diff --git a/src/main/kotlin/com/mairwunnx/randomteleport/managers/ConfigurationManager.kt b/src/main/kotlin/com/mairwunnx/randomteleport/managers/ConfigurationManager.kt
index 2fff0ae..975b1a3 100644
--- a/src/main/kotlin/com/mairwunnx/randomteleport/managers/ConfigurationManager.kt
+++ b/src/main/kotlin/com/mairwunnx/randomteleport/managers/ConfigurationManager.kt
@@ -14,10 +14,17 @@ object ConfigurationManager {
     private var configuration = ConfigurationModel()
     private val logger = LogManager.getLogger()
 
-    @UseExperimental(UnstableDefault::class)
+    @OptIn(UnstableDefault::class)
     private val jsonInstance = Json(
         JsonConfiguration(
-            strictMode = false, allowStructuredMapKeys = true, prettyPrint = true
+            encodeDefaults = true,
+            ignoreUnknownKeys = true,
+            isLenient = false,
+            serializeSpecialFloatingPointValues = false,
+            allowStructuredMapKeys = true,
+            prettyPrint = true,
+            unquotedPrint = false,
+            useArrayPolymorphism = false
         )
     )
 
diff --git a/src/main/kotlin/com/mairwunnx/randomteleport/managers/TeleportRollbackManager.kt b/src/main/kotlin/com/mairwunnx/randomteleport/managers/TeleportRollbackManager.kt
index 5044091..6f39724 100644
--- a/src/main/kotlin/com/mairwunnx/randomteleport/managers/TeleportRollbackManager.kt
+++ b/src/main/kotlin/com/mairwunnx/randomteleport/managers/TeleportRollbackManager.kt
@@ -58,7 +58,7 @@ object TeleportRollbackManager {
      * Removes all expired timers for position
      * rollback.
      */
-    @UseExperimental(ExperimentalTime::class)
+    @OptIn(ExperimentalTime::class)
     private fun purgeAll() {
         logger.debug("Purging all expired location rollback entries")
         lastPosition.rowMap().keys.removeAll {