diff --git a/osu.Game.Tournament/Screens/Drawings/DrawingsScreen.cs b/osu.Game.Tournament/Screens/Drawings/DrawingsScreen.cs
index e10154b722..4c3adeae76 100644
--- a/osu.Game.Tournament/Screens/Drawings/DrawingsScreen.cs
+++ b/osu.Game.Tournament/Screens/Drawings/DrawingsScreen.cs
@@ -234,7 +234,7 @@ namespace osu.Game.Tournament.Screens.Drawings
                             if (string.IsNullOrEmpty(line))
                                 continue;
 
-                            if (line.ToUpperInvariant().StartsWith("GROUP"))
+                            if (line.ToUpperInvariant().StartsWith("GROUP", StringComparison.Ordinal))
                                 continue;
 
                             // ReSharper disable once AccessToModifiedClosure
diff --git a/osu.Game/Beatmaps/Formats/LegacyDecoder.cs b/osu.Game/Beatmaps/Formats/LegacyDecoder.cs
index c15240a4f6..7b377e481f 100644
--- a/osu.Game/Beatmaps/Formats/LegacyDecoder.cs
+++ b/osu.Game/Beatmaps/Formats/LegacyDecoder.cs
@@ -92,7 +92,7 @@ namespace osu.Game.Beatmaps.Formats
         {
             var pair = SplitKeyVal(line);
 
-            bool isCombo = pair.Key.StartsWith(@"Combo");
+            bool isCombo = pair.Key.StartsWith(@"Combo", StringComparison.Ordinal);
 
             string[] split = pair.Value.Split(',');
 
diff --git a/osu.Game/OsuGame.cs b/osu.Game/OsuGame.cs
index d315b213ab..56cced9c04 100644
--- a/osu.Game/OsuGame.cs
+++ b/osu.Game/OsuGame.cs
@@ -181,7 +181,7 @@ namespace osu.Game
 
             if (args?.Length > 0)
             {
-                var paths = args.Where(a => !a.StartsWith(@"-")).ToArray();
+                var paths = args.Where(a => !a.StartsWith(@"-", StringComparison.Ordinal)).ToArray();
                 if (paths.Length > 0)
                     Task.Run(() => Import(paths));
             }
@@ -289,7 +289,7 @@ namespace osu.Game
 
         public void OpenUrlExternally(string url) => waitForReady(() => externalLinkOpener, _ =>
         {
-            if (url.StartsWith("/"))
+            if (url.StartsWith("/", StringComparison.Ordinal))
                 url = $"{API.Endpoint}{url}";
 
             externalLinkOpener.OpenUrlExternally(url);
diff --git a/osu.Game/Rulesets/RulesetStore.cs b/osu.Game/Rulesets/RulesetStore.cs
index 5d93f5186b..c12d418771 100644
--- a/osu.Game/Rulesets/RulesetStore.cs
+++ b/osu.Game/Rulesets/RulesetStore.cs
@@ -100,7 +100,7 @@ namespace osu.Game.Rulesets
                 {
                     // todo: StartsWith can be changed to Equals on 2020-11-08
                     // This is to give users enough time to have their database use new abbreviated info).
-                    if (context.RulesetInfo.FirstOrDefault(ri => ri.InstantiationInfo.StartsWith(r.RulesetInfo.InstantiationInfo)) == null)
+                    if (context.RulesetInfo.FirstOrDefault(ri => ri.InstantiationInfo.StartsWith(r.RulesetInfo.InstantiationInfo, StringComparison.Ordinal)) == null)
                         context.RulesetInfo.Add(r.RulesetInfo);
                 }
 
diff --git a/osu.Game/Skinning/LegacyManiaSkinDecoder.cs b/osu.Game/Skinning/LegacyManiaSkinDecoder.cs
index a9d88e77ad..3dbec23194 100644
--- a/osu.Game/Skinning/LegacyManiaSkinDecoder.cs
+++ b/osu.Game/Skinning/LegacyManiaSkinDecoder.cs
@@ -1,6 +1,7 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Globalization;
@@ -115,16 +116,16 @@ namespace osu.Game.Skinning
                             currentConfig.MinimumColumnWidth = minWidth;
                         break;
 
-                    case string _ when pair.Key.StartsWith("Colour"):
+                    case string _ when pair.Key.StartsWith("Colour", StringComparison.Ordinal):
                         HandleColours(currentConfig, line);
                         break;
 
                     // Custom sprite paths
-                    case string _ when pair.Key.StartsWith("NoteImage"):
-                    case string _ when pair.Key.StartsWith("KeyImage"):
-                    case string _ when pair.Key.StartsWith("Hit"):
-                    case string _ when pair.Key.StartsWith("Stage"):
-                    case string _ when pair.Key.StartsWith("Lighting"):
+                    case string _ when pair.Key.StartsWith("NoteImage", StringComparison.Ordinal):
+                    case string _ when pair.Key.StartsWith("KeyImage", StringComparison.Ordinal):
+                    case string _ when pair.Key.StartsWith("Hit", StringComparison.Ordinal):
+                    case string _ when pair.Key.StartsWith("Stage", StringComparison.Ordinal):
+                    case string _ when pair.Key.StartsWith("Lighting", StringComparison.Ordinal):
                         currentConfig.ImageLookups[pair.Key] = pair.Value;
                         break;
                 }
diff --git a/osu.Game/Utils/SentryLogger.cs b/osu.Game/Utils/SentryLogger.cs
index 981251784e..e8e41cdbbe 100644
--- a/osu.Game/Utils/SentryLogger.cs
+++ b/osu.Game/Utils/SentryLogger.cs
@@ -45,7 +45,7 @@ namespace osu.Game.Utils
 
                     // since we let unhandled exceptions go ignored at times, we want to ensure they don't get submitted on subsequent reports.
                     if (lastException != null &&
-                        lastException.Message == exception.Message && exception.StackTrace.StartsWith(lastException.StackTrace))
+                        lastException.Message == exception.Message && exception.StackTrace.StartsWith(lastException.StackTrace, StringComparison.Ordinal))
                         return;
 
                     lastException = exception;