diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index edede21d862d19..05f4fcd4639737 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -361,18 +361,18 @@
       <Uri>https://github.com/dotnet/runtime-assets</Uri>
       <Sha>7f63c6a8c114b8f8776047e86a1d6f31ab293c50</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Net.Compilers.Toolset" Version="4.9.0-2.23575.1">
+    <Dependency Name="Microsoft.Net.Compilers.Toolset" Version="4.9.0-3.23605.11">
       <Uri>https://github.com/dotnet/roslyn</Uri>
-      <Sha>5d09d2ed4ae24ed3c64aa487f606cea326fef378</Sha>
+      <Sha>92a930f3247040ec9c077dac9bcdf0294745b339</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.CodeAnalysis" Version="4.9.0-2.23575.1">
+    <Dependency Name="Microsoft.CodeAnalysis" Version="4.9.0-3.23605.11">
       <Uri>https://github.com/dotnet/roslyn</Uri>
-      <Sha>5d09d2ed4ae24ed3c64aa487f606cea326fef378</Sha>
+      <Sha>92a930f3247040ec9c077dac9bcdf0294745b339</Sha>
       <SourceBuild RepoName="roslyn" ManagedOnly="true" />
     </Dependency>
-    <Dependency Name="Microsoft.CodeAnalysis.CSharp" Version="4.9.0-2.23575.1">
+    <Dependency Name="Microsoft.CodeAnalysis.CSharp" Version="4.9.0-3.23605.11">
       <Uri>https://github.com/dotnet/roslyn</Uri>
-      <Sha>5d09d2ed4ae24ed3c64aa487f606cea326fef378</Sha>
+      <Sha>92a930f3247040ec9c077dac9bcdf0294745b339</Sha>
     </Dependency>
     <Dependency Name="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0-beta1.23523.1">
       <Uri>https://github.com/dotnet/roslyn-analyzers</Uri>
diff --git a/eng/Versions.props b/eng/Versions.props
index 556b61d898a6d1..cca35023a7a6ac 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -39,9 +39,9 @@
       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>4.9.0-2.23575.1</MicrosoftCodeAnalysisCSharpVersion>
-    <MicrosoftCodeAnalysisVersion>4.9.0-2.23575.1</MicrosoftCodeAnalysisVersion>
-    <MicrosoftNetCompilersToolsetVersion>4.9.0-2.23575.1</MicrosoftNetCompilersToolsetVersion>
+    <MicrosoftCodeAnalysisCSharpVersion>4.9.0-3.23605.11</MicrosoftCodeAnalysisCSharpVersion>
+    <MicrosoftCodeAnalysisVersion>4.9.0-3.23605.11</MicrosoftCodeAnalysisVersion>
+    <MicrosoftNetCompilersToolsetVersion>4.9.0-3.23605.11</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.Data.Common/src/System/Data/SQLTypes/SQLDecimal.cs b/src/libraries/System.Data.Common/src/System/Data/SQLTypes/SQLDecimal.cs
index 7bf9859a571864..309fc79d90bbc5 100644
--- a/src/libraries/System.Data.Common/src/System/Data/SQLTypes/SQLDecimal.cs
+++ b/src/libraries/System.Data.Common/src/System/Data/SQLTypes/SQLDecimal.cs
@@ -1277,7 +1277,7 @@ public static explicit operator decimal(SqlDecimal x)
             // negate all operands including result.
             if (!fMySignPos)
             {
-                fMySignPos = !fMySignPos;
+                // fMySignPos = !fMySignPos;
                 fOpSignPos = !fOpSignPos;
                 fResSignPos = !fResSignPos;
             }
@@ -2073,7 +2073,7 @@ private byte BActualPrec()
 
             int ciulU = _bLen;
             int Prec;
-            uint ulRem;
+            // uint ulRem;
 
             if (ciulU == 1)
             {
@@ -2089,7 +2089,7 @@ private byte BActualPrec()
                 Prec = 0;
                 do
                 {
-                    MpDiv1(rgulU, ref ciulU, 1000000000, out ulRem);
+                    MpDiv1(rgulU, ref ciulU, 1000000000, out _ /* ulRem */);
                     Prec += 9;
                 }
                 while (ciulU > 2);
@@ -2158,7 +2158,7 @@ private void MultByULong(uint uiMultiplier)
             int iDataMax = _bLen; // How many UI4s currently in *this
 
             ulong dwlAccum = 0;       // accumulated sum
-            ulong dwlNextAccum = 0;   // accumulation past dwlAccum
+            ulong dwlNextAccum;       // accumulation past dwlAccum
             int iData;              // which UI4 in *This we are on.
 
             Span<uint> rguiData = [_data1, _data2, _data3, _data4];
@@ -2212,7 +2212,7 @@ private uint DivByULong(uint iDivisor)
         {
             ulong dwlDivisor = iDivisor;
             ulong dwlAccum = 0;           //Accumulated sum
-            uint ulQuotientCur = 0;      // Value of the current UI4 of the quotient
+            uint ulQuotientCur;          // Value of the current UI4 of the quotient
             bool fAllZero = true;    // All of the quotient (so far) has been 0
             int iData;              //Which UI4 currently on