diff --git a/CodeAnalysis/osu.ruleset b/CodeAnalysis/osu.ruleset
index 0756adb05c..1aa8f66c93 100644
--- a/CodeAnalysis/osu.ruleset
+++ b/CodeAnalysis/osu.ruleset
@@ -54,6 +54,7 @@
     <Rule Id="CA2235" Action="None" />
   </Rules>
   <Rules AnalyzerId="Microsoft.NetCore.CSharp.Analyzers" RuleNamespace="Microsoft.NetCore.CSharp.Analyzers">
+    <Rule Id="CA1309" Action="Warning" />
     <Rule Id="CA2201" Action="Warning" />
   </Rules>
 </RuleSet>
\ No newline at end of file
diff --git a/osu.Game/Beatmaps/BeatmapManager_WorkingBeatmap.cs b/osu.Game/Beatmaps/BeatmapManager_WorkingBeatmap.cs
index 4924842e81..f9d71a2a6e 100644
--- a/osu.Game/Beatmaps/BeatmapManager_WorkingBeatmap.cs
+++ b/osu.Game/Beatmaps/BeatmapManager_WorkingBeatmap.cs
@@ -42,7 +42,7 @@ namespace osu.Game.Beatmaps
                 }
             }
 
-            private string getPathForFile(string filename) => BeatmapSetInfo.Files.FirstOrDefault(f => string.Equals(f.Filename, filename, StringComparison.InvariantCultureIgnoreCase))?.FileInfo.StoragePath;
+            private string getPathForFile(string filename) => BeatmapSetInfo.Files.FirstOrDefault(f => string.Equals(f.Filename, filename, StringComparison.OrdinalIgnoreCase))?.FileInfo.StoragePath;
 
             private TextureStore textureStore;
 
diff --git a/osu.Game/Beatmaps/ControlPoints/SampleControlPoint.cs b/osu.Game/Beatmaps/ControlPoints/SampleControlPoint.cs
index 42865c686c..393bcfdb3c 100644
--- a/osu.Game/Beatmaps/ControlPoints/SampleControlPoint.cs
+++ b/osu.Game/Beatmaps/ControlPoints/SampleControlPoint.cs
@@ -70,6 +70,6 @@ namespace osu.Game.Beatmaps.ControlPoints
 
         public override bool EquivalentTo(ControlPoint other) =>
             other is SampleControlPoint otherTyped &&
-            string.Equals(SampleBank, otherTyped.SampleBank) && SampleVolume == otherTyped.SampleVolume;
+            SampleBank == otherTyped.SampleBank && SampleVolume == otherTyped.SampleVolume;
     }
 }
diff --git a/osu.Game/Scoring/ScoreManager.cs b/osu.Game/Scoring/ScoreManager.cs
index 3279af05b6..332b3e3f05 100644
--- a/osu.Game/Scoring/ScoreManager.cs
+++ b/osu.Game/Scoring/ScoreManager.cs
@@ -57,7 +57,7 @@ namespace osu.Game.Scoring
         }
 
         protected override IEnumerable<string> GetStableImportPaths(Storage stableStorage)
-            => stableStorage.GetFiles(ImportFromStablePath).Where(p => HandledExtensions.Any(ext => Path.GetExtension(p)?.Equals(ext, StringComparison.InvariantCultureIgnoreCase) ?? false));
+            => stableStorage.GetFiles(ImportFromStablePath).Where(p => HandledExtensions.Any(ext => Path.GetExtension(p)?.Equals(ext, StringComparison.OrdinalIgnoreCase) ?? false));
 
         public Score GetScore(ScoreInfo score) => new LegacyDatabasedScore(score, rulesets, beatmaps(), Files.Store);
 
diff --git a/osu.Game/Screens/Select/Carousel/CarouselBeatmapSet.cs b/osu.Game/Screens/Select/Carousel/CarouselBeatmapSet.cs
index 35816fe620..301d0d4dae 100644
--- a/osu.Game/Screens/Select/Carousel/CarouselBeatmapSet.cs
+++ b/osu.Game/Screens/Select/Carousel/CarouselBeatmapSet.cs
@@ -37,13 +37,13 @@ namespace osu.Game.Screens.Select.Carousel
             {
                 default:
                 case SortMode.Artist:
-                    return string.Compare(BeatmapSet.Metadata.Artist, otherSet.BeatmapSet.Metadata.Artist, StringComparison.InvariantCultureIgnoreCase);
+                    return string.Compare(BeatmapSet.Metadata.Artist, otherSet.BeatmapSet.Metadata.Artist, StringComparison.OrdinalIgnoreCase);
 
                 case SortMode.Title:
-                    return string.Compare(BeatmapSet.Metadata.Title, otherSet.BeatmapSet.Metadata.Title, StringComparison.InvariantCultureIgnoreCase);
+                    return string.Compare(BeatmapSet.Metadata.Title, otherSet.BeatmapSet.Metadata.Title, StringComparison.OrdinalIgnoreCase);
 
                 case SortMode.Author:
-                    return string.Compare(BeatmapSet.Metadata.Author.Username, otherSet.BeatmapSet.Metadata.Author.Username, StringComparison.InvariantCultureIgnoreCase);
+                    return string.Compare(BeatmapSet.Metadata.Author.Username, otherSet.BeatmapSet.Metadata.Author.Username, StringComparison.OrdinalIgnoreCase);
 
                 case SortMode.DateAdded:
                     return otherSet.BeatmapSet.DateAdded.CompareTo(BeatmapSet.DateAdded);
diff --git a/osu.Game/Screens/Select/FilterCriteria.cs b/osu.Game/Screens/Select/FilterCriteria.cs
index e3ad76ac35..c4d9996377 100644
--- a/osu.Game/Screens/Select/FilterCriteria.cs
+++ b/osu.Game/Screens/Select/FilterCriteria.cs
@@ -105,7 +105,7 @@ namespace osu.Game.Screens.Select
 
             public string SearchTerm;
 
-            public bool Equals(OptionalTextFilter other) => SearchTerm?.Equals(other.SearchTerm) ?? true;
+            public bool Equals(OptionalTextFilter other) => SearchTerm == other.SearchTerm;
         }
     }
 }
diff --git a/osu.Game/Skinning/LegacySkinResourceStore.cs b/osu.Game/Skinning/LegacySkinResourceStore.cs
index 79a4e2e932..249d48b34b 100644
--- a/osu.Game/Skinning/LegacySkinResourceStore.cs
+++ b/osu.Game/Skinning/LegacySkinResourceStore.cs
@@ -34,7 +34,7 @@ namespace osu.Game.Skinning
         }
 
         private string getPathForFile(string filename) =>
-            source.Files.Find(f => string.Equals(f.Filename, filename, StringComparison.InvariantCultureIgnoreCase))?.FileInfo.StoragePath;
+            source.Files.Find(f => string.Equals(f.Filename, filename, StringComparison.OrdinalIgnoreCase))?.FileInfo.StoragePath;
 
         public override IEnumerable<string> GetAvailableResources() => source.Files.Select(f => f.Filename);
     }
diff --git a/osu.Game/Storyboards/Drawables/DrawableStoryboardAnimation.cs b/osu.Game/Storyboards/Drawables/DrawableStoryboardAnimation.cs
index de3077c025..4f8e39fa1b 100644
--- a/osu.Game/Storyboards/Drawables/DrawableStoryboardAnimation.cs
+++ b/osu.Game/Storyboards/Drawables/DrawableStoryboardAnimation.cs
@@ -71,7 +71,7 @@ namespace osu.Game.Storyboards.Drawables
             {
                 var framePath = Animation.Path.Replace(".", frame + ".");
 
-                var path = beatmap.Value.BeatmapSetInfo.Files.Find(f => f.Filename.Equals(framePath, StringComparison.InvariantCultureIgnoreCase))?.FileInfo.StoragePath;
+                var path = beatmap.Value.BeatmapSetInfo.Files.Find(f => f.Filename.Equals(framePath, StringComparison.OrdinalIgnoreCase))?.FileInfo.StoragePath;
                 if (path == null)
                     continue;
 
diff --git a/osu.Game/Storyboards/Drawables/DrawableStoryboardSprite.cs b/osu.Game/Storyboards/Drawables/DrawableStoryboardSprite.cs
index 3a117d1713..ff48dab7e5 100644
--- a/osu.Game/Storyboards/Drawables/DrawableStoryboardSprite.cs
+++ b/osu.Game/Storyboards/Drawables/DrawableStoryboardSprite.cs
@@ -66,7 +66,7 @@ namespace osu.Game.Storyboards.Drawables
         [BackgroundDependencyLoader]
         private void load(IBindable<WorkingBeatmap> beatmap, TextureStore textureStore)
         {
-            var path = beatmap.Value.BeatmapSetInfo?.Files?.Find(f => f.Filename.Equals(Sprite.Path, StringComparison.InvariantCultureIgnoreCase))?.FileInfo.StoragePath;
+            var path = beatmap.Value.BeatmapSetInfo?.Files?.Find(f => f.Filename.Equals(Sprite.Path, StringComparison.OrdinalIgnoreCase))?.FileInfo.StoragePath;
             if (path == null)
                 return;