diff --git a/Domain/Config/RankConfig.cs b/Domain/Config/RankConfig.cs
index b72623d..06ad211 100644
--- a/Domain/Config/RankConfig.cs
+++ b/Domain/Config/RankConfig.cs
@@ -1,8 +1,11 @@
-namespace Domain.Config;
+using System.ComponentModel.DataAnnotations;
+
+namespace Domain.Config;
 
 public class RankConfig
 {
     public const string RANK_SECTION = "Rank";
     
+    [Required, Range(1, double.MaxValue, ErrorMessage = "Value for {0} must be greater than 0!")]
     public int RefreshIntervalHours { get; set; } = 24;
 }
\ No newline at end of file
diff --git a/MainServer/Program.cs b/MainServer/Program.cs
index 9dbb298..df33e65 100644
--- a/MainServer/Program.cs
+++ b/MainServer/Program.cs
@@ -52,8 +52,10 @@ try
         builder.Configuration.GetSection(GameConfig.GAME_SECTION));
     builder.Services.Configure<AuthConfig>(
         builder.Configuration.GetSection(AuthConfig.AUTH_SECTION));
-    builder.Services.Configure<RankConfig>(
-        builder.Configuration.GetSection(RankConfig.RANK_SECTION));
+    builder.Services.AddOptions<RankConfig>()
+        .Bind(builder.Configuration.GetSection(RankConfig.RANK_SECTION))
+        .ValidateDataAnnotations()
+        .ValidateOnStart();
 
     var serverIp = builder.Configuration["ServerIp"] ?? "127.0.0.1";
     var certificateManager = new CertificateService(serverIp, new SerilogLoggerFactory(Log.Logger).CreateLogger(""));
@@ -82,6 +84,8 @@ try
 
     var refreshIntervalHours = builder.Configuration.GetSection(RankConfig.RANK_SECTION).
         GetValue<int>("RefreshIntervalHours");
+    refreshIntervalHours.Throw().IfLessThanOrEqualTo(0);
+    Log.Information("Rank refresh interval: {RefreshIntervalHours} hours", refreshIntervalHours);
     builder.Services.AddApplication(refreshIntervalHours);
     builder.Services.AddInfrastructure(builder.Configuration);