diff --git a/Gemfile.lock b/Gemfile.lock
index 3ceca1d..4912441 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,11 +9,10 @@ GEM
   remote: https://rubygems.org/
   specs:
     CFPropertyList (2.3.1)
-    activesupport (4.2.1)
-      i18n (~> 0.7)
-      json (~> 1.7, >= 1.7.7)
+    activesupport (5.2.8.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
     addressable (2.3.8)
     autoparse (0.3.3)
@@ -50,6 +49,7 @@ GEM
     celluloid (0.16.0)
       timers (~> 4.0.0)
     coderay (1.1.0)
+    concurrent-ruby (1.1.10)
     diff-lcs (1.2.5)
     docker-api (1.21.0)
       excon (>= 0.38.0)
@@ -202,11 +202,12 @@ GEM
     hocon (0.0.7)
     http-cookie (1.0.2)
       domain_name (~> 0.5)
-    i18n (0.7.0)
+    i18n (1.12.0)
+      concurrent-ruby (~> 1.0)
     inflecto (0.0.2)
     inifile (2.0.2)
     ipaddress (0.8.0)
-    json (1.8.2)
+    json (1.8.6)
     json_pure (1.8.2)
     jwt (1.4.1)
     launchy (2.4.3)
@@ -228,7 +229,7 @@ GEM
     method_source (0.8.2)
     mime-types (2.4.3)
     mini_portile (0.6.2)
-    minitest (5.6.0)
+    minitest (5.17.0)
     mocha (1.1.0)
       metaclass (~> 0.0.1)
     multi_json (1.11.0)
@@ -319,7 +320,7 @@ GEM
       net-scp
       net-ssh
     thor (0.19.1)
-    thread_safe (0.3.5)
+    thread_safe (0.3.6)
     timers (4.0.1)
       hitimes
     travis (1.7.6)
@@ -338,7 +339,7 @@ GEM
     trollop (2.1.2)
     typhoeus (0.7.1)
       ethon (>= 0.7.1)
-    tzinfo (1.2.2)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     unf (0.1.4)
       unf_ext