diff --git a/src/Xunit.StaFact/Sdk/UITheoryTestCase.cs b/src/Xunit.StaFact/Sdk/UITheoryTestCase.cs
index f8955f8a..827d8d7f 100644
--- a/src/Xunit.StaFact/Sdk/UITheoryTestCase.cs
+++ b/src/Xunit.StaFact/Sdk/UITheoryTestCase.cs
@@ -25,13 +25,11 @@ public UITheoryTestCase(UITestCase.SyncContextType synchronizationContextType, I
 
         internal UITestCase.SyncContextType SynchronizationContextType { get; private set; }
 
-        internal ThreadRental ThreadRental { get; private set; }
-
         public override async Task<RunSummary> RunAsync(IMessageSink diagnosticMessageSink, IMessageBus messageBus, object[] constructorArguments, ExceptionAggregator aggregator, CancellationTokenSource cancellationTokenSource)
         {
-            this.ThreadRental = await ThreadRental.CreateAsync(UITestCase.GetAdapter(this.SynchronizationContextType), this.TestMethod);
-            await this.ThreadRental.SynchronizationContext;
-            return await new UITheoryTestCaseRunner(this, this.DisplayName, this.SkipReason, constructorArguments, diagnosticMessageSink, messageBus, aggregator, cancellationTokenSource).RunAsync();
+            using var threadRental = await ThreadRental.CreateAsync(UITestCase.GetAdapter(this.SynchronizationContextType), this.TestMethod);
+            await threadRental.SynchronizationContext;
+            return await new UITheoryTestCaseRunner(this, this.DisplayName, this.SkipReason, constructorArguments, diagnosticMessageSink, messageBus, aggregator, cancellationTokenSource, threadRental).RunAsync();
         }
 
         public override void Deserialize(IXunitSerializationInfo data)
@@ -47,11 +45,5 @@ public override void Serialize(IXunitSerializationInfo data)
 
             data.AddValue("SyncContextType", this.SynchronizationContextType.ToString());
         }
-
-        public override void Dispose()
-        {
-            this.ThreadRental?.Dispose();
-            base.Dispose();
-        }
     }
 }
diff --git a/src/Xunit.StaFact/Sdk/UITheoryTestCaseRunner.cs b/src/Xunit.StaFact/Sdk/UITheoryTestCaseRunner.cs
index f43ca934..04e4d887 100644
--- a/src/Xunit.StaFact/Sdk/UITheoryTestCaseRunner.cs
+++ b/src/Xunit.StaFact/Sdk/UITheoryTestCaseRunner.cs
@@ -11,14 +11,17 @@ namespace Xunit.Sdk
 
     public class UITheoryTestCaseRunner : XunitTheoryTestCaseRunner
     {
-        public UITheoryTestCaseRunner(UITheoryTestCase testCase, string displayName, string skipReason, object[] constructorArguments, IMessageSink diagnosticMessageSink, IMessageBus messageBus, ExceptionAggregator aggregator, CancellationTokenSource cancellationTokenSource)
+        private readonly ThreadRental threadRental;
+
+        internal UITheoryTestCaseRunner(UITheoryTestCase testCase, string displayName, string skipReason, object[] constructorArguments, IMessageSink diagnosticMessageSink, IMessageBus messageBus, ExceptionAggregator aggregator, CancellationTokenSource cancellationTokenSource, ThreadRental threadRental)
             : base(testCase, displayName, skipReason, constructorArguments, diagnosticMessageSink, messageBus, aggregator, cancellationTokenSource)
         {
+            this.threadRental = threadRental;
         }
 
         internal new UITheoryTestCase TestCase => (UITheoryTestCase)base.TestCase;
 
         protected override XunitTestRunner CreateTestRunner(ITest test, IMessageBus messageBus, Type testClass, object[] constructorArguments, MethodInfo testMethod, object[] testMethodArguments, string skipReason, IReadOnlyList<BeforeAfterTestAttribute> beforeAfterAttributes, ExceptionAggregator aggregator, CancellationTokenSource cancellationTokenSource)
-            => new UITestRunner(test, messageBus, testClass, constructorArguments, testMethod, testMethodArguments, skipReason, beforeAfterAttributes, aggregator, cancellationTokenSource, this.TestCase.ThreadRental);
+            => new UITestRunner(test, messageBus, testClass, constructorArguments, testMethod, testMethodArguments, skipReason, beforeAfterAttributes, aggregator, cancellationTokenSource, this.threadRental);
     }
 }