diff --git a/.travis.yml b/.travis.yml
index 358e2a8a..5b299c64 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,22 +2,16 @@ language: ruby
 dist: trusty
 cache: bundler
 rvm:
-  - 2.0
-  - 2.1
-  - 2.2
-  - 2.3
   - 2.4
   - 2.5
   - 2.6
   - ruby-head
 matrix:
   include:
-  - rvm: jruby
-    jdk: oraclejdk8
-  - rvm: jruby-9.1
-    jdk: openjdk7
+  - rvm: jruby-9.2
+    jdk: openjdk8
   - rvm: jruby-head
-    jdk: oraclejdk8
+    jdk: openjdk8
   - rvm: rbx-4
   allow_failures:
     - rvm: ruby-head
diff --git a/README.md b/README.md
index 51b275b9..1f8531ca 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ gem 'zip-zip' # will load compatibility for old rubyzip API.
 
 ## Requirements
 
-- Ruby 1.9.2 or greater
+- Ruby 2.4 or greater (for rubyzip 2.0; use 1.x for older rubies)
 
 ## Installation
 
diff --git a/rubyzip.gemspec b/rubyzip.gemspec
index 8415d87c..f8c59a18 100644
--- a/rubyzip.gemspec
+++ b/rubyzip.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
     'source_code_uri'   => "https://github.com/rubyzip/rubyzip/tree/v#{s.version}",
     'wiki_uri'          => 'https://github.com/rubyzip/rubyzip/wiki'
   }
-  s.required_ruby_version = '>= 1.9.2'
+  s.required_ruby_version = '>= 2.4'
   s.add_development_dependency 'rake', '~> 10.3'
   s.add_development_dependency 'pry', '~> 0.10'
   s.add_development_dependency 'minitest', '~> 5.4'