diff --git a/plugin/src/main/java/org/opensearch/ml/action/model_group/TransportUpdateModelGroupAction.java b/plugin/src/main/java/org/opensearch/ml/action/model_group/TransportUpdateModelGroupAction.java
index 1c8bb32777..eb109b7adf 100644
--- a/plugin/src/main/java/org/opensearch/ml/action/model_group/TransportUpdateModelGroupAction.java
+++ b/plugin/src/main/java/org/opensearch/ml/action/model_group/TransportUpdateModelGroupAction.java
@@ -218,7 +218,7 @@ private void validateRequestForAccessControl(MLUpdateModelGroupInput input, User
             && !modelAccessControlHelper.isAdmin(user)
             && !modelAccessControlHelper.isOwnerStillHasPermission(user, mlModelGroup)) {
             throw new IllegalArgumentException(
-                "You don’t have the specified backend role to update this model group. For more information, contact your administrator."
+                "You don't have the specified backend role to update this model group. For more information, contact your administrator."
             );
         }
         AccessMode accessMode = input.getModelAccessMode();
@@ -230,7 +230,7 @@ private void validateRequestForAccessControl(MLUpdateModelGroupInput input, User
                 throw new IllegalArgumentException("Admin users cannot add all backend roles to a model group.");
             }
             if (Boolean.TRUE.equals(input.getIsAddAllBackendRoles()) && CollectionUtils.isEmpty(user.getBackendRoles())) {
-                throw new IllegalArgumentException("You don’t have any backend roles.");
+                throw new IllegalArgumentException("You don't have any backend roles.");
             }
             if (CollectionUtils.isEmpty(input.getBackendRoles()) && Boolean.FALSE.equals(input.getIsAddAllBackendRoles())) {
                 throw new IllegalArgumentException("You have to specify backend roles when add all backend roles is set to false.");
diff --git a/plugin/src/test/java/org/opensearch/ml/action/model_group/TransportUpdateModelGroupActionTests.java b/plugin/src/test/java/org/opensearch/ml/action/model_group/TransportUpdateModelGroupActionTests.java
index 70cb0cbdc9..1a67977291 100644
--- a/plugin/src/test/java/org/opensearch/ml/action/model_group/TransportUpdateModelGroupActionTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/action/model_group/TransportUpdateModelGroupActionTests.java
@@ -172,7 +172,7 @@ public void test_OwnerNoMoreHasPermissionException() {
         ArgumentCaptor<Exception> argumentCaptor = ArgumentCaptor.forClass(Exception.class);
         verify(actionListener).onFailure(argumentCaptor.capture());
         assertEquals(
-            "You don’t have the specified backend role to update this model group. For more information, contact your administrator.",
+            "You don't have the specified backend role to update this model group. For more information, contact your administrator.",
             argumentCaptor.getValue().getMessage()
         );
     }
@@ -236,7 +236,7 @@ public void test_UserWithNoBackendRolesSpecifiedRestricted() {
         transportUpdateModelGroupAction.doExecute(task, actionRequest, actionListener);
         ArgumentCaptor<Exception> argumentCaptor = ArgumentCaptor.forClass(Exception.class);
         verify(actionListener).onFailure(argumentCaptor.capture());
-        assertEquals("You don’t have any backend roles.", argumentCaptor.getValue().getMessage());
+        assertEquals("You don't have any backend roles.", argumentCaptor.getValue().getMessage());
     }
 
     public void test_UserSpecifiedRestrictedButNoBackendRolesField() {
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/MLModelGroupRestIT.java b/plugin/src/test/java/org/opensearch/ml/rest/MLModelGroupRestIT.java
index 7214079b55..92ea494cf5 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/MLModelGroupRestIT.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/MLModelGroupRestIT.java
@@ -954,7 +954,7 @@ public void test_RegisterModelGroupForUser4WithPublic() throws IOException {
                 updateModelGroup(user4Client, modelGroupId, TestHelper.toJsonString(mlUpdateModelGroupInput), null);
             } catch (Exception e) {
                 assertEquals(ResponseException.class, e.getClass());
-                assertTrue(Throwables.getStackTraceAsString(e).contains("You don’t have any backend roles."));
+                assertTrue(Throwables.getStackTraceAsString(e).contains("You don't have any backend roles."));
             }
             try {
                 mlUpdateModelGroupInput = createUpdateModelGroupInput(
@@ -1020,7 +1020,7 @@ public void test_RegisterModelGroupForUser4WithPrivate() throws IOException {
                 updateModelGroup(user4Client, modelGroupId, TestHelper.toJsonString(mlUpdateModelGroupInput), null);
             } catch (Exception e) {
                 assertEquals(ResponseException.class, e.getClass());
-                assertTrue(Throwables.getStackTraceAsString(e).contains("You don’t have any backend roles."));
+                assertTrue(Throwables.getStackTraceAsString(e).contains("You don't have any backend roles."));
             }
             try {
                 mlUpdateModelGroupInput = createUpdateModelGroupInput(modelGroupId, "name", "description", null, null, null);