diff --git a/Gemfile.lock b/Gemfile.lock
index ba583fc..96cf7a5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -29,8 +29,8 @@ GEM
       i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     afm (0.2.2)
     asciidoctor (1.5.6.1)
     asciidoctor-pdf (1.5.0.alpha.16)
@@ -50,10 +50,10 @@ GEM
     awesome_print (1.8.0)
     coderay (1.1.2)
     concurrent-ruby (1.0.5)
-    css_parser (1.6.0)
+    css_parser (1.9.0)
       addressable
     epubcheck (3.0.1)
-    faraday (0.14.0)
+    faraday (0.17.4)
       multipart-post (>= 1.2, < 3)
     faraday-http-cache (2.0.0)
       faraday (~> 0.8)
@@ -70,7 +70,7 @@ GEM
     mini_portile2 (2.1.0)
     minitest (5.11.3)
     multi_json (1.13.1)
-    multipart-post (2.0.0)
+    multipart-post (2.1.1)
     nokogiri (1.6.8.1)
       mini_portile2 (~> 2.1.0)
     octokit (4.8.0)
@@ -96,7 +96,7 @@ GEM
     prawn-templates (0.1.1)
       pdf-reader (~> 2.0)
       prawn (~> 2.2)
-    public_suffix (3.0.2)
+    public_suffix (4.0.6)
     pygments.rb (1.2.1)
       multi_json (>= 1.0.0)
     rainbow (3.0.0)
@@ -105,13 +105,13 @@ GEM
     ruby-rc4 (0.1.5)
     rubyzip (1.2.1)
     safe_yaml (1.0.4)
-    sawyer (0.8.1)
-      addressable (>= 2.3.5, < 2.6)
-      faraday (~> 0.8, < 1.0)
+    sawyer (0.8.2)
+      addressable (>= 2.3.5)
+      faraday (> 0.8, < 2.0)
     thread_safe (0.3.6)
     treetop (1.5.3)
       polyglot (~> 0.3)
-    ttfunk (1.5.1)
+    ttfunk (1.7.0)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)