diff --git a/lib/katakata_irb/type_analyzer.rb b/lib/katakata_irb/type_analyzer.rb
index 370e4e4..ed6c288 100644
--- a/lib/katakata_irb/type_analyzer.rb
+++ b/lib/katakata_irb/type_analyzer.rb
@@ -918,10 +918,12 @@ def assign_parameters(node, scope, args, kwargs)
       scope[node.rest.name.to_s] = KatakataIrb::Types.array_of(*rest)
     end
     node.keywords.each do |n|
-      # n is Prism::KeywordParameterNode
+      # n is Prism::KeywordParameterNode (prism = 0.16.0)
+      # n is Prism::RequiredKeywordParameterNode | Prism::OptionalKeywordParameterNode (prism > 0.16.0)
       name = n.name.to_s.delete(':')
       values = [kwargs.delete(name)]
-      values << evaluate(n.value, scope) if n.value
+      # `respond_to?` is for prism > 0.16.0, `&& n.value` is for prism = 0.16.0
+      values << evaluate(n.value, scope) if n.respond_to?(:value) && n.value
       scope[name] = KatakataIrb::Types::UnionType[*values.compact]
     end
     # node.keyword_rest is Prism::KeywordRestParameterNode or Prism::ForwardingParameterNode or Prism::NoKeywordsParameterNode
diff --git a/test/test_katakata_irb.rb b/test/test_katakata_irb.rb
index 52f889d..659d7db 100644
--- a/test/test_katakata_irb.rb
+++ b/test/test_katakata_irb.rb
@@ -60,8 +60,10 @@ def test_prism_node_names
     ignore_class_names = [
       # Not traversed
       'Prism::BlockLocalVariableNode',
-      # Removed in prism > 0.15.1
-      'Prism::RequiredDestructuredParameterNode'
+      # Removed in prism > 0.16.0
+      'Prism::KeywordParameterNode',
+      # Added in prism > 0.16.0
+      'Prism::OptionalKeywordParameterNode', 'Prism::RequiredKeywordParameterNode'
     ]
     implemented_node_class_names = [
       *codes.join.scan(/evaluate_[a-z_]+/).grep(/_node$/).map { "Prism::#{_1[9..].split('_').map(&:capitalize).join}" },