diff --git a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/CodeAnalysis/RequiresUnreferencedCodeAttribute.cs b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/CodeAnalysis/RequiresUnreferencedCodeAttribute.cs
index bf99d389fe820..bcb31753c4084 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/CodeAnalysis/RequiresUnreferencedCodeAttribute.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/CodeAnalysis/RequiresUnreferencedCodeAttribute.cs
@@ -11,7 +11,7 @@ namespace System.Diagnostics.CodeAnalysis
     /// This allows tools to understand which methods are unsafe to call when removing unreferenced
     /// code from an application.
     /// </remarks>
-    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor, Inherited = false)]
+    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Class, Inherited = false)]
 #if SYSTEM_PRIVATE_CORELIB
     public
 #else
diff --git a/src/libraries/System.Runtime/ref/System.Runtime.cs b/src/libraries/System.Runtime/ref/System.Runtime.cs
index 97f212162c9d6..351f332559d95 100644
--- a/src/libraries/System.Runtime/ref/System.Runtime.cs
+++ b/src/libraries/System.Runtime/ref/System.Runtime.cs
@@ -6010,7 +6010,7 @@ public RequiresAssemblyFilesAttribute() { }
         public string? Message { get { throw null; } set { } }
         public string? Url { get { throw null; } set { } }
     }
-    [System.AttributeUsageAttribute(System.AttributeTargets.Constructor | System.AttributeTargets.Method, Inherited=false)]
+    [System.AttributeUsageAttribute(System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Method, Inherited=false)]
     public sealed partial class RequiresUnreferencedCodeAttribute : System.Attribute
     {
         public RequiresUnreferencedCodeAttribute(string message) { }
diff --git a/src/libraries/shims/ApiCompatBaseline.PreviousNetCoreApp.txt b/src/libraries/shims/ApiCompatBaseline.PreviousNetCoreApp.txt
index 401f0a5f0ba15..3809de65d8200 100644
--- a/src/libraries/shims/ApiCompatBaseline.PreviousNetCoreApp.txt
+++ b/src/libraries/shims/ApiCompatBaseline.PreviousNetCoreApp.txt
@@ -18,10 +18,11 @@ CannotRemoveAttribute : Attribute 'System.Diagnostics.CodeAnalysis.AllowNullAttr
 Compat issues with assembly System.Net.Primitives:
 CannotRemoveAttribute : Attribute 'System.Diagnostics.CodeAnalysis.AllowNullAttribute' exists on parameter 'value' on member 'System.Net.Cookie.Name.set(System.String)' in the contract but not the implementation.
 Compat issues with assembly System.Runtime:
+CannotChangeAttribute : Attribute 'System.AttributeUsageAttribute' on 'System.Diagnostics.CodeAnalysis.RequiresUnreferencedCodeAttribute' changed from '[AttributeUsageAttribute(AttributeTargets.Constructor | AttributeTargets.Method, Inherited=false)]' in the contract to '[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Constructor | AttributeTargets.Method, Inherited=false)]' in the implementation.
 CannotChangeAttribute : Attribute 'System.AttributeUsageAttribute' on 'System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAttribute' changed from '[AttributeUsageAttribute(AttributeTargets.Field | AttributeTargets.GenericParameter | AttributeTargets.Method | AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.ReturnValue, Inherited=false)]' in the contract to '[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Field | AttributeTargets.GenericParameter | AttributeTargets.Interface | AttributeTargets.Method | AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.ReturnValue | AttributeTargets.Struct, Inherited=false)]' in the implementation.
 CannotChangeAttribute : Attribute 'System.AttributeUsageAttribute' on 'System.Runtime.Versioning.SupportedOSPlatformAttribute' changed from '[AttributeUsageAttribute(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Constructor | AttributeTargets.Enum | AttributeTargets.Event | AttributeTargets.Field | AttributeTargets.Method | AttributeTargets.Module | AttributeTargets.Property | AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]' in the contract to '[AttributeUsageAttribute(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Constructor | AttributeTargets.Enum | AttributeTargets.Event | AttributeTargets.Field | AttributeTargets.Interface | AttributeTargets.Method | AttributeTargets.Module | AttributeTargets.Property | AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]' in the implementation.
 CannotChangeAttribute : Attribute 'System.AttributeUsageAttribute' on 'System.Runtime.Versioning.UnsupportedOSPlatformAttribute' changed from '[AttributeUsageAttribute(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Constructor | AttributeTargets.Enum | AttributeTargets.Event | AttributeTargets.Field | AttributeTargets.Method | AttributeTargets.Module | AttributeTargets.Property | AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]' in the contract to '[AttributeUsageAttribute(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Constructor | AttributeTargets.Enum | AttributeTargets.Event | AttributeTargets.Field | AttributeTargets.Interface | AttributeTargets.Method | AttributeTargets.Module | AttributeTargets.Property | AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]' in the implementation.
+CannotChangeAttribute : Attribute 'System.AttributeUsageAttribute' on 'System.Runtime.CompilerServices.AsyncMethodBuilderAttribute' changed from '[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Delegate | AttributeTargets.Enum | AttributeTargets.Interface | AttributeTargets.Struct, Inherited=false, AllowMultiple=false)]' in the contract to '[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Delegate | AttributeTargets.Enum | AttributeTargets.Interface | AttributeTargets.Method | AttributeTargets.Struct, Inherited=false, AllowMultiple=false)]' in the implementation.
 Compat issues with assembly System.Security.Cryptography.Algorithms:
 CannotRemoveAttribute : Attribute 'System.Runtime.Versioning.UnsupportedOSPlatformAttribute' exists on 'System.Security.Cryptography.CryptoConfig' in the contract but not the implementation.
-CannotChangeAttribute : Attribute 'System.AttributeUsageAttribute' on 'System.Runtime.CompilerServices.AsyncMethodBuilderAttribute' changed from '[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Delegate | AttributeTargets.Enum | AttributeTargets.Interface | AttributeTargets.Struct, Inherited=false, AllowMultiple=false)]' in the contract to '[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Delegate | AttributeTargets.Enum | AttributeTargets.Interface | AttributeTargets.Method | AttributeTargets.Struct, Inherited=false, AllowMultiple=false)]' in the implementation.
-Total Issues: 16
+Total Issues: 18