diff --git a/Gemfile.lock b/Gemfile.lock
index 9f97776..21d6b66 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,16 +13,16 @@ GEM
       i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.1)
-      public_suffix (~> 2.0, >= 2.0.2)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
     coderay (1.1.1)
     concurrent-ruby (1.0.4)
-    crack (0.4.3)
-      safe_yaml (~> 1.0.0)
+    crack (0.4.5)
+      rexml
     diff-lcs (1.3)
     faraday (0.15.3)
       multipart-post (>= 1.2, < 3)
-    hashdiff (0.3.4)
+    hashdiff (1.0.1)
     i18n (0.8.0)
     jwt (2.1.0)
     method_source (0.8.2)
@@ -41,11 +41,12 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    public_suffix (2.0.5)
+    public_suffix (3.1.1)
     rack (2.0.6)
     rack-protection (2.0.2)
       rack
     rake (11.2.2)
+    rexml (3.2.5)
     rspec (3.8.0)
       rspec-core (~> 3.8.0)
       rspec-expectations (~> 3.8.0)
@@ -59,7 +60,6 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.8.0)
     rspec-support (3.8.0)
-    safe_yaml (1.0.4)
     sinatra (2.0.2)
       mustermann (~> 1.0)
       rack (~> 2.0)
@@ -70,10 +70,10 @@ GEM
     tilt (2.0.8)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
-    webmock (3.0.1)
+    webmock (3.13.0)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
-      hashdiff
+      hashdiff (>= 0.4.0, < 2.0.0)
 
 PLATFORMS
   ruby