diff --git a/csharp/tests/Base64EncoderTests/Base64EncoderTests.csproj b/csharp/tests/Base64EncoderTests/Base64EncoderTests.csproj
index e7f793d..4e6ed82 100644
--- a/csharp/tests/Base64EncoderTests/Base64EncoderTests.csproj
+++ b/csharp/tests/Base64EncoderTests/Base64EncoderTests.csproj
@@ -8,7 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.4.3" />
     <PackageReference Include="MSTest.TestFramework" Version="3.4.3" />
     <PackageReference Include="coverlet.collector" Version="6.0.2" />
   </ItemGroup>
diff --git a/csharp/tests/HKDFTests/HKDFTests.csproj b/csharp/tests/HKDFTests/HKDFTests.csproj
index 74f817c..d352306 100644
--- a/csharp/tests/HKDFTests/HKDFTests.csproj
+++ b/csharp/tests/HKDFTests/HKDFTests.csproj
@@ -8,7 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.4.3" />
     <PackageReference Include="MSTest.TestFramework" Version="3.4.3" />
     <PackageReference Include="coverlet.collector" Version="6.0.2" />
   </ItemGroup>
diff --git a/csharp/tests/HMACTests/HMACTests.csproj b/csharp/tests/HMACTests/HMACTests.csproj
index 5fb05d0..795c91d 100644
--- a/csharp/tests/HMACTests/HMACTests.csproj
+++ b/csharp/tests/HMACTests/HMACTests.csproj
@@ -8,7 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.4.3" />
     <PackageReference Include="MSTest.TestFramework" Version="3.4.3" />
     <PackageReference Include="coverlet.collector" Version="3.2.0" />
   </ItemGroup>