diff --git a/Gemfile b/Gemfile
index 505eb3165..58e8b9213 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,4 @@
 source "https://rubygems.org"
 
 gem "cocoapods", "1.16.1"
+gem "rexml", ">= 3.4.2"
diff --git a/Gemfile.lock b/Gemfile.lock
index 455a10c51..9bc7ba0fc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -87,7 +87,7 @@ GEM
     netrc (0.11.0)
     nkf (0.2.0)
     public_suffix (4.0.7)
-    rexml (3.3.9)
+    rexml (3.4.4)
     ruby-macho (2.5.1)
     securerandom (0.4.0)
     typhoeus (1.4.1)
@@ -107,6 +107,7 @@ PLATFORMS
 
 DEPENDENCIES
   cocoapods (= 1.16.1)
+  rexml (>= 3.4.2)
 
 BUNDLED WITH
    2.5.11