diff --git a/build.gradle b/build.gradle
index 05403606..aa4b5740 100644
--- a/build.gradle
+++ b/build.gradle
@@ -136,7 +136,7 @@ dependencies {
 
     // Tests
     testImplementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.0.21'
-    testImplementation 'com.github.seeseemelk:MockBukkit-v1.21:3.133.2'
+    testImplementation 'org.mockbukkit.mockbukkit:mockbukkit-v1.21:4.3.1'
     testImplementation('com.googlecode.json-simple:json-simple:1.1.1') {
         exclude group: 'junit', module: 'junit'
     }
diff --git a/src/test/java/org/mvplugins/multiverse/core/TestWithMockBukkit.kt b/src/test/java/org/mvplugins/multiverse/core/TestWithMockBukkit.kt
index f77f4d52..975d7680 100644
--- a/src/test/java/org/mvplugins/multiverse/core/TestWithMockBukkit.kt
+++ b/src/test/java/org/mvplugins/multiverse/core/TestWithMockBukkit.kt
@@ -1,7 +1,7 @@
 package org.mvplugins.multiverse.core
 
-import be.seeseemelk.mockbukkit.MockBukkit
 import com.dumptruckman.minecraft.util.Logging
+import org.mockbukkit.mockbukkit.MockBukkit
 import org.mvplugins.multiverse.core.inject.PluginServiceLocator
 import org.mvplugins.multiverse.core.mock.MVServerMock
 import org.mvplugins.multiverse.core.utils.TestingMode
diff --git a/src/test/java/org/mvplugins/multiverse/core/commands/VersionCommandTest.kt b/src/test/java/org/mvplugins/multiverse/core/commands/VersionCommandTest.kt
index 1a0fd939..e642e883 100644
--- a/src/test/java/org/mvplugins/multiverse/core/commands/VersionCommandTest.kt
+++ b/src/test/java/org/mvplugins/multiverse/core/commands/VersionCommandTest.kt
@@ -1,8 +1,8 @@
 package org.mvplugins.multiverse.core.commands
 
-import be.seeseemelk.mockbukkit.entity.PlayerMock
 import org.bukkit.Bukkit
 import org.bukkit.ChatColor
+import org.mockbukkit.mockbukkit.entity.PlayerMock
 import org.mvplugins.multiverse.core.TestWithMockBukkit
 import kotlin.test.BeforeTest
 import kotlin.test.Test
diff --git a/src/test/java/org/mvplugins/multiverse/core/mock/MVServerMock.java b/src/test/java/org/mvplugins/multiverse/core/mock/MVServerMock.java
index ff802cc5..1ed0cb32 100644
--- a/src/test/java/org/mvplugins/multiverse/core/mock/MVServerMock.java
+++ b/src/test/java/org/mvplugins/multiverse/core/mock/MVServerMock.java
@@ -1,11 +1,11 @@
 package org.mvplugins.multiverse.core.mock;
 
-import be.seeseemelk.mockbukkit.ServerMock;
-import be.seeseemelk.mockbukkit.WorldMock;
-import be.seeseemelk.mockbukkit.command.MockCommandMap;
 import org.bukkit.World;
 import org.bukkit.WorldCreator;
 import org.jetbrains.annotations.NotNull;
+import org.mockbukkit.mockbukkit.ServerMock;
+import org.mockbukkit.mockbukkit.command.CommandMapMock;
+import org.mockbukkit.mockbukkit.world.WorldMock;
 
 import java.io.File;
 import java.io.IOException;
@@ -24,7 +24,7 @@ public class MVServerMock extends ServerMock {
 
     // This is required for acf reflection to work
     @Override
-    public @NotNull MockCommandMap getCommandMap() {
+    public @NotNull CommandMapMock getCommandMap() {
         return super.getCommandMap();
     }
 
diff --git a/src/test/java/org/mvplugins/multiverse/core/mock/MVWorldMock.java b/src/test/java/org/mvplugins/multiverse/core/mock/MVWorldMock.java
index ecff0590..2d2adfa1 100644
--- a/src/test/java/org/mvplugins/multiverse/core/mock/MVWorldMock.java
+++ b/src/test/java/org/mvplugins/multiverse/core/mock/MVWorldMock.java
@@ -1,9 +1,9 @@
 package org.mvplugins.multiverse.core.mock;
 
-import be.seeseemelk.mockbukkit.MockBukkit;
-import be.seeseemelk.mockbukkit.WorldMock;
 import org.bukkit.WorldCreator;
 import org.jetbrains.annotations.NotNull;
+import org.mockbukkit.mockbukkit.MockBukkit;
+import org.mockbukkit.mockbukkit.world.WorldMock;
 
 import java.io.File;