diff --git a/src/Senparc.Log/Senparc.Log.csproj b/src/Senparc.Log/Senparc.Log.csproj
index e221f720..bf9048df 100644
--- a/src/Senparc.Log/Senparc.Log.csproj
+++ b/src/Senparc.Log/Senparc.Log.csproj
@@ -9,7 +9,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="log4net" Version="2.0.8" />
+    <PackageReference Include="log4net" Version="2.0.10" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Senparc.SMS.Tests/Senparc.SMS.Tests.csproj b/src/Senparc.SMS.Tests/Senparc.SMS.Tests.csproj
index c4dadeef..549bca74 100644
--- a/src/Senparc.SMS.Tests/Senparc.SMS.Tests.csproj
+++ b/src/Senparc.SMS.Tests/Senparc.SMS.Tests.csproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="log4net" Version="2.0.8" />
+    <PackageReference Include="log4net" Version="2.0.10" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.4.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="2.1.0" />
     <PackageReference Include="MSTest.TestFramework" Version="2.1.0" />