diff --git a/build.gradle.kts b/build.gradle.kts
index 4168848..cdc5fe7 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -7,7 +7,7 @@ plugins {
 }
 
 dependencies {
-    compileOnly("com.alttd:Galaxy-API:1.20.4-R0.1-SNAPSHOT") {
+    compileOnly("com.alttd.cosmos:cosmos-api:1.21.6-R0.1-SNAPSHOT") {
         isChanging = true
     }
 }
@@ -18,7 +18,7 @@ description = "AltitudeAPI"
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(17))
+        languageVersion.set(JavaLanguageVersion.of(21))
     }
 }