diff --git a/.github/workflows/presubmit.yml b/.github/workflows/presubmit.yml
index 8ef7e663e0..2aedc199f1 100644
--- a/.github/workflows/presubmit.yml
+++ b/.github/workflows/presubmit.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         mainmatrix: [true]
-        os: [ubuntu-20.04, macos-11.0]
+        os: [ubuntu-20.04, macos-latest]
         include:
           - os: ubuntu-20.04
             mainmatrix: true
diff --git a/test_conformance/api/test_mem_object_info.cpp b/test_conformance/api/test_mem_object_info.cpp
index ccfeaafa13..2afe043768 100644
--- a/test_conformance/api/test_mem_object_info.cpp
+++ b/test_conformance/api/test_mem_object_info.cpp
@@ -348,14 +348,7 @@ int test_get_buffer_info( cl_device_id deviceID, cl_context context, cl_command_
             TEST_MEM_OBJECT_PARAM( subBufferObject, CL_MEM_ASSOCIATED_MEMOBJECT, origObj, (cl_mem)bufferObject, "associated mem object", "%p", void * )
 
             TEST_MEM_OBJECT_PARAM( subBufferObject, CL_MEM_OFFSET, offset, (size_t)( addressAlign ), "offset", "%ld", size_t )
-
-            clReleaseMemObject( subBufferObject );
-            subBufferObject = NULL;
-
         }
-
-        clReleaseMemObject( bufferObject );
-        bufferObject = NULL;
     }
 
     return CL_SUCCESS;
diff --git a/test_conformance/api/test_mem_objects.cpp b/test_conformance/api/test_mem_objects.cpp
index c29613f9fe..f1a4e99339 100644
--- a/test_conformance/api/test_mem_objects.cpp
+++ b/test_conformance/api/test_mem_objects.cpp
@@ -48,12 +48,7 @@ int test_mem_object_destructor_callback_single(clMemWrapper &memObject)
     test_error(error, "Unable to set destructor callback");
 
     // Now release the buffer, which SHOULD call the callbacks
-    error = clReleaseMemObject(memObject);
-    test_error(error, "Unable to release test buffer");
-
-    // Note: since we manually released the mem wrapper, we need to set it to
-    // NULL to prevent a double-release
-    memObject = NULL;
+    memObject.reset();
 
     // At this point, all three callbacks should have already been called
     int numErrors = 0;