diff --git a/eco-api/src/main/kotlin/com/willfp/eco/core/map/DefaultMap.kt b/eco-api/src/main/kotlin/com/willfp/eco/core/map/DefaultMap.kt
index 8754a4b5..bfd9a051 100644
--- a/eco-api/src/main/kotlin/com/willfp/eco/core/map/DefaultMap.kt
+++ b/eco-api/src/main/kotlin/com/willfp/eco/core/map/DefaultMap.kt
@@ -8,7 +8,7 @@ package com.willfp.eco.core.map
  * @see ListMap
  */
 @Suppress("RedundantOverride")
-class MutableListMap<K : Any, V : Any> : ListMap<K, V>() {
+class MutableListMap<K : Any, V> : ListMap<K, V>() {
     /**
      * Override with enforced MutableList type.
      */
@@ -18,7 +18,7 @@ class MutableListMap<K : Any, V : Any> : ListMap<K, V>() {
     /**
      * Override with enforced MutableList type.
      */
-    override fun getOrDefault(key: K, defaultValue: MutableList<V>?): MutableList<V> {
+    override fun getOrDefault(key: K, defaultValue: MutableList<V>): MutableList<V> {
         return super.getOrDefault(key, defaultValue)
     }
 }
@@ -44,13 +44,13 @@ fun <K : Any, V : Any> listMap() =
 /**
  * @see DefaultMap.createNestedMap
  */
-fun <K : Any, K1 : Any, V : Any> nestedMap() =
+fun <K : Any, K1 : Any, V> nestedMap() =
     DefaultMap.createNestedMap<K, K1, V>()
 
 /**
  * @see DefaultMap.createNestedListMap
  */
-fun <K : Any, K1 : Any, V : Any> nestedListMap() =
+fun <K : Any, K1 : Any, V> nestedListMap() =
     DefaultMap<K, MutableListMap<K1, V>>() {
         MutableListMap()
     }
diff --git a/gradle.properties b/gradle.properties
index 8a209d93..5b405e07 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,3 @@
-version = 6.59.1
+version = 6.60.0
 plugin-name = eco
 kotlin.code.style = official
\ No newline at end of file