diff --git a/Source/Cake.Coveralls.Tests/Cake.Coveralls.Tests.csproj b/Source/Cake.Coveralls.Tests/Cake.Coveralls.Tests.csproj
index 2fa79f6..0421ce9 100644
--- a/Source/Cake.Coveralls.Tests/Cake.Coveralls.Tests.csproj
+++ b/Source/Cake.Coveralls.Tests/Cake.Coveralls.Tests.csproj
@@ -21,7 +21,7 @@
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+    <PackageReference Include="NSubstitute" Version="5.3.0" />
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     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
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