diff --git a/History.markdown b/History.markdown
index 304b1ba3..8b2dae0f 100644
--- a/History.markdown
+++ b/History.markdown
@@ -13,6 +13,7 @@
 
 ### Development Fixes
   * Merge the theme and layout cucumber steps into one step (#1151)
+  * Restrict activesupport dependency to pre-4.0.0 to maintain compatibility with `<= 1.9.2`
 
 ### Site Enhancements
   * Add "History" page.