diff --git a/ruby/Gemfile.lock b/ruby/Gemfile.lock
index 14cf9b7..f6a4832 100644
--- a/ruby/Gemfile.lock
+++ b/ruby/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    asciidoctor-kroki (0.8.0)
+    asciidoctor-kroki (0.9.0)
       asciidoctor (~> 2.0)
 
 GEM
diff --git a/ruby/lib/asciidoctor/extensions/asciidoctor_kroki/version.rb b/ruby/lib/asciidoctor/extensions/asciidoctor_kroki/version.rb
index 0c0cab5..0c85f7d 100644
--- a/ruby/lib/asciidoctor/extensions/asciidoctor_kroki/version.rb
+++ b/ruby/lib/asciidoctor/extensions/asciidoctor_kroki/version.rb
@@ -2,6 +2,6 @@
 
 module Asciidoctor
   module AsciidoctorKroki
-    VERSION = '0.8.0'
+    VERSION = '0.9.0'
   end
 end