diff --git a/Gemfile b/Gemfile
index 8b9d62a..e3f50fc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -31,6 +31,7 @@ gem "rexml"
 gem "babosa"
 gem "pinboard", git: "https://github.com/dnitza/pinboard", branch: "master"
 gem "ogpr"
+gem "ruby-filemagic"
 
 group :cli, :development do
   gem "hanami-reloader"
diff --git a/Gemfile.lock b/Gemfile.lock
index 9541d27..8a6dfa9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -310,6 +310,7 @@ GEM
     rubocop-performance (1.15.2)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
+    ruby-filemagic (0.7.3)
     ruby-progressbar (1.11.0)
     ruby2_keywords (0.0.5)
     sequel (5.65.0)
@@ -373,6 +374,7 @@ DEPENDENCIES
   rexml
   rom-factory
   rom-sql
+  ruby-filemagic
   slim
   standardrb
   timecop