diff --git a/Bot/Coc.cs b/Bot/Coc.cs
index ff7357b..bd524b7 100644
--- a/Bot/Coc.cs
+++ b/Bot/Coc.cs
@@ -3,9 +3,9 @@
 
 namespace Hyperstellar;
 
-internal class Coc
+internal sealed class Coc
 {
-    private class ClanUtil
+    private sealed class ClanUtil
     {
         internal readonly Clan _clan;
         internal readonly Dictionary<string, ClanMember> _members = [];
@@ -52,7 +52,7 @@ internal readonly struct DonationTuple(int donated, int received)
     }
 
     private const string ClanId = "#2QU2UCJJC";
-    internal static readonly ClashOfClansClient s_client = new(Secrets.Coc);
+    internal static readonly ClashOfClansClient s_client = new(Secrets.s_coc);
 
 #pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
     private static ClanUtil s_prevClan;
diff --git a/Bot/Discord.cs b/Bot/Discord.cs
index 3aee0ec..0532829 100644
--- a/Bot/Discord.cs
+++ b/Bot/Discord.cs
@@ -4,7 +4,7 @@
 
 namespace Hyperstellar;
 
-internal class Discord
+internal sealed class Discord
 {
 #if DEBUG
     private const ulong BotLogId = 666431254312517633;
@@ -34,7 +34,7 @@ internal static async Task InitAsync()
     {
         s_bot.Log += Log;
         s_bot.Ready += Ready;
-        await s_bot.LoginAsync(TokenType.Bot, Secrets.Discord);
+        await s_bot.LoginAsync(TokenType.Bot, Secrets.s_discord);
         await s_bot.StartAsync();
     }
 
diff --git a/Bot/Secrets.cs b/Bot/Secrets.cs
index afb3016..9da53a3 100644
--- a/Bot/Secrets.cs
+++ b/Bot/Secrets.cs
@@ -1,15 +1,15 @@
 using Newtonsoft.Json;
 
-internal class Secrets
+internal sealed class Secrets
 {
-    internal static readonly string Discord;
-    internal static readonly string Coc;
+    internal static readonly string s_discord;
+    internal static readonly string s_coc;
 
     static Secrets()
     {
         string json = File.ReadAllText("secrets.json");
         Dictionary<string, string> dict = JsonConvert.DeserializeObject<Dictionary<string, string>>(json)!;
-        Discord = dict["discord"];
-        Coc = dict["coc"];
+        s_discord = dict["discord"];
+        s_coc = dict["coc"];
     }
 }
\ No newline at end of file
diff --git a/Bot/Sql/Db.cs b/Bot/Sql/Db.cs
index e22dd02..4467e5b 100644
--- a/Bot/Sql/Db.cs
+++ b/Bot/Sql/Db.cs
@@ -2,7 +2,7 @@
 
 namespace Hyperstellar.Sql;
 
-internal class Db
+internal sealed class Db
 {
     private static readonly SQLiteConnection s_db = new("Hyperstellar.db");
 }