diff --git a/layouts/sitemap.xml b/layouts/sitemap.xml
index d13d9280..f931c442 100644
--- a/layouts/sitemap.xml
+++ b/layouts/sitemap.xml
@@ -17,11 +17,17 @@
                     {{- . -}}
                 </changefreq>
             {{- end -}}
+
             {{- if ge .Sitemap.Priority 0.0 -}}
-                <priority>
-                    {{- .Sitemap.Priority -}}
-                </priority>
+                {{- $weeks := div (sub now.Unix .Lastmod.Unix) 604800 -}}
+                {{- $priority := sub 1 (div $weeks 10.0 ) -}}
+                {{- if ge .Sitemap.Priority $priority -}}
+                    <priority>{{ .Sitemap.Priority }}</priority>
+                {{- else -}}
+                    <priority>{{ $priority }}</priority>
+                {{- end -}}
             {{- end -}}
+
             {{- if .IsTranslated -}}
                 {{- range .Translations -}}
                     <xhtml:link