diff --git a/src/Prometheus.Client.AspNetCore/Prometheus.Client.AspNetCore.csproj b/src/Prometheus.Client.AspNetCore/Prometheus.Client.AspNetCore.csproj
index aa92ab1..8351abb 100644
--- a/src/Prometheus.Client.AspNetCore/Prometheus.Client.AspNetCore.csproj
+++ b/src/Prometheus.Client.AspNetCore/Prometheus.Client.AspNetCore.csproj
@@ -3,9 +3,9 @@
     <Description>Middleware for the Prometheus.Client</Description>
     <Copyright>2020 © Serge K, Oleksandr Poliakov</Copyright>
     <AssemblyTitle>Prometheus.Client.AspNetCore</AssemblyTitle>
-    <VersionPrefix>4.1.2</VersionPrefix>
+    <VersionPrefix>4.2.0</VersionPrefix>
     <Authors>Serge K, Oleksandr Poliakov</Authors>
-    <TargetFrameworks>netstandard2.0;netcoreapp2.2;netstandard2.1;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;netstandard2.1;netcoreapp3.1</TargetFrameworks>
     <AssemblyName>Prometheus.Client.AspNetCore</AssemblyName>
     <PackageId>Prometheus.Client.AspNetCore</PackageId>
     <PackageTags>prometheus;metrics</PackageTags>
@@ -33,7 +33,7 @@
     </None>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Prometheus.Client" Version="4.2.0" />
+    <PackageReference Include="Prometheus.Client" Version="4.3.0" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
diff --git a/src/Prometheus.Client.AspNetCore/PrometheusExtensions.cs b/src/Prometheus.Client.AspNetCore/PrometheusExtensions.cs
index da887d3..efbec52 100644
--- a/src/Prometheus.Client.AspNetCore/PrometheusExtensions.cs
+++ b/src/Prometheus.Client.AspNetCore/PrometheusExtensions.cs
@@ -2,7 +2,6 @@
 using Prometheus.Client.Collectors;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
-using Prometheus.Client.Collectors.Abstractions;
 
 namespace Prometheus.Client.AspNetCore
 {
diff --git a/src/Prometheus.Client.AspNetCore/PrometheusOptions.cs b/src/Prometheus.Client.AspNetCore/PrometheusOptions.cs
index 3a093ca..a08f16c 100644
--- a/src/Prometheus.Client.AspNetCore/PrometheusOptions.cs
+++ b/src/Prometheus.Client.AspNetCore/PrometheusOptions.cs
@@ -1,4 +1,4 @@
-using Prometheus.Client.Collectors.Abstractions;
+using Prometheus.Client.Collectors;
 
 namespace Prometheus.Client.AspNetCore
 {