diff --git a/lib/lev/routine.rb b/lib/lev/routine.rb
index 80dccad..ffe1f6b 100644
--- a/lib/lev/routine.rb
+++ b/lib/lev/routine.rb
@@ -495,7 +495,8 @@ def runner=(runner)
     def in_transaction(options={})
       if transaction_run_by?(self)
         isolation_symbol = self.class.transaction_isolation.symbol
-        if ActiveRecord::VERSION::MAJOR >= 7 && ActiveRecord::VERSION::MINOR >= 1 &&
+        if (ActiveRecord::VERSION::MAJOR >= 8 ||
+            (ActiveRecord::VERSION::MAJOR == 7 && ActiveRecord::VERSION::MINOR >= 1)) &&
            ActiveRecord::Base.connection.transaction_open?
           # Don't even try to set transaction isolation if the transaction is already open
           ActiveRecord::Base.transaction do