diff --git a/src/ShukujitsuSharp.Generator/ShukujitsuSharp.Generator.csproj b/src/ShukujitsuSharp.Generator/ShukujitsuSharp.Generator.csproj
index b6619ef..b63d812 100644
--- a/src/ShukujitsuSharp.Generator/ShukujitsuSharp.Generator.csproj
+++ b/src/ShukujitsuSharp.Generator/ShukujitsuSharp.Generator.csproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Text.Encoding.CodePages" Version="7.0.0" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="8.0.0" />
   </ItemGroup>
 
   <ItemGroup>