diff --git a/eng/SourceBuildPrebuiltBaseline.xml b/eng/SourceBuildPrebuiltBaseline.xml
index 69be84119be4d9..7298ab842f0223 100644
--- a/eng/SourceBuildPrebuiltBaseline.xml
+++ b/eng/SourceBuildPrebuiltBaseline.xml
@@ -36,5 +36,18 @@
     <UsagePattern IdentityGlob="System.IO.Pipelines/7.0.0" />
     <UsagePattern IdentityGlob="System.IO.Pipelines/8.0.*" />
     <UsagePattern IdentityGlob="System.Security.Cryptography.Pkcs/5.0.0" />
+
+    <!-- Dependencies of Roslyn, replaced with live packages during full source build
+         https://github.com/dotnet/runtime/pull/112937#discussion_r2022951143 -->
+    <UsagePattern IdentityGlob="Microsoft.Bcl.AsyncInterfaces/9.0.0" />
+    <UsagePattern IdentityGlob="System.Collections.Immutable/9.0.0" />
+    <UsagePattern IdentityGlob="System.Composition/9.0.0" />
+    <UsagePattern IdentityGlob="System.Composition.AttributedModel/9.0.0" />
+    <UsagePattern IdentityGlob="System.Composition.Convention/9.0.0" />
+    <UsagePattern IdentityGlob="System.Composition.Hosting/9.0.0" />
+    <UsagePattern IdentityGlob="System.Composition.Runtime/9.0.0" />
+    <UsagePattern IdentityGlob="System.Composition.TypedParts/9.0.0" />
+    <UsagePattern IdentityGlob="System.IO.Pipelines/9.0.0" />
+    <UsagePattern IdentityGlob="System.Reflection.Metadata/9.0.0" />
   </IgnorePatterns>
 </UsageData>
diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 51772634f17465..b815db5acf103b 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -376,17 +376,17 @@
       <Uri>https://github.com/dotnet/runtime-assets</Uri>
       <Sha>207b0aac7c32b425a684734a70ba78bfdddb9e48</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Net.Compilers.Toolset" Version="4.14.0-2.25121.3">
+    <Dependency Name="Microsoft.Net.Compilers.Toolset" Version="4.14.0-3.25179.1">
       <Uri>https://github.com/dotnet/roslyn</Uri>
-      <Sha>bfe9d9f9059008d919d867fe5bdfabfe8b6ed69d</Sha>
+      <Sha>304768b76e90f5d224b745e3a03cfc5e9509baf6</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.CodeAnalysis" Version="4.14.0-2.25121.3">
+    <Dependency Name="Microsoft.CodeAnalysis" Version="4.14.0-3.25179.1">
       <Uri>https://github.com/dotnet/roslyn</Uri>
-      <Sha>bfe9d9f9059008d919d867fe5bdfabfe8b6ed69d</Sha>
+      <Sha>304768b76e90f5d224b745e3a03cfc5e9509baf6</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.CodeAnalysis.CSharp" Version="4.14.0-2.25121.3">
+    <Dependency Name="Microsoft.CodeAnalysis.CSharp" Version="4.14.0-3.25179.1">
       <Uri>https://github.com/dotnet/roslyn</Uri>
-      <Sha>bfe9d9f9059008d919d867fe5bdfabfe8b6ed69d</Sha>
+      <Sha>304768b76e90f5d224b745e3a03cfc5e9509baf6</Sha>
     </Dependency>
     <Dependency Name="Microsoft.CodeAnalysis.Analyzers" Version="3.12.0-beta1.25081.1">
       <Uri>https://github.com/dotnet/roslyn-analyzers</Uri>
@@ -397,9 +397,9 @@
       <Sha>8fe7aeb135c64e095f43292c427453858d937184</Sha>
     </Dependency>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.roslyn" Version="4.14.0-2.25121.3">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.roslyn" Version="4.14.0-3.25179.1">
       <Uri>https://github.com/dotnet/roslyn</Uri>
-      <Sha>bfe9d9f9059008d919d867fe5bdfabfe8b6ed69d</Sha>
+      <Sha>304768b76e90f5d224b745e3a03cfc5e9509baf6</Sha>
       <SourceBuild RepoName="roslyn" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="Microsoft.DotNet.ApiCompat.Task" Version="10.0.100-preview.3.25126.5">
diff --git a/eng/Versions.props b/eng/Versions.props
index e859b281fd4b93..294dfe13f5329d 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -44,9 +44,9 @@
       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>4.14.0-2.25121.3</MicrosoftCodeAnalysisCSharpVersion>
-    <MicrosoftCodeAnalysisVersion>4.14.0-2.25121.3</MicrosoftCodeAnalysisVersion>
-    <MicrosoftNetCompilersToolsetVersion>4.14.0-2.25121.3</MicrosoftNetCompilersToolsetVersion>
+    <MicrosoftCodeAnalysisCSharpVersion>4.14.0-3.25179.1</MicrosoftCodeAnalysisCSharpVersion>
+    <MicrosoftCodeAnalysisVersion>4.14.0-3.25179.1</MicrosoftCodeAnalysisVersion>
+    <MicrosoftNetCompilersToolsetVersion>4.14.0-3.25179.1</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/libraries/System.Memory/tests/MemoryMarshal/GetArrayDataReference.cs b/src/libraries/System.Memory/tests/MemoryMarshal/GetArrayDataReference.cs
index c3478421c358c1..d76867c5c76820 100644
--- a/src/libraries/System.Memory/tests/MemoryMarshal/GetArrayDataReference.cs
+++ b/src/libraries/System.Memory/tests/MemoryMarshal/GetArrayDataReference.cs
@@ -90,7 +90,9 @@ public static void GetArrayDataReference_IgnoresArrayVarianceChecks()
 
         private sealed class RawObject
         {
+            #pragma warning disable CS0649 // Field is never assigned to, and will always have its default value null
             internal byte Data;
+            #pragma warning restore CS0649
         }
     }
 }
diff --git a/src/libraries/System.Runtime/tests/System.Reflection.Tests/FieldInfoTests.cs b/src/libraries/System.Runtime/tests/System.Reflection.Tests/FieldInfoTests.cs
index c3ff97fb342297..d8c6425f3b1a72 100644
--- a/src/libraries/System.Runtime/tests/System.Reflection.Tests/FieldInfoTests.cs
+++ b/src/libraries/System.Runtime/tests/System.Reflection.Tests/FieldInfoTests.cs
@@ -868,7 +868,9 @@ public static class SettingsForMyTypeThatThrowsInClassInitializer
 
         private class RawData
         {
+            #pragma warning disable CS0649 // Field is never assigned to, and will always have its default value null
             public byte Data;
+            #pragma warning restore CS0649
         }
     }
 }