diff --git a/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoJSONConfigWrapper.kt b/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoJSONConfigWrapper.kt
index d314812f..1e41e6f5 100644
--- a/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoJSONConfigWrapper.kt
+++ b/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoJSONConfigWrapper.kt
@@ -6,14 +6,15 @@ import com.willfp.eco.core.config.interfaces.JSONConfig
 import com.willfp.eco.util.StringUtils
 import org.apache.commons.lang.Validate
 import java.util.*
+import java.util.concurrent.ConcurrentHashMap
 
 @Suppress("UNCHECKED_CAST")
 open class EcoJSONConfigWrapper : JSONConfig {
     val handle: Gson = GsonBuilder().setPrettyPrinting().create()
 
-    val values = mutableMapOf<String, Any?>()
+    val values = ConcurrentHashMap<String, Any?>()
 
-    private val cache = mutableMapOf<String, Any>()
+    private val cache = ConcurrentHashMap<String, Any>()
 
     fun init(values: Map<String, Any?>) {
         this.values.clear()
diff --git a/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoYamlConfigWrapper.kt b/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoYamlConfigWrapper.kt
index c8bb7186..5b60f78e 100644
--- a/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoYamlConfigWrapper.kt
+++ b/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoYamlConfigWrapper.kt
@@ -6,11 +6,12 @@ import org.apache.commons.lang.Validate
 import org.bukkit.configuration.ConfigurationSection
 import org.bukkit.configuration.file.YamlConfiguration
 import java.io.StringReader
+import java.util.concurrent.ConcurrentHashMap
 
 @Suppress("UNCHECKED_CAST")
 open class EcoYamlConfigWrapper<T : ConfigurationSection> : Config {
     lateinit var handle: T
-    private val cache = mutableMapOf<String, Any?>()
+    private val cache = ConcurrentHashMap<String, Any?>()
 
     protected fun init(config: T): Config {
         handle = config