diff --git a/app/src/main/java/org/matrix/TEESimulator/config/PatchLevelManager.kt b/app/src/main/java/org/matrix/TEESimulator/config/PatchLevelManager.kt
index 53c2ec2..e94d6c6 100644
--- a/app/src/main/java/org/matrix/TEESimulator/config/PatchLevelManager.kt
+++ b/app/src/main/java/org/matrix/TEESimulator/config/PatchLevelManager.kt
@@ -61,6 +61,7 @@ object PatchLevelManager {
         PifObserver.startWatching()
     }
 
+    @Synchronized
     private fun applyToProps(date: String) {
         if (!DATE_PATTERN.matches(date)) {
             SystemLogger.warning(