diff --git a/Directory.Packages.props b/Directory.Packages.props
index 7f6ae85..f2a951c 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -58,7 +58,7 @@
     <PackageVersion Include="coverlet.collector" Version="10.0.1" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.8" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
-    <PackageVersion Include="NSubstitute" Version="5.3.0" />
+    <PackageVersion Include="NSubstitute" Version="6.0.0" />
     <PackageVersion Include="Testcontainers.PostgreSql" Version="4.7.0" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageVersion Include="xunit.v3" Version="3.2.2" />
diff --git a/tests/AndreGoepel.AppFoundation.MailService.Tests/packages.lock.json b/tests/AndreGoepel.AppFoundation.MailService.Tests/packages.lock.json
index b513d6a..b26f7f0 100644
--- a/tests/AndreGoepel.AppFoundation.MailService.Tests/packages.lock.json
+++ b/tests/AndreGoepel.AppFoundation.MailService.Tests/packages.lock.json
@@ -20,9 +20,9 @@
       },
       "NSubstitute": {
         "type": "Direct",
-        "requested": "[5.3.0, )",
-        "resolved": "5.3.0",
-        "contentHash": "lJ47Cps5Qzr86N99lcwd+OUvQma7+fBgr8+Mn+aOC0WrlqMNkdivaYD9IvnZ5Mqo6Ky3LS7ZI+tUq1/s9ERd0Q==",
+        "requested": "[6.0.0, )",
+        "resolved": "6.0.0",
+        "contentHash": "0gvKMbiJ+/WrfbcfBfqRZZrvfLJcd3rqkqVMjjlY5dtmLRVzMY+o/K/rJUStofQ2haSr9Vd04YDfvZtVVGS3/A==",
         "dependencies": {
           "Castle.Core": "5.1.1"
         }
diff --git a/tests/AndreGoepel.AppFoundation.Tests/packages.lock.json b/tests/AndreGoepel.AppFoundation.Tests/packages.lock.json
index fe55e19..e349fe1 100644
--- a/tests/AndreGoepel.AppFoundation.Tests/packages.lock.json
+++ b/tests/AndreGoepel.AppFoundation.Tests/packages.lock.json
@@ -45,9 +45,9 @@
       },
       "NSubstitute": {
         "type": "Direct",
-        "requested": "[5.3.0, )",
-        "resolved": "5.3.0",
-        "contentHash": "lJ47Cps5Qzr86N99lcwd+OUvQma7+fBgr8+Mn+aOC0WrlqMNkdivaYD9IvnZ5Mqo6Ky3LS7ZI+tUq1/s9ERd0Q==",
+        "requested": "[6.0.0, )",
+        "resolved": "6.0.0",
+        "contentHash": "0gvKMbiJ+/WrfbcfBfqRZZrvfLJcd3rqkqVMjjlY5dtmLRVzMY+o/K/rJUStofQ2haSr9Vd04YDfvZtVVGS3/A==",
         "dependencies": {
           "Castle.Core": "5.1.1"
         }