diff --git a/.gitignore b/.gitignore
index b3b3320..b85ec71 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,5 @@
 *.log
 
 test_binaries\.sh
+
+test/reports/
diff --git a/lib/apk_analyzer/analyzer.rb b/lib/apk_analyzer/analyzer.rb
index 6bf852e..c10aec4 100644
--- a/lib/apk_analyzer/analyzer.rb
+++ b/lib/apk_analyzer/analyzer.rb
@@ -68,7 +68,8 @@ def collect_manifest_info
     
     # Certificate info. Issuer and dates
     def collect_cert_info
-      raise 'keytool dependency not satisfied. Make sure that JAVA keytool utility is installed' if `which keytool` == ''
+      os_has_keytool = system('keytool')
+      raise 'keytool dependency not satisfied. Make sure that JAVA keytool utility is installed' unless os_has_keytool
       cert_info = {}
       certificate_raw = `keytool -printcert -rfc -jarfile #{@apk_path.shellescape}`
       certificate_content_regexp = /(-----BEGIN CERTIFICATE-----.*-----END CERTIFICATE-----)/m
diff --git a/lib/apk_analyzer/version.rb b/lib/apk_analyzer/version.rb
index 7bcefb3..b291999 100644
--- a/lib/apk_analyzer/version.rb
+++ b/lib/apk_analyzer/version.rb
@@ -1,3 +1,3 @@
 module ApkAnalyzer
-  VERSION = "1.0.0"
+  VERSION = '1.0.1'
 end