diff --git a/tests/Tests.csproj b/tests/Tests.csproj
index 0209b67b..61901da8 100644
--- a/tests/Tests.csproj
+++ b/tests/Tests.csproj
@@ -24,7 +24,7 @@
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     <PackageReference Include="NuGet.ProjectModel" Version="6.0.0-preview.1.107" />
     <PackageReference Include="nunit" Version="3.13.2" />
-    <PackageReference Include="NUnit3TestAdapter" Version="3.17.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.0" />
     <PackageReference Include="McMaster.NETCore.Plugins" Version="1.4.0" />
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diff --git a/tests/packages.lock.json b/tests/packages.lock.json
index f20e4d36..f73eb3d2 100644
--- a/tests/packages.lock.json
+++ b/tests/packages.lock.json
@@ -154,20 +154,9 @@
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+        "requested": "[4.0.0, )",
+        "resolved": "4.0.0",
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@@ -394,21 +383,6 @@
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@@ -708,16 +682,6 @@
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@@ -856,14 +820,6 @@
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@@ -919,17 +875,6 @@
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@@ -1078,34 +1023,6 @@
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@@ -1421,20 +1338,6 @@
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@@ -1563,19 +1466,10 @@
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@@ -1644,39 +1538,6 @@
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