diff --git a/src/Runner.Worker/ActionManager.cs b/src/Runner.Worker/ActionManager.cs
index d582a26e9..52440a019 100644
--- a/src/Runner.Worker/ActionManager.cs
+++ b/src/Runner.Worker/ActionManager.cs
@@ -395,7 +395,7 @@ namespace GitHub.Runner.Worker
                             Trace.Info($"Action cleanup plugin: {plugin.PluginTypeName}.");
                         }
                     }
-                    else if (definition.Data.Execution.ExecutionType == ActionExecutionType.Composite && !String.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
+                    else if (definition.Data.Execution.ExecutionType == ActionExecutionType.Composite && !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
                     {
                         var compositeAction = definition.Data.Execution as CompositeActionExecutionData;
                         Trace.Info($"Action steps: {compositeAction.Steps}.");
@@ -1106,7 +1106,7 @@ namespace GitHub.Runner.Worker
                     Trace.Info($"Action plugin: {(actionDefinitionData.Execution as PluginActionExecutionData).Plugin}, no more preparation.");
                     return null;
                 }
-                else if (actionDefinitionData.Execution.ExecutionType == ActionExecutionType.Composite && !String.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
+                else if (actionDefinitionData.Execution.ExecutionType == ActionExecutionType.Composite && !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
                 {
                     Trace.Info($"Action composite: {(actionDefinitionData.Execution as CompositeActionExecutionData).Steps}, no more preparation.");
                     return null;
diff --git a/src/Runner.Worker/ActionManifestManager.cs b/src/Runner.Worker/ActionManifestManager.cs
index b210d7938..1dbf35ace 100644
--- a/src/Runner.Worker/ActionManifestManager.cs
+++ b/src/Runner.Worker/ActionManifestManager.cs
@@ -360,7 +360,7 @@ namespace GitHub.Runner.Worker
                         preIfToken = run.Value.AssertString("pre-if");
                         break;
                     case "steps":
-                        if (!String.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
+                        if (!string.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
                         {
                             var steps = run.Value.AssertSequence("steps");
                             var evaluator = executionContext.ToPipelineTemplateEvaluator();
@@ -415,7 +415,7 @@ namespace GitHub.Runner.Worker
                         };
                     }
                 }
-                else if (string.Equals(usingToken.Value, "composite", StringComparison.OrdinalIgnoreCase) && !String.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
+                else if (string.Equals(usingToken.Value, "composite", StringComparison.OrdinalIgnoreCase) && !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
                 {
                     if (stepsLoaded == null)
                     {
diff --git a/src/Runner.Worker/StepsRunner.cs b/src/Runner.Worker/StepsRunner.cs
index 6a0e2b694..3c7b38d4a 100644
--- a/src/Runner.Worker/StepsRunner.cs
+++ b/src/Runner.Worker/StepsRunner.cs
@@ -68,7 +68,7 @@ namespace GitHub.Runner.Worker
                 var step = jobContext.JobSteps.Dequeue();
                 var nextStep = jobContext.JobSteps.Count > 0 ? jobContext.JobSteps.Peek() : null;
                 // TODO: Fix this temporary workaround for Composite Actions
-                if (!String.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
+                if (!string.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
                 {
                     nextStep = null;
                 }
@@ -415,7 +415,7 @@ namespace GitHub.Runner.Worker
                     executionContext.Debug($"Initializing scope '{scope.Name}'");
                     executionContext.ExpressionValues["steps"] = stepsContext.GetScope(scope.ParentName);
                     // TODO: Fix this temporary workaround for Composite Actions
-                    if (!executionContext.ExpressionValues.ContainsKey("inputs") && !String.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
+                    if (!executionContext.ExpressionValues.ContainsKey("inputs") && !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
                     {
                         executionContext.ExpressionValues["inputs"] = !String.IsNullOrEmpty(scope.ParentName) ? scopeInputs[scope.ParentName] : null;
                     }
@@ -442,7 +442,7 @@ namespace GitHub.Runner.Worker
             var scopeName = executionContext.ScopeName;
             executionContext.ExpressionValues["steps"] = stepsContext.GetScope(scopeName);
             // TODO: Fix this temporary workaround for Composite Actions
-            if (!executionContext.ExpressionValues.ContainsKey("inputs") && !String.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
+            if (!executionContext.ExpressionValues.ContainsKey("inputs") && !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
             {
                 executionContext.ExpressionValues["inputs"] = string.IsNullOrEmpty(scopeName) ? null : scopeInputs[scopeName];
             }