diff --git a/public/robots.txt b/public/robots.txt
index 61e736fd1..eb0c67cc8 100644
--- a/public/robots.txt
+++ b/public/robots.txt
@@ -123,13 +123,27 @@ Disallow: /
 User-agent: WebReaper
 Disallow: /
 
-# Per their statement, semrushbot respects crawl-delay directives
-# We want them to overall stay within reasonable request rates to
-# the backend (20 rps); keeping in mind that the crawl-delay will 
-# be applied by site and not globally by the bot, 5 seconds seem
-# like a reasonable approximation
+# Semrush seem to crawl everything.
 User-agent: SemrushBot
-Crawl-delay: 5
+Disallow: /
+ 
+User-agent: SiteAuditBot
+Disallow: /
+ 
+User-agent: SemrushBot-BA
+Disallow: /
+ 
+User-agent: SemrushBot-SI
+Disallow: /
+ 
+User-agent: SemrushBot-SWA
+Disallow: /
+ 
+User-agent: SplitSignalBot
+Disallow: /
+ 
+User-agent: SemrushBot-OCOB
+Disallow: /
 
 #
 # Friendly, low-speed bots are welcome viewing pages, but not