diff --git a/src/libraries/System.Resources.Extensions/ref/System.Resources.Extensions.cs b/src/libraries/System.Resources.Extensions/ref/System.Resources.Extensions.cs
index 78bf26847dbe2..9c043b6a585d4 100644
--- a/src/libraries/System.Resources.Extensions/ref/System.Resources.Extensions.cs
+++ b/src/libraries/System.Resources.Extensions/ref/System.Resources.Extensions.cs
@@ -20,6 +20,7 @@ public sealed partial class PreserializedResourceWriter : System.IDisposable, Sy
         public PreserializedResourceWriter(System.IO.Stream stream) { }
         public PreserializedResourceWriter(string fileName) { }
         public void AddActivatorResource(string name, System.IO.Stream value, string typeName, bool closeAfterWrite = false) { }
+        [System.ObsoleteAttribute("BinaryFormatter serialization is obsolete and should not be used. See https://aka.ms/binaryformatter for more information.", DiagnosticId = "SYSLIB0011", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
         public void AddBinaryFormattedResource(string name, byte[] value, string? typeName = null) { }
         public void AddResource(string name, byte[]? value) { }
         public void AddResource(string name, System.IO.Stream? value, bool closeAfterWrite = false) { }
diff --git a/src/libraries/System.Resources.Extensions/ref/System.Resources.Extensions.csproj b/src/libraries/System.Resources.Extensions/ref/System.Resources.Extensions.csproj
index daef980d13281..099818780c1d8 100644
--- a/src/libraries/System.Resources.Extensions/ref/System.Resources.Extensions.csproj
+++ b/src/libraries/System.Resources.Extensions/ref/System.Resources.Extensions.csproj
@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum);netstandard2.0;$(NetFrameworkMinimum)</TargetFrameworks>
+    <IncludeInternalObsoleteAttribute>true</IncludeInternalObsoleteAttribute>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/libraries/System.Resources.Extensions/src/System.Resources.Extensions.csproj b/src/libraries/System.Resources.Extensions/src/System.Resources.Extensions.csproj
index 508462eb6379f..02d2e48dd5b55 100644
--- a/src/libraries/System.Resources.Extensions/src/System.Resources.Extensions.csproj
+++ b/src/libraries/System.Resources.Extensions/src/System.Resources.Extensions.csproj
@@ -4,6 +4,7 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <DefineConstants>$(DefineConstants);RESOURCES_EXTENSIONS</DefineConstants>
     <EnableAOTAnalyzer>false</EnableAOTAnalyzer>
+    <IncludeInternalObsoleteAttribute>true</IncludeInternalObsoleteAttribute>
     <IsPackable>true</IsPackable>
     <SuggestedBindingRedirectsPackageFile>$(BaseIntermediateOutputPath)SuggestedBindingRedirects.targets</SuggestedBindingRedirectsPackageFile>
     <BeforePack>$(BeforePack);GeneratePackageTargetsFile</BeforePack>
@@ -15,6 +16,8 @@ System.Resources.Extensions.PreserializedResourceWriter</PackageDescription>
   </PropertyGroup>
 
   <ItemGroup>
+    <Compile Include="$(CommonPath)System\Obsoletions.cs"
+             Link="Common\System\Obsoletions.cs" />
     <Compile Include="$(CommonPath)System\Resources\ResourceWriter.cs"
              Link="System\Resources\Extensions\ResourceWriter.cs" />
     <Compile Include="$(CoreLibSharedDir)System\IO\PinnedBufferMemoryStream.cs"
diff --git a/src/libraries/System.Resources.Extensions/src/System/Resources/Extensions/PreserializedResourceWriter.cs b/src/libraries/System.Resources.Extensions/src/System/Resources/Extensions/PreserializedResourceWriter.cs
index 6940943d5dc7c..2983a04b4acb2 100644
--- a/src/libraries/System.Resources.Extensions/src/System/Resources/Extensions/PreserializedResourceWriter.cs
+++ b/src/libraries/System.Resources.Extensions/src/System/Resources/Extensions/PreserializedResourceWriter.cs
@@ -152,6 +152,7 @@ public void AddTypeConverterResource(string name, byte[] value, string typeName)
         /// <param name="name">Resource name</param>
         /// <param name="value">Value of the resource in byte[] form understood by BinaryFormatter</param>
         /// <param name="typeName">Assembly qualified type name of the resource</param>
+        [Obsolete(Obsoletions.BinaryFormatterMessage, DiagnosticId = Obsoletions.BinaryFormatterDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
         public void AddBinaryFormattedResource(string name, byte[] value, string? typeName = null)
         {
             if (name is null)