diff --git a/FastGithub.Dns/GithubRequestResolver.cs b/FastGithub.Dns/GithubRequestResolver.cs
index c54201e..3bfa8c9 100644
--- a/FastGithub.Dns/GithubRequestResolver.cs
+++ b/FastGithub.Dns/GithubRequestResolver.cs
@@ -5,7 +5,6 @@ using FastGithub.Scanner;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
-using System;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
diff --git a/FastGithub/FastGithub.csproj b/FastGithub/FastGithub.csproj
index 9175207..907e1a3 100644
--- a/FastGithub/FastGithub.csproj
+++ b/FastGithub/FastGithub.csproj
@@ -5,7 +5,7 @@
     <Nullable>enable</Nullable>
     <TargetFrameworks>net5.0;net6.0</TargetFrameworks>
     <EnableCompressionInSingleFile>true</EnableCompressionInSingleFile>
-    <Version>1.0.0-beta1</Version>
+    <Version>1.0.0-beta2</Version>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)' == 'net6.0'">
diff --git a/FastGithub/appsettings.json b/FastGithub/appsettings.json
index 5172bd6..36b51a5 100644
--- a/FastGithub/appsettings.json
+++ b/FastGithub/appsettings.json
@@ -1,7 +1,7 @@
 {
   "Dns": {
     "UpStream": "114.114.114.114",
-    "GithubTTL": "00.10.00"
+    "GithubTTL": "00:10:00"
   },
   "Github": {
     "ScanAllInterval": "02:00:00", // 完整扫描时间间隔