diff --git a/build.gradle.kts b/build.gradle.kts
index e0e5a0a1..a5f25b46 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -13,7 +13,7 @@ group = "com.comphenix.protocol"
 version = "5.4.0-SNAPSHOT"
 description = "Provides access to the Minecraft protocol"
 
-val mcVersion = "1.21.2"
+val mcVersion = "1.21.3"
 val isSnapshot = version.toString().endsWith("-SNAPSHOT")
 val buildNumber = System.getenv("BUILD_NUMBER") ?: ""
 val isJenkins = buildNumber.isNotEmpty()
@@ -26,11 +26,11 @@ repositories {
     mavenCentral()
 
     maven {
-        url = uri("https://repo.dmulloy2.net/repository/public/")
+        url = uri("https://repo.codemc.io/repository/nms/")
     }
 
     maven {
-        url = uri("https://repo.codemc.io/repository/nms/")
+        url = uri("https://repo.dmulloy2.net/repository/public/")
     }
 
     maven {
diff --git a/src/test/java/com/comphenix/protocol/wrappers/WrappedRegistrableTest.java b/src/test/java/com/comphenix/protocol/wrappers/WrappedRegistrableTest.java
index ebbfa37a..1354e334 100644
--- a/src/test/java/com/comphenix/protocol/wrappers/WrappedRegistrableTest.java
+++ b/src/test/java/com/comphenix/protocol/wrappers/WrappedRegistrableTest.java
@@ -26,7 +26,7 @@ void testRegistrables() {
         // some randomly selected registrables which we can prove that work using the bukkit api
         validate(MinecraftReflection.getEntityTypes(), EntityType.WARDEN.getKey());
         validate(MinecraftReflection.getItemClass(), Material.DIAMOND_AXE.getKey());
-        validate(MinecraftReflection.getAttributeBase(), Attribute.GENERIC_MAX_HEALTH.getKey());
+        validate(MinecraftReflection.getAttributeBase(), Attribute.MAX_HEALTH.getKey());
         validate(MinecraftReflection.getSoundEffectClass(), Sound.ENTITY_WARDEN_SNIFF.getKey());
         validate(MinecraftReflection.getMobEffectListClass(), PotionEffectType.REGENERATION.getKey());
     }
diff --git a/src/test/java/com/comphenix/protocol/wrappers/WrappedRegistryTest.java b/src/test/java/com/comphenix/protocol/wrappers/WrappedRegistryTest.java
index 1a2cb741..5552c15a 100644
--- a/src/test/java/com/comphenix/protocol/wrappers/WrappedRegistryTest.java
+++ b/src/test/java/com/comphenix/protocol/wrappers/WrappedRegistryTest.java
@@ -26,7 +26,7 @@ void testRegistries() {
         // some randomly selected registries which we can proof to work using the bukkit api
         validate(MinecraftReflection.getEntityTypes(), EntityType.WARDEN.getKey());
         validate(MinecraftReflection.getItemClass(), Material.DIAMOND_AXE.getKey());
-        validate(MinecraftReflection.getAttributeBase(), Attribute.GENERIC_MAX_HEALTH.getKey());
+        validate(MinecraftReflection.getAttributeBase(), Attribute.MAX_HEALTH.getKey());
         validate(MinecraftReflection.getSoundEffectClass(), Sound.ENTITY_WARDEN_SNIFF.getKey());
         validate(MinecraftReflection.getMobEffectListClass(), PotionEffectType.REGENERATION.getKey());
     }