diff --git a/src/Atrea.Extensions.Tests/Atrea.Extensions.Tests.csproj b/src/Atrea.Extensions.Tests/Atrea.Extensions.Tests.csproj
index 173374b..e83ce0b 100644
--- a/src/Atrea.Extensions.Tests/Atrea.Extensions.Tests.csproj
+++ b/src/Atrea.Extensions.Tests/Atrea.Extensions.Tests.csproj
@@ -11,13 +11,13 @@
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-    <PackageReference Include="NUnit" Version="3.13.3" />
+    <PackageReference Include="NUnit" Version="4.0.1" />
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