diff --git a/.gitignore b/.gitignore
index f80b5fd..d20dc54 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,9 @@
 /tmp/
 .DS_Store
 
+## RubyMine Ide files
+.idea/
+
 ## Specific to RubyMotion:
 .dat*
 .repl_history
diff --git a/Gemfile.lock b/Gemfile.lock
index 1343d3e..fb2770f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,6 @@ PATH
   remote: .
   specs:
     rucaptcha (0.4.4)
-      posix-spawn (>= 0.3.0)
 
 GEM
   remote: https://rubygems.org/
@@ -45,12 +44,14 @@ GEM
     arel (6.0.3)
     builder (3.2.2)
     concurrent-ruby (1.0.2)
+    concurrent-ruby (1.0.2-java)
     diff-lcs (1.2.5)
     erubis (2.7.0)
     globalid (0.3.6)
       activesupport (>= 4.1.0)
     i18n (0.7.0)
     json (1.8.3)
+    json (1.8.3-java)
     loofah (2.0.3)
       nokogiri (>= 1.5.9)
     mail (2.6.4)
@@ -63,7 +64,7 @@ GEM
     minitest (5.9.0)
     nokogiri (1.6.7.2)
       mini_portile2 (~> 2.0.0.rc2)
-    posix-spawn (0.3.11)
+    nokogiri (1.6.7.2-java)
     rack (1.6.4)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -114,10 +115,12 @@ GEM
       sprockets (>= 3.0.0)
     thor (0.19.1)
     thread_safe (0.3.5)
+    thread_safe (0.3.5-java)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
 
 PLATFORMS
+  java
   ruby
 
 DEPENDENCIES
@@ -128,4 +131,4 @@ DEPENDENCIES
   rucaptcha!
 
 BUNDLED WITH
-   1.11.2
+   1.12.4
diff --git a/lib/rucaptcha/captcha.rb b/lib/rucaptcha/captcha.rb
index 05beded..eda910c 100644
--- a/lib/rucaptcha/captcha.rb
+++ b/lib/rucaptcha/captcha.rb
@@ -1,4 +1,4 @@
-require 'posix-spawn'
+require 'open3'
 
 module RuCaptcha
   class Captcha
@@ -77,11 +77,9 @@ module RuCaptcha
           png_file_path
         else
           command.strip!
-          pid, _, stdout, stderr = POSIX::Spawn.popen4(command)
-          Process.waitpid(pid)
-          err = stderr.read
+          out, err, st = Open3.capture3(command)
           raise "RuCaptcha: #{err.strip}" if err.present?
-          stdout.read
+          out
         end
       end
     end
diff --git a/rucaptcha.gemspec b/rucaptcha.gemspec
index eda9bea..c672f27 100644
--- a/rucaptcha.gemspec
+++ b/rucaptcha.gemspec
@@ -13,7 +13,6 @@ Gem::Specification.new do |s|
   s.require_paths = ['lib']
   s.summary = 'This is a Captcha gem for Rails Application. It run ImageMagick command to draw Captcha image.'
 
-  s.add_dependency 'posix-spawn', '>= 0.3.0'
 
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rails'