diff --git a/CHANGELOG.md b/CHANGELOG.md
index c6e8537..3228984 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+0.2.3
+-----
+
+- It will raise error when call ImageMagick failed.
+
 0.2.2
 -----
 
diff --git a/Gemfile.lock b/Gemfile.lock
index a210923..4cbba90 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    rucaptcha (0.2.0)
+    rucaptcha (0.2.3)
       posix-spawn (>= 0.3.0)
 
 GEM
diff --git a/lib/rucaptcha/captcha.rb b/lib/rucaptcha/captcha.rb
index ea4790d..e0c5002 100644
--- a/lib/rucaptcha/captcha.rb
+++ b/lib/rucaptcha/captcha.rb
@@ -44,9 +44,10 @@ module RuCaptcha
         CODE
 
         command.strip!
-        # puts command
         pid, stdin, stdout, stderr = POSIX::Spawn.popen4(command)
         Process.waitpid(pid)
+        err = stderr.read
+        raise "RuCaptcha: #{err.strip}" if err != nil && err.length > 0
         stdout.read
       end
     end
diff --git a/lib/rucaptcha/version.rb b/lib/rucaptcha/version.rb
index 9847d88..e385031 100644
--- a/lib/rucaptcha/version.rb
+++ b/lib/rucaptcha/version.rb
@@ -1,3 +1,3 @@
 module RuCaptcha
-  VERSION = '0.2.2'
+  VERSION = '0.2.3'
 end