diff --git a/test/Directory.Build.props b/test/Directory.Build.props
index 0d5e70a..3d6053b 100644
--- a/test/Directory.Build.props
+++ b/test/Directory.Build.props
@@ -7,12 +7,12 @@
 
   <!-- These packages must have matching versions. Do not believe Dependabot when it tries to update them individually -->
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
-    <PackageReference Include="Microsoft.CodeCoverage" Version="17.7.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
+    <PackageReference Include="Microsoft.CodeCoverage" Version="17.9.0" />
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="coverlet.collector" Version="6.0.0">
+    <PackageReference Include="coverlet.collector" Version="6.0.1">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
diff --git a/test/idunno.Authentication.Certificate.Test/TestCertificates/selfSignedNoEkuCertificateExpired.cer b/test/idunno.Authentication.Certificate.Test/TestCertificates/selfSignedNoEkuCertificateExpired.cer
index a91c80f..03efbe2 100644
Binary files a/test/idunno.Authentication.Certificate.Test/TestCertificates/selfSignedNoEkuCertificateExpired.cer and b/test/idunno.Authentication.Certificate.Test/TestCertificates/selfSignedNoEkuCertificateExpired.cer differ
diff --git a/test/idunno.Authentication.Certificate.Test/TestCertificates/selfSignedNoEkuCertificateNotValidYet.cer b/test/idunno.Authentication.Certificate.Test/TestCertificates/selfSignedNoEkuCertificateNotValidYet.cer
index 7d4eb51..d3e75b7 100644
Binary files a/test/idunno.Authentication.Certificate.Test/TestCertificates/selfSignedNoEkuCertificateNotValidYet.cer and b/test/idunno.Authentication.Certificate.Test/TestCertificates/selfSignedNoEkuCertificateNotValidYet.cer differ
diff --git a/test/idunno.Authentication.Certificate.Test/TestCertificates/validSelfSignedClientEkuCertificate.cer b/test/idunno.Authentication.Certificate.Test/TestCertificates/validSelfSignedClientEkuCertificate.cer
index ae7af17..b5a80e2 100644
Binary files a/test/idunno.Authentication.Certificate.Test/TestCertificates/validSelfSignedClientEkuCertificate.cer and b/test/idunno.Authentication.Certificate.Test/TestCertificates/validSelfSignedClientEkuCertificate.cer differ
diff --git a/test/idunno.Authentication.Certificate.Test/TestCertificates/validSelfSignedNoEkuCertificate.cer b/test/idunno.Authentication.Certificate.Test/TestCertificates/validSelfSignedNoEkuCertificate.cer
index cab0cb6..a176c2a 100644
Binary files a/test/idunno.Authentication.Certificate.Test/TestCertificates/validSelfSignedNoEkuCertificate.cer and b/test/idunno.Authentication.Certificate.Test/TestCertificates/validSelfSignedNoEkuCertificate.cer differ
diff --git a/test/idunno.Authentication.Certificate.Test/TestCertificates/validSelfSignedServerEkuCertificate.cer b/test/idunno.Authentication.Certificate.Test/TestCertificates/validSelfSignedServerEkuCertificate.cer
index 9407eaf..86a5b73 100644
Binary files a/test/idunno.Authentication.Certificate.Test/TestCertificates/validSelfSignedServerEkuCertificate.cer and b/test/idunno.Authentication.Certificate.Test/TestCertificates/validSelfSignedServerEkuCertificate.cer differ
diff --git a/test/idunno.Authentication.Certificate.Test/idunno.Authentication.Certificate.Test.csproj b/test/idunno.Authentication.Certificate.Test/idunno.Authentication.Certificate.Test.csproj
index 2a88c2f..8295bb1 100644
--- a/test/idunno.Authentication.Certificate.Test/idunno.Authentication.Certificate.Test.csproj
+++ b/test/idunno.Authentication.Certificate.Test/idunno.Authentication.Certificate.Test.csproj
@@ -19,7 +19,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.TestHost" Version="3.1.32" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.6">
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       </PackageReference>