diff --git a/Gemfile b/Gemfile
index 09969abc1..48a873c1e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -259,6 +259,8 @@ group :development do
   gem "simplecov", "0.21.2", require: false
 
   gem "turbo_dev_assets", "0.0.2"
+
+  gem "listen", "3.5.1"
 end
 
 group :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index 2025048e0..5e997d743 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -375,6 +375,9 @@ GEM
     kostya-sigar (2.0.8)
     leaflet-rails (1.6.0)
       rails (>= 4.2.0)
+    listen (3.5.1)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
     little-plugger (1.1.4)
     logging (2.3.0)
       little-plugger (~> 1.1)
@@ -834,6 +837,7 @@ DEPENDENCIES
   json-schema (= 2.8.1)
   json-schema-rspec (= 0.0.4)
   leaflet-rails (= 1.6.0)
+  listen (= 3.5.1)
   logging-rails (= 0.6.0)
   markdown-it-html5-embed (= 1.0.0)
   markerb (= 1.1.0)