Android - change selected/unselected tab text color

I am having some issues changing the text color in tabs in Android. Here is my XML:

<android.support.design.widget.TabLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/sliding_tabs"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="?attr/colorPrimary"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    app:tabIndicatorColor="@color/accent"
    app:tabIndicatorHeight="4sp"
    app:tabGravity="fill"
    app:tabMode="fixed"
    app:tabTextColor="@color/tabSelected"
    app:tabSelectedTextColor="@color/tabUnselected" />

The tab indicator color/height is able to be changed, but the tab text color and selected text colors do not change, they just remain white.