diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index f405e5c4f905b8..1f70fad1308aa3 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -354,18 +354,18 @@
       <Uri>https://github.com/dotnet/runtime-assets</Uri>
       <Sha>7333879999019e28e47f58879180cba54f5e1843</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Net.Compilers.Toolset" Version="4.7.0-3.23373.1">
+    <Dependency Name="Microsoft.Net.Compilers.Toolset" Version="4.8.0-1.23401.10">
       <Uri>https://github.com/dotnet/roslyn</Uri>
-      <Sha>7829f6b85177e96de89bc67f32b61d74ac590f5a</Sha>
+      <Sha>b3dc95ebc77bcdf064617c3c4a85d1da0ea911ac</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.CodeAnalysis" Version="4.7.0-3.23373.1">
+    <Dependency Name="Microsoft.CodeAnalysis" Version="4.8.0-1.23401.10">
       <Uri>https://github.com/dotnet/roslyn</Uri>
-      <Sha>7829f6b85177e96de89bc67f32b61d74ac590f5a</Sha>
+      <Sha>b3dc95ebc77bcdf064617c3c4a85d1da0ea911ac</Sha>
       <SourceBuild RepoName="roslyn" ManagedOnly="true" />
     </Dependency>
-    <Dependency Name="Microsoft.CodeAnalysis.CSharp" Version="4.7.0-3.23373.1">
+    <Dependency Name="Microsoft.CodeAnalysis.CSharp" Version="4.8.0-1.23401.10">
       <Uri>https://github.com/dotnet/roslyn</Uri>
-      <Sha>7829f6b85177e96de89bc67f32b61d74ac590f5a</Sha>
+      <Sha>b3dc95ebc77bcdf064617c3c4a85d1da0ea911ac</Sha>
     </Dependency>
     <Dependency Name="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0-beta1.23364.2">
       <Uri>https://github.com/dotnet/roslyn-analyzers</Uri>
diff --git a/eng/Versions.props b/eng/Versions.props
index cbfb12fc8a2900..f849c8e3cdd112 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -40,9 +40,9 @@
       Any tools that contribute to the design-time experience should use the MicrosoftCodeAnalysisVersion_LatestVS property above to ensure
       they do not break the local dev experience.
     -->
-    <MicrosoftCodeAnalysisCSharpVersion>4.7.0-3.23373.1</MicrosoftCodeAnalysisCSharpVersion>
-    <MicrosoftCodeAnalysisVersion>4.7.0-3.23373.1</MicrosoftCodeAnalysisVersion>
-    <MicrosoftNetCompilersToolsetVersion>4.7.0-3.23373.1</MicrosoftNetCompilersToolsetVersion>
+    <MicrosoftCodeAnalysisCSharpVersion>4.8.0-1.23401.10</MicrosoftCodeAnalysisCSharpVersion>
+    <MicrosoftCodeAnalysisVersion>4.8.0-1.23401.10</MicrosoftCodeAnalysisVersion>
+    <MicrosoftNetCompilersToolsetVersion>4.8.0-1.23401.10</MicrosoftNetCompilersToolsetVersion>
   </PropertyGroup>
   <!--
     For source generator support we need to target multiple versions of Roslyn in order to be able to run on older versions of Roslyn.
diff --git a/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Reflection/DynamicInvokeInfo.cs b/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Reflection/DynamicInvokeInfo.cs
index 2cda655a816d6a..04a0b66662cda3 100644
--- a/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Reflection/DynamicInvokeInfo.cs
+++ b/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Reflection/DynamicInvokeInfo.cs
@@ -887,7 +887,12 @@ internal ref struct StackAllocatedArguments
         [InlineArray(MaxStackAllocArgCount)]
         internal ref struct StackAllocatedByRefs
         {
+            // We're intentionally taking advantage of the runtime functionality, even if the language functionality won't work
+            // CS9184: 'Inline arrays' language feature is not supported for inline array types with element field which is either a 'ref' field, or has type that is not valid as a type argument.
+
+#pragma warning disable CS9184
             internal ref byte _arg0;
+#pragma warning restore CS9184
         }
     }
 }
diff --git a/src/libraries/System.Private.CoreLib/src/System/ParamsArray.cs b/src/libraries/System.Private.CoreLib/src/System/ParamsArray.cs
index d1bf55b7dc7a5f..b1dde8c0301385 100644
--- a/src/libraries/System.Private.CoreLib/src/System/ParamsArray.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/ParamsArray.cs
@@ -12,15 +12,11 @@
 
 namespace System
 {
-    [InlineArray(Length)]
+    [InlineArray(2)]
     internal struct TwoObjects
     {
-        private const int Length = 2;
         internal object? Arg0;
 
-        [UnscopedRef]
-        private ref object? this[int i] => ref Unsafe.Add(ref Arg0, i);
-
         public TwoObjects(object? arg0, object? arg1)
         {
             this[0] = arg0;
@@ -28,15 +24,11 @@ public TwoObjects(object? arg0, object? arg1)
         }
     }
 
-    [InlineArray(Length)]
+    [InlineArray(3)]
     internal struct ThreeObjects
     {
-        private const int Length = 3;
         internal object? Arg0;
 
-        [UnscopedRef]
-        private ref object? this[int i] => ref Unsafe.Add(ref Arg0, i);
-
         public ThreeObjects(object? arg0, object? arg1, object? arg2)
         {
             this[0] = arg0;
diff --git a/src/libraries/System.Private.CoreLib/src/System/Reflection/MethodBase.cs b/src/libraries/System.Private.CoreLib/src/System/Reflection/MethodBase.cs
index fb07f75f779b0e..d4dd02b06da47c 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Reflection/MethodBase.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Reflection/MethodBase.cs
@@ -234,7 +234,12 @@ internal ref struct StackAllocatedArgumentsWithCopyBack
         [InlineArray(MaxStackAllocArgCount)]
         internal ref struct StackAllocatedByRefs
         {
+            // We're intentionally taking advantage of the runtime functionality, even if the language functionality won't work
+            // CS9184: 'Inline arrays' language feature is not supported for inline array types with element field which is either a 'ref' field, or has type that is not valid as a type argument.
+
+#pragma warning disable CS9184
             internal ref byte _arg0;
+#pragma warning restore CS9184
         }
 #endif
     }
diff --git a/src/libraries/System.Reflection.MetadataLoadContext/tests/src/SampleMetadata/SampleMetadata.cs b/src/libraries/System.Reflection.MetadataLoadContext/tests/src/SampleMetadata/SampleMetadata.cs
index 9f01b3b5efcb2f..861e54b6189780 100644
--- a/src/libraries/System.Reflection.MetadataLoadContext/tests/src/SampleMetadata/SampleMetadata.cs
+++ b/src/libraries/System.Reflection.MetadataLoadContext/tests/src/SampleMetadata/SampleMetadata.cs
@@ -377,14 +377,24 @@ public class MarshalAsHolders
         [MarshalAs(UnmanagedType.IDispatch, IidParameterIndex = 42)]
         public int F4;
 
+        // We are explicitly testing ByValArray without a SizeConst
+        // CS9125: Attribute parameter 'SizeConst' must be specified.
+
+#pragma warning disable CS9125
         [MarshalAs(UnmanagedType.ByValArray)]
         public int F5;
+#pragma warning restore CS9125
 
         [MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)]
         public int F6;
 
+        // We are explicitly testing ByValArray without a SizeConst
+        // CS9125: Attribute parameter 'SizeConst' must be specified.
+
+#pragma warning disable CS9125
         [MarshalAs(UnmanagedType.ByValArray, ArraySubType = UnmanagedType.FunctionPtr)]
         public int F7;
+#pragma warning restore CS9125
 
         [MarshalAs(UnmanagedType.ByValArray, SizeConst = 87, ArraySubType = UnmanagedType.FunctionPtr)]
         public int F8;