diff --git a/tests/DendroDocs.Tool.Tests/DendroDocs.Tool.Tests.csproj b/tests/DendroDocs.Tool.Tests/DendroDocs.Tool.Tests.csproj
index 27876c3..fa108e1 100644
--- a/tests/DendroDocs.Tool.Tests/DendroDocs.Tool.Tests.csproj
+++ b/tests/DendroDocs.Tool.Tests/DendroDocs.Tool.Tests.csproj
@@ -5,6 +5,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <LangVersion>latest</LangVersion>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
 
     <IsPackable>false</IsPackable>
     <!--