diff --git a/LrcParser.Tests/LrcParser.Tests.csproj b/LrcParser.Tests/LrcParser.Tests.csproj
index 3718039..0cf3854 100644
--- a/LrcParser.Tests/LrcParser.Tests.csproj
+++ b/LrcParser.Tests/LrcParser.Tests.csproj
@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>net6.0</TargetFramework>
+        <TargetFramework>net8.0</TargetFramework>
+        <LangVersion>12.0</LangVersion>
         <Nullable>enable</Nullable>
 
         <IsPackable>false</IsPackable>
diff --git a/LrcParser.Tests/Parser/Lrc/LrcParserTest.cs b/LrcParser.Tests/Parser/Lrc/LrcParserTest.cs
index e51c364..27f42cd 100644
--- a/LrcParser.Tests/Parser/Lrc/LrcParserTest.cs
+++ b/LrcParser.Tests/Parser/Lrc/LrcParserTest.cs
@@ -19,9 +19,9 @@ public void TestDecode()
 
         var song = new Song
         {
-            Lyrics = new List<Lyric>
-            {
-                new()
+            Lyrics =
+            [
+                new Lyric
                 {
                     Text = "帰り道は",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -33,7 +33,7 @@ public void TestDecode()
                         { new TextIndex(3, IndexState.End), 19220 },
                     },
                 },
-            },
+            ],
         };
 
         checkDecode(lrcText, song);
@@ -52,9 +52,9 @@ public void TestDecodeWithRuby()
 
         var song = new Song
         {
-            Lyrics = new List<Lyric>
-            {
-                new()
+            Lyrics =
+            [
+                new Lyric
                 {
                     Text = "島島島",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -64,29 +64,29 @@ public void TestDecodeWithRuby()
                         { new TextIndex(2), 3000 },
                         { new TextIndex(2, IndexState.End), 4000 },
                     },
-                    RubyTags = new List<RubyTag>
-                    {
-                        new()
+                    RubyTags =
+                    [
+                        new RubyTag
                         {
                             Text = "しま",
                             StartCharIndex = 0,
                             EndCharIndex = 0,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "じま",
                             StartCharIndex = 1,
                             EndCharIndex = 1,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "とう",
                             StartCharIndex = 2,
                             EndCharIndex = 2,
                         },
-                    },
+                    ],
                 },
-            },
+            ],
         };
 
         checkDecode(lrcText, song);
@@ -105,9 +105,9 @@ public void TestDecodeWithRubyAndRubyTimeTag()
 
         var song = new Song
         {
-            Lyrics = new List<Lyric>
-            {
-                new()
+            Lyrics =
+            [
+                new Lyric
                 {
                     Text = "島島島",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -117,9 +117,9 @@ public void TestDecodeWithRubyAndRubyTimeTag()
                         { new TextIndex(2), 3000 },
                         { new TextIndex(2, IndexState.End), 4000 },
                     },
-                    RubyTags = new List<RubyTag>
-                    {
-                        new()
+                    RubyTags =
+                    [
+                        new RubyTag
                         {
                             Text = "しま",
                             TimeTags = new SortedDictionary<TextIndex, int?>
@@ -129,7 +129,8 @@ public void TestDecodeWithRubyAndRubyTimeTag()
                             StartCharIndex = 0,
                             EndCharIndex = 0,
                         },
-                        new()
+
+                        new RubyTag
                         {
                             Text = "じま",
                             TimeTags = new SortedDictionary<TextIndex, int?>
@@ -139,7 +140,8 @@ public void TestDecodeWithRubyAndRubyTimeTag()
                             StartCharIndex = 1,
                             EndCharIndex = 1,
                         },
-                        new()
+
+                        new RubyTag
                         {
                             Text = "とう",
                             TimeTags = new SortedDictionary<TextIndex, int?>
@@ -149,9 +151,9 @@ public void TestDecodeWithRubyAndRubyTimeTag()
                             StartCharIndex = 2,
                             EndCharIndex = 2,
                         },
-                    },
+                    ],
                 },
-            },
+            ],
         };
 
         checkDecode(lrcText, song);
@@ -170,9 +172,9 @@ public void TestDecodeWithSameRubyWithDifferentRubyTimeTag()
 
         var song = new Song
         {
-            Lyrics = new List<Lyric>
-            {
-                new()
+            Lyrics =
+            [
+                new Lyric
                 {
                     Text = "島島島",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -182,9 +184,9 @@ public void TestDecodeWithSameRubyWithDifferentRubyTimeTag()
                         { new TextIndex(2), 3000 },
                         { new TextIndex(2, IndexState.End), 4000 },
                     },
-                    RubyTags = new List<RubyTag>
-                    {
-                        new()
+                    RubyTags =
+                    [
+                        new RubyTag
                         {
                             Text = "しま",
                             TimeTags = new SortedDictionary<TextIndex, int?>
@@ -194,7 +196,7 @@ public void TestDecodeWithSameRubyWithDifferentRubyTimeTag()
                             StartCharIndex = 0,
                             EndCharIndex = 0,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "しま",
                             TimeTags = new SortedDictionary<TextIndex, int?>
@@ -204,7 +206,7 @@ public void TestDecodeWithSameRubyWithDifferentRubyTimeTag()
                             StartCharIndex = 1,
                             EndCharIndex = 1,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "しま",
                             TimeTags = new SortedDictionary<TextIndex, int?>
@@ -214,9 +216,9 @@ public void TestDecodeWithSameRubyWithDifferentRubyTimeTag()
                             StartCharIndex = 2,
                             EndCharIndex = 2,
                         },
-                    },
+                    ],
                 },
-            },
+            ],
         };
 
         checkDecode(lrcText, song);
@@ -236,40 +238,40 @@ public void TestDecodeWithNoTimeRangeRuby()
 
         var song = new Song
         {
-            Lyrics = new List<Lyric>
-            {
-                new()
+            Lyrics =
+            [
+                new Lyric
                 {
                     Text = "カラオケ",
-                    RubyTags = new List<RubyTag>
-                    {
-                        new()
+                    RubyTags =
+                    [
+                        new RubyTag
                         {
                             Text = "か",
                             StartCharIndex = 0,
                             EndCharIndex = 0,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "ら",
                             StartCharIndex = 1,
                             EndCharIndex = 1,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "お",
                             StartCharIndex = 2,
                             EndCharIndex = 2,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "け",
                             StartCharIndex = 3,
                             EndCharIndex = 3,
                         },
-                    },
+                    ],
                 },
-            },
+            ],
         };
 
         checkDecode(lrcText, song);
@@ -290,9 +292,9 @@ public void TestDecodeWithRubyInDifferentLine()
 
         var song = new Song
         {
-            Lyrics = new List<Lyric>
-            {
-                new()
+            Lyrics =
+            [
+                new Lyric
                 {
                     Text = "島",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -300,17 +302,18 @@ public void TestDecodeWithRubyInDifferentLine()
                         { new TextIndex(0), 1000 },
                         { new TextIndex(0, IndexState.End), 2000 },
                     },
-                    RubyTags = new List<RubyTag>
-                    {
-                        new()
+                    RubyTags =
+                    [
+                        new RubyTag
                         {
                             Text = "しま",
                             StartCharIndex = 0,
                             EndCharIndex = 0,
                         },
-                    },
+                    ],
                 },
-                new()
+
+                new Lyric
                 {
                     Text = "島",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -318,17 +321,18 @@ public void TestDecodeWithRubyInDifferentLine()
                         { new TextIndex(0), 3000 },
                         { new TextIndex(0, IndexState.End), 4000 },
                     },
-                    RubyTags = new List<RubyTag>
-                    {
-                        new()
+                    RubyTags =
+                    [
+                        new RubyTag
                         {
                             Text = "じま",
                             StartCharIndex = 0,
                             EndCharIndex = 0,
                         },
-                    },
+                    ],
                 },
-                new()
+
+                new Lyric
                 {
                     Text = "島",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -336,17 +340,17 @@ public void TestDecodeWithRubyInDifferentLine()
                         { new TextIndex(0), 5000 },
                         { new TextIndex(0, IndexState.End), 6000 },
                     },
-                    RubyTags = new List<RubyTag>
-                    {
-                        new()
+                    RubyTags =
+                    [
+                        new RubyTag
                         {
                             Text = "とう",
                             StartCharIndex = 0,
                             EndCharIndex = 0,
                         },
-                    },
+                    ],
                 },
-            },
+            ],
         };
 
         checkDecode(lrcText, song);
@@ -364,9 +368,9 @@ public void TestDecodeWithInvalid()
 
         var song = new Song
         {
-            Lyrics = new List<Lyric>
-            {
-                new()
+            Lyrics =
+            [
+                new Lyric
                 {
                     Text = "島",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -375,7 +379,7 @@ public void TestDecodeWithInvalid()
                         { new TextIndex(0, IndexState.End), 2000 },
                     },
                 },
-            },
+            ],
         };
 
         checkDecode(lrcText, song);
@@ -386,9 +390,9 @@ public void TestEncode()
     {
         var song = new Song
         {
-            Lyrics = new List<Lyric>
-            {
-                new()
+            Lyrics =
+            [
+                new Lyric
                 {
                     Text = "帰り道は",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -400,7 +404,7 @@ public void TestEncode()
                         { new TextIndex(3, IndexState.End), 19220 },
                     },
                 },
-            },
+            ],
         };
 
         var lrcText = new[]
@@ -416,9 +420,9 @@ public void TestEncodeWithRuby()
     {
         var song = new Song
         {
-            Lyrics = new List<Lyric>
-            {
-                new()
+            Lyrics =
+            [
+                new Lyric
                 {
                     Text = "島島島",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -428,29 +432,29 @@ public void TestEncodeWithRuby()
                         { new TextIndex(2), 3000 },
                         { new TextIndex(2, IndexState.End), 4000 },
                     },
-                    RubyTags = new List<RubyTag>
-                    {
-                        new()
+                    RubyTags =
+                    [
+                        new RubyTag
                         {
                             Text = "しま",
                             StartCharIndex = 0,
                             EndCharIndex = 0,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "じま",
                             StartCharIndex = 1,
                             EndCharIndex = 1,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "とう",
                             StartCharIndex = 2,
                             EndCharIndex = 2,
                         },
-                    },
+                    ],
                 },
-            },
+            ],
         };
 
         var lrcText = new[]
@@ -470,9 +474,9 @@ public void TestEncodeWithRubyAndRubyTimeTag()
     {
         var song = new Song
         {
-            Lyrics = new List<Lyric>
-            {
-                new()
+            Lyrics =
+            [
+                new Lyric
                 {
                     Text = "島島島",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -482,9 +486,9 @@ public void TestEncodeWithRubyAndRubyTimeTag()
                         { new TextIndex(2), 3000 },
                         { new TextIndex(2, IndexState.End), 4000 },
                     },
-                    RubyTags = new List<RubyTag>
-                    {
-                        new()
+                    RubyTags =
+                    [
+                        new RubyTag
                         {
                             Text = "しま",
                             TimeTags = new SortedDictionary<TextIndex, int?>
@@ -494,7 +498,7 @@ public void TestEncodeWithRubyAndRubyTimeTag()
                             StartCharIndex = 0,
                             EndCharIndex = 0,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "じま",
                             TimeTags = new SortedDictionary<TextIndex, int?>
@@ -504,7 +508,7 @@ public void TestEncodeWithRubyAndRubyTimeTag()
                             StartCharIndex = 1,
                             EndCharIndex = 1,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "とう",
                             TimeTags = new SortedDictionary<TextIndex, int?>
@@ -514,9 +518,9 @@ public void TestEncodeWithRubyAndRubyTimeTag()
                             StartCharIndex = 2,
                             EndCharIndex = 2,
                         },
-                    },
+                    ],
                 },
-            },
+            ],
         };
 
         var lrcText = new[]
@@ -536,9 +540,9 @@ public void TestEncodeWithSameRubyWithDifferentRubyTimeTag()
     {
         var song = new Song
         {
-            Lyrics = new List<Lyric>
-            {
-                new()
+            Lyrics =
+            [
+                new Lyric
                 {
                     Text = "島島島島",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -549,9 +553,9 @@ public void TestEncodeWithSameRubyWithDifferentRubyTimeTag()
                         { new TextIndex(3), 4000 },
                         { new TextIndex(3, IndexState.End), 5000 },
                     },
-                    RubyTags = new List<RubyTag>
-                    {
-                        new()
+                    RubyTags =
+                    [
+                        new RubyTag
                         {
                             Text = "しま",
                             TimeTags = new SortedDictionary<TextIndex, int?>
@@ -561,7 +565,7 @@ public void TestEncodeWithSameRubyWithDifferentRubyTimeTag()
                             StartCharIndex = 0,
                             EndCharIndex = 0,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "しま",
                             TimeTags = new SortedDictionary<TextIndex, int?>
@@ -571,7 +575,7 @@ public void TestEncodeWithSameRubyWithDifferentRubyTimeTag()
                             StartCharIndex = 1,
                             EndCharIndex = 1,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "しま",
                             TimeTags = new SortedDictionary<TextIndex, int?>
@@ -582,7 +586,7 @@ public void TestEncodeWithSameRubyWithDifferentRubyTimeTag()
                             StartCharIndex = 2,
                             EndCharIndex = 2,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "しま",
                             TimeTags = new SortedDictionary<TextIndex, int?>
@@ -593,9 +597,9 @@ public void TestEncodeWithSameRubyWithDifferentRubyTimeTag()
                             StartCharIndex = 3,
                             EndCharIndex = 3,
                         },
-                    },
+                    ],
                 },
-            },
+            ],
         };
 
         var lrcText = new[]
@@ -615,40 +619,40 @@ public void TestEncodeWithNoTimeRangeRuby()
     {
         var song = new Song
         {
-            Lyrics = new List<Lyric>
-            {
-                new()
+            Lyrics =
+            [
+                new Lyric
                 {
                     Text = "カラオケ",
-                    RubyTags = new List<RubyTag>
-                    {
-                        new()
+                    RubyTags =
+                    [
+                        new RubyTag
                         {
                             Text = "か",
                             StartCharIndex = 0,
                             EndCharIndex = 0,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "ら",
                             StartCharIndex = 1,
                             EndCharIndex = 1,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "お",
                             StartCharIndex = 2,
                             EndCharIndex = 2,
                         },
-                        new()
+                        new RubyTag
                         {
                             Text = "け",
                             StartCharIndex = 3,
                             EndCharIndex = 3,
                         },
-                    },
+                    ],
                 },
-            },
+            ],
         };
 
         var lrcText = new[]
@@ -669,9 +673,9 @@ public void TestEncodeWithRubyInDifferentLine()
     {
         var song = new Song
         {
-            Lyrics = new List<Lyric>
-            {
-                new()
+            Lyrics =
+            [
+                new Lyric
                 {
                     Text = "島",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -679,17 +683,18 @@ public void TestEncodeWithRubyInDifferentLine()
                         { new TextIndex(0), 1000 },
                         { new TextIndex(0, IndexState.End), 2000 },
                     },
-                    RubyTags = new List<RubyTag>
-                    {
-                        new()
+                    RubyTags =
+                    [
+                        new RubyTag
                         {
                             Text = "しま",
                             StartCharIndex = 0,
                             EndCharIndex = 0,
                         },
-                    },
+                    ],
                 },
-                new()
+
+                new Lyric
                 {
                     Text = "島",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -697,17 +702,18 @@ public void TestEncodeWithRubyInDifferentLine()
                         { new TextIndex(0), 3000 },
                         { new TextIndex(0, IndexState.End), 4000 },
                     },
-                    RubyTags = new List<RubyTag>
-                    {
-                        new()
+                    RubyTags =
+                    [
+                        new RubyTag
                         {
                             Text = "じま",
                             StartCharIndex = 0,
                             EndCharIndex = 0,
                         },
-                    },
+                    ],
                 },
-                new()
+
+                new Lyric
                 {
                     Text = "島",
                     TimeTags = new SortedDictionary<TextIndex, int?>
@@ -715,17 +721,17 @@ public void TestEncodeWithRubyInDifferentLine()
                         { new TextIndex(0), 5000 },
                         { new TextIndex(0, IndexState.End), 6000 },
                     },
-                    RubyTags = new List<RubyTag>
-                    {
-                        new()
+                    RubyTags =
+                    [
+                        new RubyTag
                         {
                             Text = "とう",
                             StartCharIndex = 0,
                             EndCharIndex = 0,
                         },
-                    },
+                    ],
                 },
-            },
+            ],
         };
 
         var lrcText = new[]
diff --git a/LrcParser.Tests/Utils/TypeUtilsTest.cs b/LrcParser.Tests/Utils/TypeUtilsTest.cs
index 59eeae9..263c57b 100644
--- a/LrcParser.Tests/Utils/TypeUtilsTest.cs
+++ b/LrcParser.Tests/Utils/TypeUtilsTest.cs
@@ -40,7 +40,5 @@ public void TestChangeTypeToDifferentType()
         Assert.That(TypeUtils.ChangeType<double?>(null), Is.EqualTo(default(double?)));
     }
 
-    private class TestClass
-    {
-    }
+    private class TestClass;
 }
diff --git a/LrcParser/LrcParser.csproj b/LrcParser/LrcParser.csproj
index 8ca38bd..59537df 100644
--- a/LrcParser/LrcParser.csproj
+++ b/LrcParser/LrcParser.csproj
@@ -2,7 +2,7 @@
 
     <PropertyGroup>
         <TargetFramework>netstandard2.1</TargetFramework>
-        <LangVersion>10.0</LangVersion>
+        <LangVersion>12.0</LangVersion>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
     </PropertyGroup>
diff --git a/LrcParser/Model/Lyric.cs b/LrcParser/Model/Lyric.cs
index a13c69b..e4259f1 100644
--- a/LrcParser/Model/Lyric.cs
+++ b/LrcParser/Model/Lyric.cs
@@ -18,5 +18,5 @@ public class Lyric
     /// <summary>
     /// Ruby tags
     /// </summary>
-    public List<RubyTag> RubyTags { get; set; } = new();
+    public List<RubyTag> RubyTags { get; set; } = [];
 }
diff --git a/LrcParser/Model/Song.cs b/LrcParser/Model/Song.cs
index 1a5838d..68e1836 100644
--- a/LrcParser/Model/Song.cs
+++ b/LrcParser/Model/Song.cs
@@ -5,5 +5,5 @@ namespace LrcParser.Model;
 
 public class Song
 {
-    public List<Lyric> Lyrics { get; set; } = new();
+    public List<Lyric> Lyrics { get; set; } = [];
 }
diff --git a/LrcParser/Parser/Lines/SingleLineParser.cs b/LrcParser/Parser/Lines/SingleLineParser.cs
index 644be41..82fd333 100644
--- a/LrcParser/Parser/Lines/SingleLineParser.cs
+++ b/LrcParser/Parser/Lines/SingleLineParser.cs
@@ -16,7 +16,13 @@ public bool CanEncode(object component)
 
     object ISingleLineParser.Decode(string text) => Decode(text);
 
-    public string Encode(object component, int index) => Encode(component as T, index);
+    public string Encode(object component, int index)
+    {
+        if (component is not T target)
+            throw new InvalidCastException();
+
+        return Encode(target, index);
+    }
 
     /// <summary>
     /// Decode to target class and leave remain text
diff --git a/LrcParser/Parser/Lrc/Lines/LrcRubyParser.cs b/LrcParser/Parser/Lrc/Lines/LrcRubyParser.cs
index 53ef629..11a0616 100644
--- a/LrcParser/Parser/Lrc/Lines/LrcRubyParser.cs
+++ b/LrcParser/Parser/Lrc/Lines/LrcRubyParser.cs
@@ -12,7 +12,7 @@ namespace LrcParser.Parser.Lrc.Lines;
 public class LrcRubyParser : SingleLineParser<LrcRuby>
 {
     public override bool CanDecode(string text)
-        => !string.IsNullOrEmpty(text) && text.ToLower().StartsWith("@ruby");
+        => !string.IsNullOrEmpty(text) && text.ToLower().StartsWith("@ruby", StringComparison.Ordinal);
 
     public override LrcRuby Decode(string text)
     {
diff --git a/LrcParser/Parser/LyricParser.cs b/LrcParser/Parser/LyricParser.cs
index 84f8aab..72c1b1d 100644
--- a/LrcParser/Parser/LyricParser.cs
+++ b/LrcParser/Parser/LyricParser.cs
@@ -29,7 +29,7 @@ public Song Decode(string text)
             return new Song();
 
         var lines = text.Split(
-            new[] { "\r\n", "\r", "\n" },
+            ["\r\n", "\r", "\n"],
             StringSplitOptions.None
         ).Where(x => !string.IsNullOrWhiteSpace(x));