diff --git a/Gemfile b/Gemfile
index 4b7598a..66f5afb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,6 @@
 source "https://rubygems.org"
 
+gem "base64"
 gem "logger"
 gem "nokogiri"
 gem "phlex"
diff --git a/Gemfile.lock b/Gemfile.lock
index 9083d92..aec3c3e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,6 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.3)
+    base64 (0.3.0)
     bigdecimal (3.1.9)
     concurrent-ruby (1.3.8)
     csv (3.3.6)
@@ -125,6 +126,7 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
+  base64
   hegeltest
   irb
   logger
@@ -144,6 +146,7 @@ DEPENDENCIES
 
 CHECKSUMS
   ast (2.4.3) sha256=954615157c1d6a382bc27d690d973195e79db7f55e9765ac7c481c60bdb4d383
+  base64 (0.3.0) sha256=27337aeabad6ffae05c265c450490628ef3ebd4b67be58257393227588f5a97b
   bigdecimal (3.1.9) sha256=2ffc742031521ad69c2dfc815a98e426a230a3d22aeac1995826a75dabfad8cc
   concurrent-ruby (1.3.8) sha256=b2f1be836e968ccc78ccfce277ea79c72a88633f22306782c16ff23fb415d1e1
   csv (3.3.6) sha256=aba61e7e507a66f03d45cb1f3c4b6359861c3504038b422962875dce099e4456