diff --git a/src/SKIT.FlurlHttpClient.Wechat.Api/SKIT.FlurlHttpClient.Wechat.Api.csproj b/src/SKIT.FlurlHttpClient.Wechat.Api/SKIT.FlurlHttpClient.Wechat.Api.csproj
index a729e21d..f9aaa6e1 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.Api/SKIT.FlurlHttpClient.Wechat.Api.csproj
+++ b/src/SKIT.FlurlHttpClient.Wechat.Api/SKIT.FlurlHttpClient.Wechat.Api.csproj
@@ -40,7 +40,7 @@
     </ItemGroup>
 
 	<ItemGroup>
-        <PackageReference Include="BouncyCastle.Cryptography" Version="2.3.1" />
+        <PackageReference Include="BouncyCastle.Cryptography" Version="2.4.0" />
 		<PackageReference Include="SKIT.FlurlHttpClient.Common" Version="3.0.0" />
 	</ItemGroup>
 
diff --git a/src/SKIT.FlurlHttpClient.Wechat.TenpayBusiness/SKIT.FlurlHttpClient.Wechat.TenpayBusiness.csproj b/src/SKIT.FlurlHttpClient.Wechat.TenpayBusiness/SKIT.FlurlHttpClient.Wechat.TenpayBusiness.csproj
index 0c27960a..9c6b8962 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.TenpayBusiness/SKIT.FlurlHttpClient.Wechat.TenpayBusiness.csproj
+++ b/src/SKIT.FlurlHttpClient.Wechat.TenpayBusiness/SKIT.FlurlHttpClient.Wechat.TenpayBusiness.csproj
@@ -40,7 +40,7 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="BouncyCastle.Cryptography" Version="2.3.1" />
+        <PackageReference Include="BouncyCastle.Cryptography" Version="2.4.0" />
         <PackageReference Include="System.ValueTuple" Version="4.5.0" Condition="'$(TargetFramework)' == 'net462'" />
 		<PackageReference Include="SKIT.FlurlHttpClient.Common" Version="3.0.0" />
     </ItemGroup>
diff --git a/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/SKIT.FlurlHttpClient.Wechat.TenpayV3.csproj b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/SKIT.FlurlHttpClient.Wechat.TenpayV3.csproj
index 79fca509..8911094b 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/SKIT.FlurlHttpClient.Wechat.TenpayV3.csproj
+++ b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/SKIT.FlurlHttpClient.Wechat.TenpayV3.csproj
@@ -40,7 +40,7 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="BouncyCastle.Cryptography" Version="2.3.1" />
+        <PackageReference Include="BouncyCastle.Cryptography" Version="2.4.0" />
         <PackageReference Include="System.ValueTuple" Version="4.5.0" Condition="'$(TargetFramework)' == 'net462'" />
         <PackageReference Include="SKIT.FlurlHttpClient.Common" Version="3.0.0" />
     </ItemGroup>
diff --git a/src/SKIT.FlurlHttpClient.Wechat.Work/SKIT.FlurlHttpClient.Wechat.Work.csproj b/src/SKIT.FlurlHttpClient.Wechat.Work/SKIT.FlurlHttpClient.Wechat.Work.csproj
index 38522819..18af733f 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.Work/SKIT.FlurlHttpClient.Wechat.Work.csproj
+++ b/src/SKIT.FlurlHttpClient.Wechat.Work/SKIT.FlurlHttpClient.Wechat.Work.csproj
@@ -47,7 +47,7 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="BouncyCastle.Cryptography" Version="2.3.1" />
+        <PackageReference Include="BouncyCastle.Cryptography" Version="2.4.0" />
         <PackageReference Include="SKIT.FlurlHttpClient.Common" Version="3.0.0" />
     </ItemGroup>