diff --git a/lib/typesense/synonym_set.rb b/lib/typesense/synonym_set.rb
index b28cbea..da93395 100644
--- a/lib/typesense/synonym_set.rb
+++ b/lib/typesense/synonym_set.rb
@@ -7,6 +7,10 @@ def initialize(synonym_set_name, api_call)
       @api_call = api_call
     end
 
+    def upsert(params)
+      @api_call.put(endpoint_path, params)
+    end
+
     def retrieve
       @api_call.get(endpoint_path)
     end
diff --git a/spec/typesense/synonym_set_spec.rb b/spec/typesense/synonym_set_spec.rb
index e4e1efe..751e4c0 100644
--- a/spec/typesense/synonym_set_spec.rb
+++ b/spec/typesense/synonym_set_spec.rb
@@ -46,6 +46,16 @@
     # Ignore errors if already deleted
   end
 
+  describe '#upsert' do
+    it 'creates a synonym set and returns it' do
+      skip('SynonymSets is only supported in Typesense v30+') unless typesense_v30_or_above?
+
+      result = synonym_set.upsert(synonym_set_data)
+
+      expect(result['items']).to eq(synonym_set_data['items'])
+    end
+  end
+
   describe '#retrieve' do
     it 'returns the specified synonym set' do
       skip('SynonymSets is only supported in Typesense v30+') unless typesense_v30_or_above?