(clazz.length > 0 ? Arrays.asList(clazz) : null);
             content.keySet().forEach(slot -> {