diff --git a/MimeKit/MimeKit.csproj b/MimeKit/MimeKit.csproj
index 1699b5bc57..f3e77a4d6d 100644
--- a/MimeKit/MimeKit.csproj
+++ b/MimeKit/MimeKit.csproj
@@ -74,7 +74,7 @@
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('netstandard2.')) ">
-    <PackageReference Include="System.Text.Encoding.CodePages" Version="9.0.9" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="9.0.17" />
   </ItemGroup>
 
   <ItemGroup Condition=" ! $(TargetFramework.StartsWith('net4')) ">
diff --git a/MimeKit/MimeKitLite.csproj b/MimeKit/MimeKitLite.csproj
index 6859cc0456..20b982a41c 100644
--- a/MimeKit/MimeKitLite.csproj
+++ b/MimeKit/MimeKitLite.csproj
@@ -63,7 +63,7 @@
   </PropertyGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('netstandard2.')) ">
-    <PackageReference Include="System.Text.Encoding.CodePages" Version="9.0.9" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="9.0.17" />
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net4')) Or '$(TargetFramework)' == 'netstandard2.0' ">