diff --git a/lib/active_record/type/spanner/time.rb b/lib/active_record/type/spanner/time.rb
index e47fa97d..b326250a 100644
--- a/lib/active_record/type/spanner/time.rb
+++ b/lib/active_record/type/spanner/time.rb
@@ -9,7 +9,7 @@
 module ActiveRecord
   module Type
     module Spanner
-      class Time < ActiveRecord::Type::Time
+      class Time < ActiveRecord::Type::DateTime
         def serialize_with_isolation_level value, isolation_level
           if value == :commit_timestamp
             return "PENDING_COMMIT_TIMESTAMP()" if isolation_level == :dml