diff --git a/MimeKit/MimeKit.csproj b/MimeKit/MimeKit.csproj
index 96dd196117..c99200c887 100644
--- a/MimeKit/MimeKit.csproj
+++ b/MimeKit/MimeKit.csproj
@@ -48,13 +48,13 @@
   <ItemGroup Condition=" $(TargetFramework.StartsWith('netstandard1.')) ">
     <PackageReference Include="System.Reflection.TypeExtensions" Version="4.4.0" />
     <PackageReference Include="System.Globalization.Extensions" Version="4.3.0" />
-    <PackageReference Include="System.Text.Encoding.CodePages" Version="4.4.0" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="6.0.0" />
     <PackageReference Include="System.Data.Common" Version="4.3.0" />
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('netstandard2.')) ">
     <PackageReference Include="System.Reflection.TypeExtensions" Version="4.4.0" />
-    <PackageReference Include="System.Text.Encoding.CodePages" Version="4.4.0" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="6.0.0" />
     <PackageReference Include="System.Security.Cryptography.Pkcs" Version="4.7.0" />
   </ItemGroup>
 
@@ -71,7 +71,7 @@
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net5')) ">
     <PackageReference Include="System.Reflection.TypeExtensions" Version="4.4.0" />
-    <PackageReference Include="System.Text.Encoding.CodePages" Version="4.4.0" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="6.0.0" />
     <PackageReference Include="System.Security.Cryptography.Pkcs" Version="4.7.0" />
   </ItemGroup>
   
diff --git a/MimeKit/MimeKitLite.csproj b/MimeKit/MimeKitLite.csproj
index a720c1a309..f8a2e3ea8c 100644
--- a/MimeKit/MimeKitLite.csproj
+++ b/MimeKit/MimeKitLite.csproj
@@ -46,12 +46,12 @@
    
   <ItemGroup Condition=" $(TargetFramework.StartsWith('netstandard2.0')) ">
     <PackageReference Include="System.Reflection.TypeExtensions" Version="4.4.0" />
-    <PackageReference Include="System.Text.Encoding.CodePages" Version="4.4.0" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="6.0.0" />
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net5')) ">
     <PackageReference Include="System.Reflection.TypeExtensions" Version="4.4.0" />
-    <PackageReference Include="System.Text.Encoding.CodePages" Version="4.4.0" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="6.0.0" />
   </ItemGroup>
 
   <ItemGroup>