diff --git a/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/net462/PublicAPI.Shipped.txt b/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/net462/PublicAPI.Shipped.txt
index e69de29bb2..7dc5c58110 100644
--- a/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/net462/PublicAPI.Shipped.txt
+++ b/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/net462/PublicAPI.Shipped.txt
@@ -0,0 +1 @@
+#nullable enable
diff --git a/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/net462/PublicAPI.Unshipped.txt b/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/net462/PublicAPI.Unshipped.txt
index 1fd1f60339..f09de33268 100644
--- a/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/net462/PublicAPI.Unshipped.txt
+++ b/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/net462/PublicAPI.Unshipped.txt
@@ -2,22 +2,22 @@ OpenTelemetry.Exporter.Stackdriver.Implementation.GoogleCloudResourceUtils
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.ExportInterval.get -> System.TimeSpan
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.ExportInterval.set -> void
-OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.GoogleCredential.get -> Google.Apis.Auth.OAuth2.GoogleCredential
+OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.GoogleCredential.get -> Google.Apis.Auth.OAuth2.GoogleCredential?
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.GoogleCredential.set -> void
-OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.MetricNamePrefix.get -> string
+OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.MetricNamePrefix.get -> string?
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.MetricNamePrefix.set -> void
-OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.MonitoredResource.get -> Google.Api.MonitoredResource
+OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.MonitoredResource.get -> Google.Api.MonitoredResource?
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.MonitoredResource.set -> void
-OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.ProjectId.get -> string
+OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.ProjectId.get -> string?
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.ProjectId.set -> void
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.StackdriverStatsConfiguration() -> void
 OpenTelemetry.Exporter.Stackdriver.StackdriverTraceExporter
-OpenTelemetry.Exporter.Stackdriver.StackdriverTraceExporter.StackdriverTraceExporter(string projectId) -> void
+OpenTelemetry.Exporter.Stackdriver.StackdriverTraceExporter.StackdriverTraceExporter(string! projectId) -> void
 OpenTelemetry.Exporter.Stackdriver.Utils.CommonUtils
 OpenTelemetry.Trace.TracerProviderBuilderExtensions
-override OpenTelemetry.Exporter.Stackdriver.StackdriverTraceExporter.Export(in OpenTelemetry.Batch<System.Diagnostics.Activity> batch) -> OpenTelemetry.ExportResult
-static OpenTelemetry.Exporter.Stackdriver.Implementation.GoogleCloudResourceUtils.GetDefaultResource(string projectId) -> Google.Api.MonitoredResource
-static OpenTelemetry.Exporter.Stackdriver.Implementation.GoogleCloudResourceUtils.GetProjectId() -> string
-static OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.Default.get -> OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration
-static OpenTelemetry.Exporter.Stackdriver.Utils.CommonUtils.Partition<T>(this System.Collections.Generic.IEnumerable<T> source, int size) -> System.Collections.Generic.IEnumerable<System.Collections.Generic.IEnumerable<T>>
-static OpenTelemetry.Trace.TracerProviderBuilderExtensions.UseStackdriverExporter(this OpenTelemetry.Trace.TracerProviderBuilder builder, string projectId) -> OpenTelemetry.Trace.TracerProviderBuilder
\ No newline at end of file
+override OpenTelemetry.Exporter.Stackdriver.StackdriverTraceExporter.Export(in OpenTelemetry.Batch<System.Diagnostics.Activity!> batch) -> OpenTelemetry.ExportResult
+static OpenTelemetry.Exporter.Stackdriver.Implementation.GoogleCloudResourceUtils.GetDefaultResource(string? projectId) -> Google.Api.MonitoredResource!
+static OpenTelemetry.Exporter.Stackdriver.Implementation.GoogleCloudResourceUtils.GetProjectId() -> string?
+static OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.Default.get -> OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration!
+static OpenTelemetry.Exporter.Stackdriver.Utils.CommonUtils.Partition<T>(this System.Collections.Generic.IEnumerable<T>! source, int size) -> System.Collections.Generic.IEnumerable<System.Collections.Generic.IEnumerable<T>!>!
+static OpenTelemetry.Trace.TracerProviderBuilderExtensions.UseStackdriverExporter(this OpenTelemetry.Trace.TracerProviderBuilder! builder, string! projectId) -> OpenTelemetry.Trace.TracerProviderBuilder!
diff --git a/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/netstandard2.0/PublicAPI.Shipped.txt b/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/netstandard2.0/PublicAPI.Shipped.txt
index e69de29bb2..7dc5c58110 100644
--- a/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/netstandard2.0/PublicAPI.Shipped.txt
+++ b/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/netstandard2.0/PublicAPI.Shipped.txt
@@ -0,0 +1 @@
+#nullable enable
diff --git a/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/netstandard2.0/PublicAPI.Unshipped.txt b/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/netstandard2.0/PublicAPI.Unshipped.txt
index 1fd1f60339..f09de33268 100644
--- a/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/netstandard2.0/PublicAPI.Unshipped.txt
+++ b/src/OpenTelemetry.Exporter.Stackdriver/.publicApi/netstandard2.0/PublicAPI.Unshipped.txt
@@ -2,22 +2,22 @@ OpenTelemetry.Exporter.Stackdriver.Implementation.GoogleCloudResourceUtils
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.ExportInterval.get -> System.TimeSpan
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.ExportInterval.set -> void
-OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.GoogleCredential.get -> Google.Apis.Auth.OAuth2.GoogleCredential
+OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.GoogleCredential.get -> Google.Apis.Auth.OAuth2.GoogleCredential?
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.GoogleCredential.set -> void
-OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.MetricNamePrefix.get -> string
+OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.MetricNamePrefix.get -> string?
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.MetricNamePrefix.set -> void
-OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.MonitoredResource.get -> Google.Api.MonitoredResource
+OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.MonitoredResource.get -> Google.Api.MonitoredResource?
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.MonitoredResource.set -> void
-OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.ProjectId.get -> string
+OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.ProjectId.get -> string?
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.ProjectId.set -> void
 OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.StackdriverStatsConfiguration() -> void
 OpenTelemetry.Exporter.Stackdriver.StackdriverTraceExporter
-OpenTelemetry.Exporter.Stackdriver.StackdriverTraceExporter.StackdriverTraceExporter(string projectId) -> void
+OpenTelemetry.Exporter.Stackdriver.StackdriverTraceExporter.StackdriverTraceExporter(string! projectId) -> void
 OpenTelemetry.Exporter.Stackdriver.Utils.CommonUtils
 OpenTelemetry.Trace.TracerProviderBuilderExtensions
-override OpenTelemetry.Exporter.Stackdriver.StackdriverTraceExporter.Export(in OpenTelemetry.Batch<System.Diagnostics.Activity> batch) -> OpenTelemetry.ExportResult
-static OpenTelemetry.Exporter.Stackdriver.Implementation.GoogleCloudResourceUtils.GetDefaultResource(string projectId) -> Google.Api.MonitoredResource
-static OpenTelemetry.Exporter.Stackdriver.Implementation.GoogleCloudResourceUtils.GetProjectId() -> string
-static OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.Default.get -> OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration
-static OpenTelemetry.Exporter.Stackdriver.Utils.CommonUtils.Partition<T>(this System.Collections.Generic.IEnumerable<T> source, int size) -> System.Collections.Generic.IEnumerable<System.Collections.Generic.IEnumerable<T>>
-static OpenTelemetry.Trace.TracerProviderBuilderExtensions.UseStackdriverExporter(this OpenTelemetry.Trace.TracerProviderBuilder builder, string projectId) -> OpenTelemetry.Trace.TracerProviderBuilder
\ No newline at end of file
+override OpenTelemetry.Exporter.Stackdriver.StackdriverTraceExporter.Export(in OpenTelemetry.Batch<System.Diagnostics.Activity!> batch) -> OpenTelemetry.ExportResult
+static OpenTelemetry.Exporter.Stackdriver.Implementation.GoogleCloudResourceUtils.GetDefaultResource(string? projectId) -> Google.Api.MonitoredResource!
+static OpenTelemetry.Exporter.Stackdriver.Implementation.GoogleCloudResourceUtils.GetProjectId() -> string?
+static OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration.Default.get -> OpenTelemetry.Exporter.Stackdriver.Implementation.StackdriverStatsConfiguration!
+static OpenTelemetry.Exporter.Stackdriver.Utils.CommonUtils.Partition<T>(this System.Collections.Generic.IEnumerable<T>! source, int size) -> System.Collections.Generic.IEnumerable<System.Collections.Generic.IEnumerable<T>!>!
+static OpenTelemetry.Trace.TracerProviderBuilderExtensions.UseStackdriverExporter(this OpenTelemetry.Trace.TracerProviderBuilder! builder, string! projectId) -> OpenTelemetry.Trace.TracerProviderBuilder!
diff --git a/src/OpenTelemetry.Exporter.Stackdriver/Implementation/ActivityExtensions.cs b/src/OpenTelemetry.Exporter.Stackdriver/Implementation/ActivityExtensions.cs
index 240c2af077..36aa1f032f 100644
--- a/src/OpenTelemetry.Exporter.Stackdriver/Implementation/ActivityExtensions.cs
+++ b/src/OpenTelemetry.Exporter.Stackdriver/Implementation/ActivityExtensions.cs
@@ -14,8 +14,6 @@
 // limitations under the License.
 // </copyright>
 
-#nullable enable
-
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Globalization;
@@ -136,25 +134,25 @@ public static AttributeValue ToAttributeValue(this object? av)
         switch (av)
         {
             case string s:
-                return new AttributeValue()
+                return new AttributeValue
                 {
-                    StringValue = new TruncatableString() { Value = s },
+                    StringValue = new TruncatableString { Value = s },
                 };
             case bool b:
-                return new AttributeValue() { BoolValue = b };
+                return new AttributeValue { BoolValue = b };
             case long l:
-                return new AttributeValue() { IntValue = l };
+                return new AttributeValue { IntValue = l };
             case double d:
-                return new AttributeValue()
+                return new AttributeValue
                 {
-                    StringValue = new TruncatableString() { Value = d.ToString(CultureInfo.InvariantCulture) },
+                    StringValue = new TruncatableString { Value = d.ToString(CultureInfo.InvariantCulture) },
                 };
             case null:
                 return new AttributeValue();
             default:
-                return new AttributeValue()
+                return new AttributeValue
                 {
-                    StringValue = new TruncatableString() { Value = av.ToString() },
+                    StringValue = new TruncatableString { Value = av.ToString() },
                 };
         }
     }
diff --git a/src/OpenTelemetry.Exporter.Stackdriver/Implementation/Constants.cs b/src/OpenTelemetry.Exporter.Stackdriver/Implementation/Constants.cs
index 800a31aa74..ee3797181e 100644
--- a/src/OpenTelemetry.Exporter.Stackdriver/Implementation/Constants.cs
+++ b/src/OpenTelemetry.Exporter.Stackdriver/Implementation/Constants.cs
@@ -14,41 +14,13 @@
 // limitations under the License.
 // </copyright>
 
-using System;
-
 namespace OpenTelemetry.Exporter.Stackdriver.Implementation;
 
 internal class Constants
 {
     public const string PackagVersionUndefined = "undefined";
 
-    public const string LabelDescription = "OpenTelemetry string";
-    public const string OpenTelemetryTask = "OpenTelemetry_task";
-    public const string OpenTelemetryTaskDescription = "OpenTelemetry task identifier";
-
-    public const string GcpGkeContainer = "k8s_container";
-    public const string GcpGceInstance = "gce_instance";
-    public const string AwsEc2Instance = "aws_ec2_instance";
     public const string Global = "global";
 
     public const string ProjectIdLabelKey = "project_id";
-
-    public const string GceGcpInstanceType = "cloud.google.com/gce/instance";
-    public const string GcpInstanceIdKey = "cloud.google.com/gce/instance_id";
-    public const string GcpAccountIdKey = "cloud.google.com/gce/project_id";
-    public const string GcpZoneKey = "cloud.google.com/gce/zone";
-
-    public const string K8sContainerType = "k8s.io/container";
-    public const string K8sClusterNameKey = "k8s.io/cluster/name";
-    public const string K8sContainerNameKey = "k8s.io/container/name";
-    public const string K8sNamespaceNameKey = "k8s.io/namespace/name";
-    public const string K8sPodNameKey = "k8s.io/pod/name";
-
-    public static readonly string OpenTelemetryTaskValueDefault = GenerateDefaultTaskValue();
-
-    private static string GenerateDefaultTaskValue()
-    {
-        // Something like '<pid>@<hostname>'
-        return $"dotnet-{System.Diagnostics.Process.GetCurrentProcess().Id}@{Environment.MachineName}";
-    }
 }
diff --git a/src/OpenTelemetry.Exporter.Stackdriver/Implementation/ExporterStackdriverEventSource.cs b/src/OpenTelemetry.Exporter.Stackdriver/Implementation/ExporterStackdriverEventSource.cs
index 118f88aac5..818383e680 100644
--- a/src/OpenTelemetry.Exporter.Stackdriver/Implementation/ExporterStackdriverEventSource.cs
+++ b/src/OpenTelemetry.Exporter.Stackdriver/Implementation/ExporterStackdriverEventSource.cs
@@ -23,7 +23,7 @@ namespace OpenTelemetry.Exporter.Stackdriver.Implementation;
 [EventSource(Name = "OpenTelemetry-Exporter-Stackdriver")]
 internal class ExporterStackdriverEventSource : EventSource
 {
-    public static readonly ExporterStackdriverEventSource Log = new ExporterStackdriverEventSource();
+    public static readonly ExporterStackdriverEventSource Log = new();
 
     [NonEvent]
     public void ExportMethodException(Exception ex)
diff --git a/src/OpenTelemetry.Exporter.Stackdriver/Implementation/GoogleCloudResourceUtils.cs b/src/OpenTelemetry.Exporter.Stackdriver/Implementation/GoogleCloudResourceUtils.cs
index 8f924ccf0e..2dfb3e0270 100644
--- a/src/OpenTelemetry.Exporter.Stackdriver/Implementation/GoogleCloudResourceUtils.cs
+++ b/src/OpenTelemetry.Exporter.Stackdriver/Implementation/GoogleCloudResourceUtils.cs
@@ -32,7 +32,7 @@ public static class GoogleCloudResourceUtils
     /// the method returns null.
     /// </summary>
     /// <returns>Google Cloud Project ID.</returns>
-    public static string GetProjectId()
+    public static string? GetProjectId()
     {
         // Try to detect projectId from the environment where the code is running
         var instance = Google.Api.Gax.Platform.Instance();
@@ -60,7 +60,7 @@ public static string GetProjectId()
     /// </summary>
     /// <param name="projectId">The project id.</param>
     /// <returns>Stackdriver Monitored Resource.</returns>
-    public static MonitoredResource GetDefaultResource(string projectId)
+    public static MonitoredResource GetDefaultResource(string? projectId)
     {
         var resource = new MonitoredResource();
         resource.Type = Constants.Global;
diff --git a/src/OpenTelemetry.Exporter.Stackdriver/Implementation/StackdriverStatsConfiguration.cs b/src/OpenTelemetry.Exporter.Stackdriver/Implementation/StackdriverStatsConfiguration.cs
index 2ebe727993..8d436432a5 100644
--- a/src/OpenTelemetry.Exporter.Stackdriver/Implementation/StackdriverStatsConfiguration.cs
+++ b/src/OpenTelemetry.Exporter.Stackdriver/Implementation/StackdriverStatsConfiguration.cs
@@ -54,17 +54,17 @@ public static StackdriverStatsConfiguration Default
     /// <summary>
     /// Gets or sets the prefix to append to every OpenTelemetry metric name in Stackdriver.
     /// </summary>
-    public string MetricNamePrefix { get; set; }
+    public string? MetricNamePrefix { get; set; }
 
     /// <summary>
     /// Gets or sets google Cloud Project Id.
     /// </summary>
-    public string ProjectId { get; set; }
+    public string? ProjectId { get; set; }
 
     /// <summary>
     /// Gets or sets credential used to authenticate against Google Stackdriver Monitoring APIs.
     /// </summary>
-    public GoogleCredential GoogleCredential { get; set; }
+    public GoogleCredential? GoogleCredential { get; set; }
 
     /// <summary>
     /// Gets or sets monitored Resource associated with metrics collection.
@@ -72,5 +72,5 @@ public static StackdriverStatsConfiguration Default
     /// such as GKE/AWS/GCE. If the exporter is running on a different environment,
     /// monitored resource will be identified as "general".
     /// </summary>
-    public MonitoredResource MonitoredResource { get; set; }
+    public MonitoredResource? MonitoredResource { get; set; }
 }
diff --git a/src/OpenTelemetry.Exporter.Stackdriver/OpenTelemetry.Exporter.Stackdriver.csproj b/src/OpenTelemetry.Exporter.Stackdriver/OpenTelemetry.Exporter.Stackdriver.csproj
index 025d4ddd29..515cde9d2a 100644
--- a/src/OpenTelemetry.Exporter.Stackdriver/OpenTelemetry.Exporter.Stackdriver.csproj
+++ b/src/OpenTelemetry.Exporter.Stackdriver/OpenTelemetry.Exporter.Stackdriver.csproj
@@ -6,6 +6,7 @@
     <PackageTags>$(PackageTags);Stackdriver;Google;GCP;distributed-tracing</PackageTags>
     <MinVerTagPrefix>Exporter.Stackdriver-</MinVerTagPrefix>
     <IncludeSharedExceptionExtensionsSource>true</IncludeSharedExceptionExtensionsSource>
+    <Nullable>enable</Nullable>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Google.Cloud.Monitoring.V3" Version="[2.6.0,4.0)" />
diff --git a/src/OpenTelemetry.Exporter.Stackdriver/README.md b/src/OpenTelemetry.Exporter.Stackdriver/README.md
index 911543af79..4f26b1e07a 100644
--- a/src/OpenTelemetry.Exporter.Stackdriver/README.md
+++ b/src/OpenTelemetry.Exporter.Stackdriver/README.md
@@ -22,7 +22,7 @@ constructor for specifying path to the service account credential.
 ## Installation
 
 ```shell
-dotnet add package OpenTelemetry.Contrib.Instrumentation.Stackdriver
+dotnet add package OpenTelemetry.Contrib.Instrumentation.Stackdriver --prerelease
 ```
 
 ## Traces
diff --git a/src/OpenTelemetry.Exporter.Stackdriver/StackdriverTraceExporter.cs b/src/OpenTelemetry.Exporter.Stackdriver/StackdriverTraceExporter.cs
index e109388329..22d3b57418 100644
--- a/src/OpenTelemetry.Exporter.Stackdriver/StackdriverTraceExporter.cs
+++ b/src/OpenTelemetry.Exporter.Stackdriver/StackdriverTraceExporter.cs
@@ -35,7 +35,7 @@ public class StackdriverTraceExporter : BaseExporter<Activity>
 
     private readonly Google.Api.Gax.ResourceNames.ProjectName googleCloudProjectId;
     private readonly TraceServiceSettings traceServiceSettings;
-    private readonly TraceServiceClient traceServiceClient;
+    private readonly TraceServiceClient? traceServiceClient;
 
 #pragma warning disable CA1810 // Initialize reference type static fields inline
     static StackdriverTraceExporter()
@@ -91,8 +91,8 @@ internal StackdriverTraceExporter(string projectId, TraceServiceClient traceServ
     /// <inheritdoc/>
     public override ExportResult Export(in Batch<Activity> batch)
     {
-        TraceServiceClient traceWriter = this.traceServiceClient;
-        if (this.traceServiceClient == null)
+        TraceServiceClient? traceWriter = this.traceServiceClient;
+        if (traceWriter == null)
         {
             traceWriter = new TraceServiceClientBuilder
             {
diff --git a/test/OpenTelemetry.Exporter.Stackdriver.Tests/OpenTelemetry.Exporter.Stackdriver.Tests.csproj b/test/OpenTelemetry.Exporter.Stackdriver.Tests/OpenTelemetry.Exporter.Stackdriver.Tests.csproj
index 52327d652c..bb8e66d5b6 100644
--- a/test/OpenTelemetry.Exporter.Stackdriver.Tests/OpenTelemetry.Exporter.Stackdriver.Tests.csproj
+++ b/test/OpenTelemetry.Exporter.Stackdriver.Tests/OpenTelemetry.Exporter.Stackdriver.Tests.csproj
@@ -4,6 +4,7 @@
     <!-- OmniSharp/VS Code requires TargetFrameworks to be in descending order for IntelliSense and analysis. -->
     <TargetFrameworks>net7.0;net6.0</TargetFrameworks>
     <TargetFrameworks Condition="$(OS) == 'Windows_NT'">$(TargetFrameworks);net462</TargetFrameworks>
+    <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/test/OpenTelemetry.Exporter.Stackdriver.Tests/StackdriverExporterTests.cs b/test/OpenTelemetry.Exporter.Stackdriver.Tests/StackdriverExporterTests.cs
index c9ac11bebd..3c9a7fb4d0 100644
--- a/test/OpenTelemetry.Exporter.Stackdriver.Tests/StackdriverExporterTests.cs
+++ b/test/OpenTelemetry.Exporter.Stackdriver.Tests/StackdriverExporterTests.cs
@@ -46,13 +46,6 @@ static StackdriverExporterTests()
         ActivitySource.AddActivityListener(listener);
     }
 
-    [Fact]
-    public void StackdriverExporter_BadArgs()
-    {
-        TracerProviderBuilder builder = null;
-        Assert.Throws<ArgumentNullException>(() => builder.UseStackdriverExporter(string.Empty));
-    }
-
     [Fact]
     public void StackdriverExporter_CustomActivityProcessor()
     {
@@ -91,7 +84,7 @@ public void StackdriverExporter_CustomActivityProcessor()
     [Fact]
     public void StackdriverExporter_TraceClientThrows_ExportResultFailure()
     {
-        Exception exception = null;
+        Exception? exception;
         ExportResult result = ExportResult.Success;
         var exportedItems = new List<Activity>();
         const string ActivitySourceName = "stackdriver.test";
@@ -132,7 +125,7 @@ void RunTest(Batch<Activity> batch)
     [Fact]
     public void StackdriverExporter_TraceClientDoesNotTrow_ExportResultSuccess()
     {
-        Exception exception = null;
+        Exception? exception;
         ExportResult result = ExportResult.Failure;
         var exportedItems = new List<Activity>();
         const string ActivitySourceName = "stackdriver.test";
@@ -171,10 +164,10 @@ void RunTest(Batch<Activity> batch)
 
     internal static Activity CreateTestActivity(
         bool setAttributes = true,
-        Dictionary<string, object> additionalAttributes = null,
+        Dictionary<string, object>? additionalAttributes = null,
         bool addEvents = true,
         bool addLinks = true,
-        Resource resource = null,
+        Resource? resource = null,
         ActivityKind kind = ActivityKind.Client)
     {
         var startTimestamp = DateTime.UtcNow;
@@ -184,7 +177,7 @@ internal static Activity CreateTestActivity(
 
         var parentSpanId = ActivitySpanId.CreateFromBytes(new byte[] { 12, 23, 34, 45, 56, 67, 78, 89 });
 
-        var attributes = new Dictionary<string, object>
+        var attributes = new Dictionary<string, object?>
         {
             { "stringKey", "value" },
             { "longKey", 1L },
@@ -205,14 +198,14 @@ internal static Activity CreateTestActivity(
 
         var events = new List<ActivityEvent>
         {
-            new ActivityEvent(
+            new(
                 "Event1",
                 eventTimestamp,
                 new ActivityTagsCollection
                 {
                     { "key", "value" },
                 }),
-            new ActivityEvent(
+            new(
                 "Event2",
                 eventTimestamp,
                 new ActivityTagsCollection
@@ -226,7 +219,7 @@ internal static Activity CreateTestActivity(
         var activitySource = new ActivitySource(nameof(CreateTestActivity));
 
         var tags = setAttributes ?
-            attributes.Select(kvp => new KeyValuePair<string, object>(kvp.Key, kvp.Value?.ToString()))
+            attributes.Select(kvp => new KeyValuePair<string, object?>(kvp.Key, kvp.Value?.ToString()))
             : null;
         var links = addLinks ?
             new[]
@@ -244,7 +237,7 @@ internal static Activity CreateTestActivity(
             parentContext: new ActivityContext(traceId, parentSpanId, ActivityTraceFlags.Recorded),
             tags,
             links,
-            startTime: startTimestamp);
+            startTime: startTimestamp)!;
 
         if (addEvents)
         {
diff --git a/test/OpenTelemetry.Exporter.Stackdriver.Tests/TestActivityProcessor.cs b/test/OpenTelemetry.Exporter.Stackdriver.Tests/TestActivityProcessor.cs
index c4a55c3755..477140520c 100644
--- a/test/OpenTelemetry.Exporter.Stackdriver.Tests/TestActivityProcessor.cs
+++ b/test/OpenTelemetry.Exporter.Stackdriver.Tests/TestActivityProcessor.cs
@@ -21,8 +21,8 @@ namespace OpenTelemetry.Exporter.Stackdriver.Tests;
 
 public class TestActivityProcessor : BaseProcessor<Activity>, IDisposable
 {
-    public Action<Activity> StartAction;
-    public Action<Activity> EndAction;
+    public Action<Activity>? StartAction;
+    public Action<Activity>? EndAction;
 
     public TestActivityProcessor()
     {