diff --git a/.travis.yml b/.travis.yml
index ad8ec26d..5c4ab159 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,14 +4,15 @@ script: "bundle exec rspec spec"
 env:
   - CI=true
 rvm:
-  - 2.0
-  - 2.1
   - 2.2.5
   - 2.3.1
-  - jruby-9.0.5.0
+  - jruby
   - rbx
 cache: bundler
 sudo: false
 addons:
   code_climate:
     repo_token: 5806cc8a21c03f4e2f9d3b9d98d5d9fe084b66243b1dbb27b467dbc795acdcac
+matrix:
+  allow_failures:
+    - rvm: jruby
diff --git a/Gemfile b/Gemfile
index 64dc96dc..322acabf 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,7 +15,6 @@ end
 
 group :debug do
   gem 'psych', platforms: [:mri, :rbx]
-  gem "wirble"
   gem "redcarpet", platforms: :ruby
   gem "byebug", platforms: :mri
   gem 'rubinius-debugger', platform: :rbx
diff --git a/README.md b/README.md
index 09c01390..ce2f37df 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ This is a pure-Ruby library for working with [Resource Description Framework
   not modify any of Ruby's core classes or standard library.
 * Based entirely on Ruby's autoloading, meaning that you can generally make
   use of any one part of the library without needing to load up the rest.
-* Compatible with Ruby Ruby 2.x, Rubinius and JRuby 1.7+ (in Ruby 2.0 mode).
+* Compatible with Ruby Ruby >= 2.2.2, Rubinius and JRuby 9.0+.
 * Performs auto-detection of input to select appropriate Reader class if one
   cannot be determined from file characteristics.
 
diff --git a/VERSION b/VERSION
index e9307ca5..50ffc5aa 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.0.2
+2.0.3
diff --git a/lib/rdf/cli.rb b/lib/rdf/cli.rb
index baca7d86..3ede0493 100644
--- a/lib/rdf/cli.rb
+++ b/lib/rdf/cli.rb
@@ -204,7 +204,7 @@ def call(arg)
         parse: true,
         help: "validate [options] [args...]\nvalidates parsed input (may also be used with --validate)",
         lambda: ->(argv, opts) do
-          $stdout.puts "Input is " + (repository.valid? ? "" :"in") + "valid"
+          $stdout.puts "Input is " + (repository.valid? ? "" : "in") + "valid"
         end
       }
     }
diff --git a/lib/rdf/vocabulary.rb b/lib/rdf/vocabulary.rb
index e07965a1..3aaf475b 100644
--- a/lib/rdf/vocabulary.rb
+++ b/lib/rdf/vocabulary.rb
@@ -117,7 +117,7 @@ def property(*args)
           name, options = args
           options = {label: name.to_s, vocab: self}.merge(options || {})
           uri_str = [to_s, name.to_s].join('')
-          Term.cache.delete(uri_str)  # Clear any previous entry
+          Term.cache.delete(uri_str.to_sym)  # Clear any previous entry
           prop = Term.intern(uri_str, attributes: options)
           props[name.to_sym] = prop
           # Define an accessor, except for problematic properties
@@ -295,7 +295,7 @@ def from_graph(graph, url: nil, class_name: nil, extra: nil)
           when RDF::URI("http://schema.org/inverseOf")      then :inverseOf
           when RDF::URI("http://schema.org/domainIncludes") then :domainIncludes
           when RDF::URI("http://schema.org/rangeIncludes")  then :rangeIncludes
-          else                                              statement.predicate.pname
+          else                                              statement.predicate.pname.to_sym
           end
 
           value = if statement.object.uri?
diff --git a/rdf.gemspec b/rdf.gemspec
index 6a7fa868..5011e792 100755
--- a/rdf.gemspec
+++ b/rdf.gemspec
@@ -25,7 +25,7 @@ Gem::Specification.new do |gem|
   gem.test_files         = %w()
   gem.has_rdoc           = false
 
-  gem.required_ruby_version      = '>= 2.0'
+  gem.required_ruby_version      = '>= 2.2.2'
   gem.requirements               = []
   gem.add_runtime_dependency     'link_header', '~> 0.0', '>= 0.0.8'
   gem.add_runtime_dependency     'hamster',     '~> 3.0'