diff --git a/.gitignore b/.gitignore
index 3c37caf..515ff89 100644
--- a/.gitignore
+++ b/.gitignore
@@ -116,3 +116,5 @@ run/
 
 # Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
 !gradle-wrapper.jar
+
+gradle.properties
diff --git a/build.gradle b/build.gradle
index d1f5051..387211a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,7 +1,7 @@
 plugins {
     id 'java'
-    id 'com.github.johnrengelman.shadow' version '8.1.1'
-    id 'xyz.jpenilla.run-paper' version '2.3.0'
+    id 'com.gradleup.shadow' version '8.3.3'
+    id 'xyz.jpenilla.run-paper' version '2.3.1'
 }
 
 group = 'org.infotoast'
@@ -24,13 +24,14 @@ repositories {
 }
 
 dependencies {
-    compileOnly 'io.papermc.paper:paper-api:1.20.4-R0.1-SNAPSHOT'
-    implementation 'de.tr7zw:item-nbt-api:2.12.4'
+    compileOnly 'io.papermc.paper:paper-api:1.21.1-R0.1-SNAPSHOT'
+    implementation 'de.tr7zw:item-nbt-api:2.13.2'
 }
 
-def targetJavaVersion = 17
+def targetJavaVersion = 21
 java {
     def javaVersion = JavaVersion.toVersion(targetJavaVersion)
+    toolchain.languageVersion.set(JavaLanguageVersion.of(21))
     sourceCompatibility = javaVersion
     targetCompatibility = javaVersion
     if (JavaVersion.current() < javaVersion) {
@@ -55,7 +56,7 @@ processResources {
 
 tasks {
     runServer {
-        minecraftVersion("1.20.6")
+        minecraftVersion("1.21.1")
     }
 }
 
diff --git a/src/main/resources/EasyTrees.zip b/src/main/resources/EasyTrees.zip
index 1acc5be..ec9740d 100644
Binary files a/src/main/resources/EasyTrees.zip and b/src/main/resources/EasyTrees.zip differ