diff --git a/src/core/IronPython.Modules/IronPython.Modules.csproj b/src/core/IronPython.Modules/IronPython.Modules.csproj
index 86e575a48..b27bcb7f6 100644
--- a/src/core/IronPython.Modules/IronPython.Modules.csproj
+++ b/src/core/IronPython.Modules/IronPython.Modules.csproj
@@ -15,6 +15,7 @@
       T:System.Runtime.Versioning.SupportedOSPlatformAttribute;
       M:System.String.Contains(System.Char);
       M:System.String.EndsWith(System.Char);
+      M:System.Text.Encoding.GetString(System.ReadOnlySpan{System.Byte});
     </MeziantouPolyfill_IncludedPolyfills>
   </PropertyGroup>
 
@@ -44,7 +45,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Meziantou.Polyfill" Version="1.0.127">
+    <PackageReference Include="Meziantou.Polyfill" Version="1.0.140">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
diff --git a/src/core/IronPython/IronPython.csproj b/src/core/IronPython/IronPython.csproj
index 9360331b0..8a511ee02 100644
--- a/src/core/IronPython/IronPython.csproj
+++ b/src/core/IronPython/IronPython.csproj
@@ -19,6 +19,7 @@
       M:System.String.Contains(System.Char);
       M:System.String.EndsWith(System.Char);
       M:System.String.StartsWith(System.Char);
+      M:System.Text.Encoding.GetString(System.ReadOnlySpan{System.Byte});
     </MeziantouPolyfill_IncludedPolyfills>
   </PropertyGroup>
 
@@ -65,7 +66,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Meziantou.Polyfill" Version="1.0.127">
+    <PackageReference Include="Meziantou.Polyfill" Version="1.0.140">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
diff --git a/src/core/IronPython/Runtime/PythonEncoding.cs b/src/core/IronPython/Runtime/PythonEncoding.cs
index da40a4bb9..042349f3b 100644
--- a/src/core/IronPython/Runtime/PythonEncoding.cs
+++ b/src/core/IronPython/Runtime/PythonEncoding.cs
@@ -1532,15 +1532,6 @@ public override unsafe int GetChars(byte* bytes, int byteCount, char* chars, int
 #if !NETCOREAPP
     // TODO: Move to IronPython.Runtime.Text
 
-    internal static class EncodingExtensions {
-        public static unsafe string GetString(this Encoding encoding, ReadOnlySpan<byte> bytes) {
-            fixed (byte* bytesPtr = &MemoryMarshal.GetReference(bytes)) {
-                return encoding.GetString(bytesPtr, bytes.Length);
-            }
-
-        }
-    }
-
     internal static class EncoderExtensions {
         public static unsafe int GetByteCount(this Encoder encoder, ReadOnlySpan<char> chars, bool flush) {
             fixed (char* pChars = &MemoryMarshal.GetReference(chars)) {