diff --git a/HelloOwinClient/HelloOwinClient.csproj b/HelloOwinClient/HelloOwinClient.csproj
index 7bd5f71..299ecaf 100644
--- a/HelloOwinClient/HelloOwinClient.csproj
+++ b/HelloOwinClient/HelloOwinClient.csproj
@@ -12,7 +12,7 @@
 
     <ItemGroup>
       <PackageReference Include="CmdLine" Version="1.0.7.509" />
-      <PackageReference Include="JetBrains.Annotations" Version="2022.3.1" />
+      <PackageReference Include="JetBrains.Annotations" Version="2023.2.0" />
       <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
       <PackageReference Include="System.Net.Http" Version="4.3.4" />
     </ItemGroup>
diff --git a/HelloOwinInterfaces/HelloOwinInterfaces.csproj b/HelloOwinInterfaces/HelloOwinInterfaces.csproj
index b90408a..c208cef 100644
--- a/HelloOwinInterfaces/HelloOwinInterfaces.csproj
+++ b/HelloOwinInterfaces/HelloOwinInterfaces.csproj
@@ -6,7 +6,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="JetBrains.Annotations" Version="2022.3.1" />
+      <PackageReference Include="JetBrains.Annotations" Version="2023.2.0" />
     </ItemGroup>
 
 </Project>
diff --git a/HelloOwinServer/HelloOwinServer.csproj b/HelloOwinServer/HelloOwinServer.csproj
index d608cec..72f185f 100644
--- a/HelloOwinServer/HelloOwinServer.csproj
+++ b/HelloOwinServer/HelloOwinServer.csproj
@@ -8,7 +8,7 @@
 
     <ItemGroup>
       <PackageReference Include="CmdLine" Version="1.0.7.509" />
-      <PackageReference Include="JetBrains.Annotations" Version="2022.3.1" />
+      <PackageReference Include="JetBrains.Annotations" Version="2023.2.0" />
       <PackageReference Include="Microsoft.Owin.SelfHost" Version="4.2.2" />
       <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     </ItemGroup>