diff --git a/tests/ParserTests/ParserTests.csproj b/tests/ParserTests/ParserTests.csproj
index 66824171..69905ea1 100644
--- a/tests/ParserTests/ParserTests.csproj
+++ b/tests/ParserTests/ParserTests.csproj
@@ -10,7 +10,7 @@
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+    <PackageReference Include="xunit" Version="2.9.1" />
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