diff --git a/CBOR/CBOR.csproj b/CBOR/CBOR.csproj
index 925304d8..a559a3bb 100644
--- a/CBOR/CBOR.csproj
+++ b/CBOR/CBOR.csproj
@@ -52,7 +52,6 @@ Note that after version 4.5x, the CBOR library's repository will stop including
   <PropertyGroup Condition=" '$(Configuration)'=='Release' ">
     <DebugType>none</DebugType>
     <DocumentationFile>bin\Release\netstandard1.0\CBOR.xml</DocumentationFile>
-
   <CodeAnalysisRuleSet>rules.ruleset</CodeAnalysisRuleSet>
   </PropertyGroup>
   <ItemGroup>
@@ -69,5 +68,5 @@ Note that after version 4.5x, the CBOR library's repository will stop including
 <PackageReference Include="PeterO.Numbers" Version="1.8.2" />
 
 <PackageReference Include='PeterO.DataUtilities' Version='1.1.0'/>
-<PackageReference Include='Microsoft.CodeAnalysis.NetAnalyzers' PrivateAssets='All' Version='8.0.0'/></ItemGroup>
+<PackageReference Include='Microsoft.CodeAnalysis.NetAnalyzers' PrivateAssets='All' Version='9.0.0'/></ItemGroup>
                   </Project>
diff --git a/CBORDocs2/CBORDocs2.csproj b/CBORDocs2/CBORDocs2.csproj
index 22b15e6a..19aa7db5 100644
--- a/CBORDocs2/CBORDocs2.csproj
+++ b/CBORDocs2/CBORDocs2.csproj
@@ -14,7 +14,7 @@
     <AdditionalFiles Include='rules.ruleset'/>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include='Microsoft.CodeAnalysis.NetAnalyzers' PrivateAssets='All' Version='7.0.3'/>
+    <PackageReference Include='Microsoft.CodeAnalysis.NetAnalyzers' PrivateAssets='All' Version='9.0.0'/>
     <PackageReference Include='PeterO.URIUtility' Version='1.0.0'/>
     <PackageReference Include='PeterO.DataUtilities' Version='1.1.0'/>
     <PackageReference Include='StyleCop.Analyzers' PrivateAssets='All' Version='1.2.0-beta.354'/>
diff --git a/CBORTest/CBORTest.csproj b/CBORTest/CBORTest.csproj
index dbbaa48e..fb457593 100644
--- a/CBORTest/CBORTest.csproj
+++ b/CBORTest/CBORTest.csproj
@@ -18,7 +18,7 @@
       <ItemGroup>
         <PackageReference Include='Microsoft.NET.Test.Sdk' Version='15.9.0'/>
         <PackageReference Include='NUnit' Version='3.13.2'/>
-        <PackageReference Include='Microsoft.CodeAnalysis.NetAnalyzers' PrivateAssets='All' Version='7.0.3'/>
+        <PackageReference Include='Microsoft.CodeAnalysis.NetAnalyzers' PrivateAssets='All' Version='9.0.0'/>
         <PackageReference Include='NUnit3TestAdapter' Version='3.16.1'>
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
           <PrivateAssets>all</PrivateAssets>