diff --git a/Gemfile b/Gemfile
index 5487ccd..06eb430 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
 
-gem 'icalendar', '~> 2.8.0'
+gem 'icalendar', '~> 2.12.2'
 gem 'activesupport', '~> 4.1.11'
 gem 'pry'
diff --git a/Gemfile.lock b/Gemfile.lock
index 86ee24b..fa82858 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,16 +7,22 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.1)
       tzinfo (~> 1.1)
+    base64 (0.3.0)
     coderay (1.1.3)
     concurrent-ruby (1.2.2)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    icalendar (2.8.0)
+    icalendar (2.12.2)
+      base64
       ice_cube (~> 0.16)
-    ice_cube (0.16.4)
+      logger
+      ostruct
+    ice_cube (0.17.0)
     json (1.8.6)
+    logger (1.7.0)
     method_source (1.0.0)
     minitest (5.18.0)
+    ostruct (0.6.3)
     pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -29,7 +35,7 @@ PLATFORMS
 
 DEPENDENCIES
   activesupport (~> 4.1.11)
-  icalendar (~> 2.8.0)
+  icalendar (~> 2.12.2)
   pry
 
 BUNDLED WITH