diff --git a/Gemfile.lock b/Gemfile.lock
index 5b6d6c9..969022e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,6 +15,7 @@ GEM
       sys-uname
     autotest-growl (0.2.16)
     awesome_print (1.0.2)
+    concurrent-ruby (1.1.10)
     diff-lcs (1.1.3)
     faker (0.9.5)
       i18n (~> 0.4)
@@ -42,7 +43,8 @@ GEM
     rspec-mocks (2.7.0)
     sys-uname (1.0.2)
       ffi (>= 1.0.0)
-    tzinfo (0.3.31)
+    tzinfo (2.0.5)
+      concurrent-ruby (~> 1.0)
 
 PLATFORMS
   ruby
@@ -62,7 +64,7 @@ DEPENDENCIES
   retriable (~> 3.1.1)
   rspec (~> 2.7.0)
   thrillcall-api!
-  tzinfo (~> 0.3.31)
+  tzinfo (~> 2.0.5)
 
 BUNDLED WITH
    1.15.4
diff --git a/thrillcall-api.gemspec b/thrillcall-api.gemspec
index 2132ea2..fcd963a 100644
--- a/thrillcall-api.gemspec
+++ b/thrillcall-api.gemspec
@@ -26,7 +26,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency  "nokogiri",               "~> 1.8.0"
   s.add_development_dependency  "pygments.rb",            "~> 1.2.0"
   s.add_development_dependency  "faker",                  "~> 0.9.5"
-  s.add_development_dependency  "tzinfo",                 "~> 0.3.31"
+  s.add_development_dependency  "tzinfo",                 "~> 2.0.5"
 
   s.add_dependency              "faraday",                "~> 0.8.7"
   s.add_dependency              "retriable",              "~> 3.1.1"