diff --git a/Gemfile.lock b/Gemfile.lock
index e693ad5c38..ba3c8b4be8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -67,6 +67,7 @@ GEM
       mimemagic (~> 0.3.2)
     method_source (0.9.0)
     mimemagic (0.3.2)
+    mini_magick (4.8.0)
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
@@ -129,6 +130,7 @@ PLATFORMS
 DEPENDENCIES
   activetext!
   bundler (~> 1.15)
+  mini_magick
   sqlite3
   webpacker (~> 3.2.2)
 
diff --git a/activetext.gemspec b/activetext.gemspec
index 6c0fea16c6..37fe805279 100644
--- a/activetext.gemspec
+++ b/activetext.gemspec
@@ -19,6 +19,7 @@ Gem::Specification.new do |s|
   s.add_dependency "nokogiri"
 
   s.add_development_dependency "bundler", "~> 1.15"
+  s.add_development_dependency "mini_magick"
   s.add_development_dependency "sqlite3"
   s.add_development_dependency "webpacker", "~> 3.2.2"