diff --git a/lib/loofah/html5/safelist.rb b/lib/loofah/html5/safelist.rb
index fdacb3f..f98e23f 100644
--- a/lib/loofah/html5/safelist.rb
+++ b/lib/loofah/html5/safelist.rb
@@ -617,6 +617,7 @@ module SafeList
                                             "align-content",
                                             "align-items",
                                             "align-self",
+                                            "aspect-ratio",
                                             "background-color",
                                             "border-bottom-color",
                                             "border-collapse",