diff --git a/lib/relaton_iso_bib.rb b/lib/relaton_iso_bib.rb
index 6c3564c..a5f0771 100644
--- a/lib/relaton_iso_bib.rb
+++ b/lib/relaton_iso_bib.rb
@@ -13,9 +13,9 @@ class Error < StandardError; end
   # Returns hash of XML reammar
   # @return [String]
   def self.grammar_hash
-    gem_path = File.expand_path "..", __dir__
-    grammars_path = File.join gem_path, "grammars", "*"
-    grammars = Dir[grammars_path].sort.map { |gp| File.read gp, encoding: "UTF-8" }.join
-    Digest::MD5.hexdigest grammars
+    # gem_path = File.expand_path "..", __dir__
+    # grammars_path = File.join gem_path, "grammars", "*"
+    # grammars = Dir[grammars_path].sort.map { |gp| File.read gp, encoding: "UTF-8" }.join
+    Digest::MD5.hexdigest RelatonIsoBib::VERSION + RelatonBib::VERSION # grammars
   end
 end
diff --git a/lib/relaton_iso_bib/version.rb b/lib/relaton_iso_bib/version.rb
index 76b6ff6..604b0d3 100644
--- a/lib/relaton_iso_bib/version.rb
+++ b/lib/relaton_iso_bib/version.rb
@@ -1,3 +1,3 @@
 module RelatonIsoBib
-  VERSION = "1.16.0".freeze
+  VERSION = "1.16.1".freeze
 end