diff --git a/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj b/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj
index 18993a93e00..d58f0468244 100755
--- a/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj
+++ b/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj
@@ -17,8 +17,8 @@
 
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="9.0.1" />
-    <PackageReference Include="NUnit" Version="3.6.0" />
-    <PackageReference Include="NUnitLite" Version="3.6.0" />
+    <PackageReference Include="NUnit" Version="3.10.1" />
+    <PackageReference Include="NUnitLite" Version="3.10.1" />
     <PackageReference Include="OpenCover" Version="4.6.519" />
     <PackageReference Include="ReportGenerator" Version="2.4.4.0" />
   </ItemGroup>
diff --git a/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj b/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj
index d2cc5bbc65e..7493eb8051d 100755
--- a/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj
+++ b/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj
@@ -17,8 +17,8 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="NUnit" Version="3.6.0" />
-    <PackageReference Include="NUnitLite" Version="3.6.0" />
+    <PackageReference Include="NUnit" Version="3.10.1" />
+    <PackageReference Include="NUnitLite" Version="3.10.1" />
     <PackageReference Include="Moq" Version="4.8.2" />
   </ItemGroup>
 
diff --git a/src/csharp/Grpc.HealthCheck.Tests/Grpc.HealthCheck.Tests.csproj b/src/csharp/Grpc.HealthCheck.Tests/Grpc.HealthCheck.Tests.csproj
index 9da0539dcb9..616e56df105 100755
--- a/src/csharp/Grpc.HealthCheck.Tests/Grpc.HealthCheck.Tests.csproj
+++ b/src/csharp/Grpc.HealthCheck.Tests/Grpc.HealthCheck.Tests.csproj
@@ -16,8 +16,8 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="NUnit" Version="3.6.0" />
-    <PackageReference Include="NUnitLite" Version="3.6.0" />
+    <PackageReference Include="NUnit" Version="3.10.1" />
+    <PackageReference Include="NUnitLite" Version="3.10.1" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">
diff --git a/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj b/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj
index e4f36d8810d..ad7033b7829 100755
--- a/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj
+++ b/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj
@@ -19,8 +19,8 @@
   <ItemGroup>
     <PackageReference Include="Google.Protobuf" Version="$(GoogleProtobufVersion)" />
     <PackageReference Include="CommandLineParser" Version="2.1.1-beta" />
-    <PackageReference Include="NUnit" Version="3.6.0" />
-    <PackageReference Include="NUnitLite" Version="3.6.0" />
+    <PackageReference Include="NUnit" Version="3.10.1" />
+    <PackageReference Include="NUnitLite" Version="3.10.1" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">
diff --git a/src/csharp/Grpc.Reflection.Tests/Grpc.Reflection.Tests.csproj b/src/csharp/Grpc.Reflection.Tests/Grpc.Reflection.Tests.csproj
index d3686971245..0c12f38f25a 100755
--- a/src/csharp/Grpc.Reflection.Tests/Grpc.Reflection.Tests.csproj
+++ b/src/csharp/Grpc.Reflection.Tests/Grpc.Reflection.Tests.csproj
@@ -16,8 +16,8 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="NUnit" Version="3.6.0" />
-    <PackageReference Include="NUnitLite" Version="3.6.0" />
+    <PackageReference Include="NUnit" Version="3.10.1" />
+    <PackageReference Include="NUnitLite" Version="3.10.1" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">
diff --git a/src/csharp/Grpc.Tools.Tests/Grpc.Tools.Tests.csproj b/src/csharp/Grpc.Tools.Tests/Grpc.Tools.Tests.csproj
index 7c1a6afe343..ab14f32afd4 100644
--- a/src/csharp/Grpc.Tools.Tests/Grpc.Tools.Tests.csproj
+++ b/src/csharp/Grpc.Tools.Tests/Grpc.Tools.Tests.csproj
@@ -27,7 +27,8 @@
 
   <ItemGroup>
     <PackageReference Include="Moq" Version="4.8.3" />
-    <PackageReference Include="NUnit; NUnitLite" Version="3.10.1" />
+    <PackageReference Include="NUnit" Version="3.10.1" />
+    <PackageReference Include="NUnitLite" Version="3.10.1" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp1.0' ">