diff --git a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/commands/CommandGive.kt b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/commands/CommandGive.kt
index 2bd8392..e564792 100644
--- a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/commands/CommandGive.kt
+++ b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/commands/CommandGive.kt
@@ -87,7 +87,7 @@ class CommandGive(plugin: EcoPlugin) :
 
     override fun getTabCompleter(): TabCompleteHandler {
         return TabCompleteHandler { _, args ->
-            val completions: MutableList<String> = ArrayList()
+            val completions = mutableListOf<String>()
 
             if (args.size == 1) {
                 StringUtil.copyPartialMatches(
@@ -116,7 +116,7 @@ class CommandGive(plugin: EcoPlugin) :
                 return@TabCompleteHandler completions
             }
 
-            return@TabCompleteHandler mutableListOf<String>()
+            return@TabCompleteHandler emptyList<String>()
         }
     }
 }
\ No newline at end of file
diff --git a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/commands/CommandReset.kt b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/commands/CommandReset.kt
index 26fd8c3..ecdee00 100644
--- a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/commands/CommandReset.kt
+++ b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/commands/CommandReset.kt
@@ -63,7 +63,7 @@ class CommandReset(plugin: EcoPlugin) :
                 return@TabCompleteHandler completions
             }
 
-            return@TabCompleteHandler mutableListOf<String>()
+            return@TabCompleteHandler emptyList<String>()
         }
     }
 }
\ No newline at end of file
diff --git a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/skills/Skill.kt b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/skills/Skill.kt
index 9ccafd2..277da71 100644
--- a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/skills/Skill.kt
+++ b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/skills/Skill.kt
@@ -34,7 +34,7 @@ abstract class Skill(
 
     init {
         config = SkillConfig(this.id, this.javaClass, plugin)
-        rewards = ArrayList()
+        rewards = mutableListOf()
 
         Skills.registerNewSkill(this)
     }
diff --git a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/skills/SkillGUI.kt b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/skills/SkillGUI.kt
index b66f406..a2a6ee7 100644
--- a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/skills/SkillGUI.kt
+++ b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecoskills/skills/SkillGUI.kt
@@ -44,7 +44,7 @@ class SkillGUI(
         ).addLoreLines {
             val currentXP = player.getSkillProgress(skill)
             val requiredXP = skill.getExpForLevel(player.getSkillLevel(skill) + 1)
-            val lore: MutableList<String> = ArrayList()
+            val lore = mutableListOf<String>()
             for (string in plugin.configYml.getStrings("gui.skill-icon.lore", false)) {
                 lore.add(
                     StringUtils.format(
@@ -169,8 +169,8 @@ class SkillGUI(
                                 val slotLevel = ((page - 1) * levelsPerPage) + level
 
                                 val meta = item.itemMeta!!
-                                meta.lore = ArrayList()
-                                val lore: MutableList<String> = ArrayList()
+                                meta.lore = emptyList()
+                                val lore = mutableListOf<String>()
 
                                 item.amount = 1