diff --git a/CHANGELOG.md b/CHANGELOG.md
index ee97a27..693fb1f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -54,3 +54,8 @@ semantics
 ## 2.1.1
 
 * Fix `Time` converter
+
+## 2.1.2
+
+* Fix Integer type casting: Integer parses strings with leading zeros as numbers in octal number system
+* Update version of bundler
diff --git a/README.md b/README.md
index f2f508c..fe67afa 100644
--- a/README.md
+++ b/README.md
@@ -94,7 +94,7 @@ end
 
 All converters return nil if conversion could not be made.
 
-- Integer
+- Integer (*string parsed as numbers in decimal number system*)
 - Float
 - String
 - Symbol
diff --git a/lib/tainbox/type_converter.rb b/lib/tainbox/type_converter.rb
index 668e8e4..eedcf7b 100644
--- a/lib/tainbox/type_converter.rb
+++ b/lib/tainbox/type_converter.rb
@@ -32,7 +32,7 @@ def convert
 end
 
 Tainbox.define_converter(Integer) do
-  Integer(value) rescue nil
+  value.is_a?(String) ? Integer(value, 10) : Integer(value) rescue nil
 end
 
 Tainbox.define_converter(Float) do
diff --git a/lib/tainbox/version.rb b/lib/tainbox/version.rb
index 9150c30..c2ab9ed 100644
--- a/lib/tainbox/version.rb
+++ b/lib/tainbox/version.rb
@@ -1,3 +1,3 @@
 module Tainbox
-  VERSION = '2.1.2'
+  VERSION = '2.1.3'
 end
diff --git a/spec/tainbox_spec.rb b/spec/tainbox_spec.rb
index df45762..a013c4b 100644
--- a/spec/tainbox_spec.rb
+++ b/spec/tainbox_spec.rb
@@ -166,4 +166,32 @@ def name
       expect(oliver.name).to eq('John')
     end
   end
+
+  describe "Integer type" do
+    let(:person) do
+      Class.new do
+        include Tainbox
+
+        attribute :age, Integer
+      end
+    end
+
+    let(:attributes) { Hash[age: age] }
+
+    describe 'string with radix indicators' do
+      let(:age) { "014" }
+
+      it 'uses decimal number system as base' do
+        expect(person.new(attributes).age).to eq(14)
+      end
+    end
+
+    describe 'float number' do
+      let(:age) { 14.2 }
+
+      it 'converts properly' do
+        expect(person.new(attributes).age).to eq(14)
+      end
+    end
+  end
 end
diff --git a/tainbox.gemspec b/tainbox.gemspec
index 52b18cf..372c3e9 100644
--- a/tainbox.gemspec
+++ b/tainbox.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency 'activesupport'
 
-  spec.add_development_dependency 'bundler', '~> 1.8'
+  spec.add_development_dependency 'bundler', '~> 2.0'
   spec.add_development_dependency 'rake', '~> 10.0'
   spec.add_development_dependency 'pry'
   spec.add_development_dependency 'rspec'