diff --git a/appveyor.yml b/appveyor.yml
index eb9ca299c3..977d6f1150 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -5,7 +5,7 @@ environment:
   COVERALLS_REPO_TOKEN:
     secure: T0PmP8uyzCseacBCDRBlti2y9Tz5DL6fknea0MKWvbPYrzADmLY2/5kOTfYIsPUk
   # If you bump this, don't forget to bump `MinimumMockVersion` in `BaseStripeTest.cs` as well.
-  STRIPE_MOCK_VERSION: 0.38.0
+  STRIPE_MOCK_VERSION: 0.39.0
 
 deploy:
 - provider: NuGet
diff --git a/src/StripeTests/BaseStripeTest.cs b/src/StripeTests/BaseStripeTest.cs
index 36d1825625..56c9b85307 100644
--- a/src/StripeTests/BaseStripeTest.cs
+++ b/src/StripeTests/BaseStripeTest.cs
@@ -19,7 +19,7 @@ public class BaseStripeTest
         /// <remarks>
         /// If you bump this, don't forget to bump `STRIPE_MOCK_VERSION` in appveyor.yml as well.
         /// </remarks>
-        private const string MockMinimumVersion = "0.38.0";
+        private const string MockMinimumVersion = "0.39.0";
 
         private static Mock<HttpClientHandler> mockHandler;
 
diff --git a/src/StripeTests/Services/Terminal/Locations/LocationServiceTest.cs b/src/StripeTests/Services/Terminal/Locations/LocationServiceTest.cs
index a6eaabb9c1..3398cf4f29 100644
--- a/src/StripeTests/Services/Terminal/Locations/LocationServiceTest.cs
+++ b/src/StripeTests/Services/Terminal/Locations/LocationServiceTest.cs
@@ -38,7 +38,6 @@ public LocationServiceTest()
 
             this.listOptions = new LocationListOptions
             {
-                OperatorAccount = "acct_123",
             };
 
             this.updateOptions = new LocationUpdateOptions