diff --git a/contrib/ruby/lib/trilogy.rb b/contrib/ruby/lib/trilogy.rb
index bde8a033..cee8b673 100644
--- a/contrib/ruby/lib/trilogy.rb
+++ b/contrib/ruby/lib/trilogy.rb
@@ -7,7 +7,18 @@
 require "trilogy/encoding"
 
 class Trilogy
+  VALID_OPTIONS = %i[
+    host port path database username password encoding
+    ssl ssl_mode ssl_cipher ssl_ca ssl_capath ssl_key ssl_cert
+    tls_min_version tls_max_version tls_ciphersuites
+    read_timeout write_timeout connect_timeout
+    multi_statement
+  ].freeze
+
   def initialize(options = {})
+    invalid_keys = options.keys - VALID_OPTIONS
+    $stderr.puts "[WARNING] Unknown Trilogy options: #{invalid_keys.map(&:inspect).join(", ")}" unless invalid_keys.empty?
+
     options[:port] = options[:port].to_i if options[:port]
     mysql_encoding = options[:encoding] || "utf8mb4"
     encoding = Trilogy::Encoding.find(mysql_encoding)
diff --git a/contrib/ruby/test/client_test.rb b/contrib/ruby/test/client_test.rb
index 269e2269..0874e382 100644
--- a/contrib/ruby/test/client_test.rb
+++ b/contrib/ruby/test/client_test.rb
@@ -71,6 +71,8 @@ def test_trilogy_connection_options
       tls_min_version: 3,
     }
     assert_equal expected_connection_options, client.connection_options
+
+    assert_output('', /\[WARNING\] Unknown Trilogy options: :foo, "bar"/) {  new_tcp_client({ foo: "", "bar" => "" }) }
   end
 
   def test_trilogy_ping