diff --git a/lib/metanorma/ribose/isodoc.rng b/lib/metanorma/ribose/isodoc.rng
index 96243b5..7ac8705 100644
--- a/lib/metanorma/ribose/isodoc.rng
+++ b/lib/metanorma/ribose/isodoc.rng
@@ -1285,7 +1285,12 @@
   </define>
   <define name="span">
     <element name="span">
-      <attribute name="class"/>
+      <optional>
+        <attribute name="class"/>
+      </optional>
+      <optional>
+        <attribute name="style"/>
+      </optional>
       <oneOrMore>
         <ref name="TextElement"/>
       </oneOrMore>
diff --git a/lib/metanorma/ribose/reqt.rng b/lib/metanorma/ribose/reqt.rng
index 886de75..854067c 100644
--- a/lib/metanorma/ribose/reqt.rng
+++ b/lib/metanorma/ribose/reqt.rng
@@ -108,7 +108,7 @@
     </element>
   </define>
   <define name="label">
-    <element name="label">
+    <element name="identifier">
       <oneOrMore>
         <ref name="TextElement"/>
       </oneOrMore>
diff --git a/lib/metanorma/ribose/version.rb b/lib/metanorma/ribose/version.rb
index ec5b91d..8e44a49 100644
--- a/lib/metanorma/ribose/version.rb
+++ b/lib/metanorma/ribose/version.rb
@@ -1,5 +1,5 @@
 module Metanorma
   module Ribose
-    VERSION = "2.1.5".freeze
+    VERSION = "2.1.6".freeze
   end
 end
diff --git a/metanorma-ribose.gemspec b/metanorma-ribose.gemspec
index 1de5853..653d9d1 100644
--- a/metanorma-ribose.gemspec
+++ b/metanorma-ribose.gemspec
@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
   spec.required_ruby_version = Gem::Requirement.new(">= 2.5.0")
 
-  spec.add_dependency "metanorma-generic", "~> 2.1.1"
+  spec.add_dependency "metanorma-generic", "~> 2.2.0"
 
   spec.add_development_dependency "debug"
   spec.add_development_dependency "equivalent-xml", "~> 0.6"