diff --git a/.travis.yml b/.travis.yml
index dcf761a..d6e148d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,11 @@
 language: ruby
 rvm:
-  - 2.3.1
-  - 2.2
-  - 2.1
-  - 2.0
+  - 3.1
+  - 3.0
+  - 2.7
+  - 2.6
+  - 2.5
+  - 2.4
 cache:
   bundler: true
 sudo: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 881b38c..2ac9d32 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,29 +6,29 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    diff-lcs (1.2.5)
-    json (2.0.2)
-    rake (12.0.0)
-    rspec (3.5.0)
-      rspec-core (~> 3.5.0)
-      rspec-expectations (~> 3.5.0)
-      rspec-mocks (~> 3.5.0)
-    rspec-core (3.5.4)
-      rspec-support (~> 3.5.0)
-    rspec-expectations (3.5.0)
+    diff-lcs (1.5.0)
+    json (2.6.1)
+    rake (13.0.6)
+    rspec (3.11.0)
+      rspec-core (~> 3.11.0)
+      rspec-expectations (~> 3.11.0)
+      rspec-mocks (~> 3.11.0)
+    rspec-core (3.11.0)
+      rspec-support (~> 3.11.0)
+    rspec-expectations (3.11.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-mocks (3.5.0)
+      rspec-support (~> 3.11.0)
+    rspec-mocks (3.11.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-support (3.5.0)
+      rspec-support (~> 3.11.0)
+    rspec-support (3.11.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  bundler (~> 1.13)
-  json (~> 2.0)
+  bundler (~> 2)
+  json (~> 2.6)
   kmts!
-  rake (~> 12.0)
-  rspec (~> 3.5)
+  rake (~> 13)
+  rspec (~> 3)
diff --git a/kmts.gemspec b/kmts.gemspec
index d807865..7d0fb68 100644
--- a/kmts.gemspec
+++ b/kmts.gemspec
@@ -13,12 +13,13 @@ Gem::Specification.new do |s|
   s.description = "A threadsafe Ruby gem that can be used to interact with the Kissmetrics tracking API."
 
   s.required_rubygems_version = ">= 1.3.6"
+  s.required_ruby_version     = Gem::Requirement.new(">= 2.4.0")
   s.rubyforge_project         = "kissmetrics"
 
-  s.add_development_dependency "bundler", "~> 1.13"
-  s.add_development_dependency "rspec", "~> 3.5"
-  s.add_development_dependency "rake", "~> 12.0"
-  s.add_development_dependency "json", "~> 2.0"
+  s.add_development_dependency "bundler", "~> 2"
+  s.add_development_dependency "json", "~> 2.6"
+  s.add_development_dependency "rake", "~> 13"
+  s.add_development_dependency "rspec", "~> 3"
 
   s.files        = `git ls-files`.split("\n")
   s.test_files   = `git ls-files -- {test,spec,features}/*`.split("\n")