diff --git a/tests/SimpleAccounting.IntegrationTests/SimpleAccounting.IntegrationTests.csproj b/tests/SimpleAccounting.IntegrationTests/SimpleAccounting.IntegrationTests.csproj
index 27a9827..6d8791f 100644
--- a/tests/SimpleAccounting.IntegrationTests/SimpleAccounting.IntegrationTests.csproj
+++ b/tests/SimpleAccounting.IntegrationTests/SimpleAccounting.IntegrationTests.csproj
@@ -11,7 +11,7 @@
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     <!-- license is BSD-3-Clause -->
-    <PackageReference Include="NSubstitute" Version="5.3.0"/>
+    <PackageReference Include="NSubstitute" Version="6.0.0"/>
     <!-- license is apache 2.0 -->
     <PackageReference Include="xunit.v3" Version="3.2.2"/>
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">