diff --git a/brooklyn-docs/Gemfile.lock b/brooklyn-docs/Gemfile.lock
index f48dc2b9af..a9b3be89e2 100644
--- a/brooklyn-docs/Gemfile.lock
+++ b/brooklyn-docs/Gemfile.lock
@@ -59,9 +59,9 @@ GEM
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
     mercenary (0.3.5)
-    mini_portile (0.6.2)
-    nokogiri (1.6.5)
-      mini_portile (~> 0.6.0)
+    mini_portile2 (2.4.0)
+    nokogiri (1.9.1)
+      mini_portile2 (~> 2.4.0)
     parallel (1.3.3)
     parslet (1.5.0)
       blankslate (~> 2.0)