diff --git a/Directory.Packages.props b/Directory.Packages.props
index 2595dab..fff8dca 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -5,7 +5,7 @@
   </PropertyGroup>
   <!-- Test package versions (referenced from test projects under tests/). -->
   <ItemGroup>
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.8.1" />
     <PackageVersion Include="xunit" Version="2.9.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageVersion Include="coverlet.collector" Version="10.0.1" />
diff --git a/tests/library.Tests/packages.lock.json b/tests/library.Tests/packages.lock.json
index c8ad699..5f9eb26 100644
--- a/tests/library.Tests/packages.lock.json
+++ b/tests/library.Tests/packages.lock.json
@@ -22,12 +22,12 @@
       },
       "Microsoft.NET.Test.Sdk": {
         "type": "Direct",
-        "requested": "[18.7.0, )",
-        "resolved": "18.7.0",
-        "contentHash": "49xH9j4UzCh2hMohJp53g3wUTvyycECw7CtVht4gfCz5ykudB1uBcF6D0TtgJPjCtP76UPW53bQElKdCeX+dUg==",
+        "requested": "[18.8.1, )",
+        "resolved": "18.8.1",
+        "contentHash": "dknJL3/9Y3t4XuCBqnc0PevPxgLsUMmVhjwup/b1HNovA8zWcj3XsfIf7c6p05363DWcqL7X/YhDL9B+Zymv1w==",
         "dependencies": {
-          "Microsoft.CodeCoverage": "18.7.0",
-          "Microsoft.TestPlatform.TestHost": "18.7.0"
+          "Microsoft.CodeCoverage": "18.8.1",
+          "Microsoft.TestPlatform.TestHost": "18.8.1"
         }
       },
       "Microsoft.VisualStudio.Threading.Analyzers": {
@@ -67,28 +67,22 @@
       },
       "Microsoft.CodeCoverage": {
         "type": "Transitive",
-        "resolved": "18.7.0",
-        "contentHash": "+wFfx9s7D9wegM0RziXMj2kvYDT4qcqXXtyjiQwSZOGQ2wwcOAJQcD6eQXk02jt0MvRNawtp8TJxTrV+wD8X1g=="
+        "resolved": "18.8.1",
+        "contentHash": "Eclse/ZZjr4lmWzZFNN9h/OluhKL+SK/QbUyKUewgX139aGeyMEO/DkMPwuFs2MixvanTnz6891rF8UHDg+W4Q=="
       },
       "Microsoft.TestPlatform.ObjectModel": {
         "type": "Transitive",
-        "resolved": "18.7.0",
-        "contentHash": "6rmgU4q3/WOpOPcncI0YW0Q/QpcQtwR2TTEXDR5+4TfSimPBAk6Z/BgKLeGgp1SOun0ROVUCCafXhRLwsHaPpA=="
+        "resolved": "18.8.1",
+        "contentHash": "qLbktNB1+b1XZLNJBTzaWVVJAd6PEzD7cgD406geMb6PcFZhp3EDNa1tctWx1+mtMU6MP/6ozVvFPC9vs2a9rw=="
       },
       "Microsoft.TestPlatform.TestHost": {
         "type": "Transitive",
-        "resolved": "18.7.0",
-        "contentHash": "kYwfmebCs8992zaxEDkvG7S+YEouTeKfYVKUFEkwh1W2dIoOaevBt80XSKVXCUFEhusjOIm1sFfHBnoJgygrRA==",
+        "resolved": "18.8.1",
+        "contentHash": "FaQHPDTUOcE+SFTjssNPfrub2lT9Zyon4J2W/KLHt/efLJACb1TCeWXyOgh0D/4Q1e4n+S3E6mOKud+9nLZlEA==",
         "dependencies": {
-          "Microsoft.TestPlatform.ObjectModel": "18.7.0",
-          "Newtonsoft.Json": "13.0.3"
+          "Microsoft.TestPlatform.ObjectModel": "18.8.1"
         }
       },
-      "Newtonsoft.Json": {
-        "type": "Transitive",
-        "resolved": "13.0.3",
-        "contentHash": "HrC5BXdl00IP9zeV+0Z848QWPAoCr9P3bDEZguI+gkLcBKAOxix/tLEAAHC+UvDNPv4a2d18lOReHMOagPa+zQ=="
-      },
       "xunit.abstractions": {
         "type": "Transitive",
         "resolved": "2.0.3",
@@ -134,4 +128,4 @@
       }
     }
   }
-}
+}
\ No newline at end of file