diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 0000000..6ebad14
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+3.1.2
\ No newline at end of file
diff --git a/lib/lesson.rb b/lib/lesson.rb
index 28a82cf..811a055 100644
--- a/lib/lesson.rb
+++ b/lib/lesson.rb
@@ -54,7 +54,7 @@ class Lesson
     duration, comment = current_lesson_step
     respond "#{duration} minutes to #{comment}"
 
-    self.current_lesson_step_job_id = scheduler.in "#{duration}s" do
+    self.current_lesson_step_job_id = scheduler.in "#{duration}m" do
       if current_lesson_step_index == lesson_plan.length - 1
         end_lesson
       else