diff --git a/libmalcontent-ui/gs-content-rating.c b/libmalcontent-ui/gs-content-rating.c
index ced6a92..feb06af 100644
--- a/libmalcontent-ui/gs-content-rating.c
+++ b/libmalcontent-ui/gs-content-rating.c
@@ -577,51 +577,6 @@ static const struct {
 };
 #endif  /* appstream-glib < 0.7.18 */
 
-#if !AS_CHECK_VERSION(0, 7, 15)
-/**
- * as_content_rating_id_value_to_csm_age:
- * @id: the subsection ID e.g. "violence-cartoon"
- * @value: the #AsContentRatingValue, e.g. %MCT_APP_FILTER_OARS_VALUE_INTENSE
- *
- * Gets the Common Sense Media approved age for a specific rating level.
- *
- * Returns: The age in years, or 0 for no details.
- *
- * Since: 0.5.12
- **/
-guint
-as_content_rating_id_value_to_csm_age (const gchar *id, MctAppFilterOarsValue value)
-{
-	if (value == AS_CONTENT_RATING_VALUE_UNKNOWN ||
-	    value == AS_CONTENT_RATING_VALUE_LAST)
-		return 0;
-
-	for (gsize i = 0; i < G_N_ELEMENTS (oars_to_csm_mappings); i++) {
-		if (g_str_equal (id, oars_to_csm_mappings[i].id)) {
-			switch (value) {
-			case AS_CONTENT_RATING_VALUE_NONE:
-				return oars_to_csm_mappings[i].csm_age_none;
-			case AS_CONTENT_RATING_VALUE_MILD:
-				return oars_to_csm_mappings[i].csm_age_mild;
-			case AS_CONTENT_RATING_VALUE_MODERATE:
-				return oars_to_csm_mappings[i].csm_age_moderate;
-			case AS_CONTENT_RATING_VALUE_INTENSE:
-				return oars_to_csm_mappings[i].csm_age_intense;
-			case AS_CONTENT_RATING_VALUE_UNKNOWN:
-			case AS_CONTENT_RATING_VALUE_LAST:
-			default:
-				/* Handled above. */
-				g_assert_not_reached ();
-				return 0;
-			}
-		}
-	}
-
-	/* @id not found. */
-	return 0;
-}
-#endif  /* appstream-glib < 0.7.15 */
-
 #if !AS_CHECK_VERSION(0, 7, 18)
 /**
  * as_content_rating_id_csm_age_to_value:
diff --git a/libmalcontent-ui/meson.build b/libmalcontent-ui/meson.build
index b4e70c7..1cfa354 100644
--- a/libmalcontent-ui/meson.build
+++ b/libmalcontent-ui/meson.build
@@ -36,7 +36,7 @@ libmalcontent_ui_public_deps = [
   libmalcontent_dep,
 ]
 libmalcontent_ui_private_deps = [
-  dependency('appstream-glib'),
+  dependency('appstream-glib', version: '>= 0.7.15'),
   dependency('flatpak'),
 ]
 
diff --git a/libmalcontent-ui/user-controls.c b/libmalcontent-ui/user-controls.c
index 8689a78..06a7428 100644
--- a/libmalcontent-ui/user-controls.c
+++ b/libmalcontent-ui/user-controls.c
@@ -167,40 +167,6 @@ static const GActionEntry actions[] = {
   { "set-age", on_set_age_action_activated, "u", NULL, NULL, { 0, }}
 };
 
-#if !AS_CHECK_VERSION(0, 7, 15)
-static const gchar * const oars_categories[] =
-{
-  "violence-cartoon",
-  "violence-fantasy",
-  "violence-realistic",
-  "violence-bloodshed",
-  "violence-sexual",
-  "violence-desecration",
-  "violence-slavery",
-  "violence-worship",
-  "drugs-alcohol",
-  "drugs-narcotics",
-  "drugs-tobacco",
-  "sex-nudity",
-  "sex-themes",
-  "sex-homosexuality",
-  "sex-prostitution",
-  "sex-adultery",
-  "sex-appearance",
-  "language-profanity",
-  "language-humor",
-  "language-discrimination",
-  "social-chat",
-  "social-info",
-  "social-audio",
-  "social-location",
-  "social-contacts",
-  "money-purchasing",
-  "money-gambling",
-  NULL
-};
-#endif  /* appstream-glib < 0.7.15 */
-
 /* Auxiliary methods */
 
 static GsContentRatingSystem
@@ -388,9 +354,7 @@ update_oars_level (MctUserControls *self)
   guint maximum_age;
   gsize i;
   gboolean all_categories_unset;
-#if AS_CHECK_VERSION(0, 7, 15)
   g_autofree const gchar **oars_categories = as_content_rating_get_all_rating_ids ();
-#endif
 
   g_assert (self->filter != NULL);
 
@@ -1495,9 +1459,7 @@ mct_user_controls_build_app_filter (MctUserControls     *self,
 {
   gboolean restrict_web_browsers;
   gsize i;
-#if AS_CHECK_VERSION(0, 7, 15)
   g_autofree const gchar **oars_categories = as_content_rating_get_all_rating_ids ();
-#endif
 
   g_return_if_fail (MCT_IS_USER_CONTROLS (self));
   g_return_if_fail (builder != NULL);