diff --git a/temporalio/.tool-versions b/temporalio/.tool-versions
deleted file mode 100644
index 9f00cc14..00000000
--- a/temporalio/.tool-versions
+++ /dev/null
@@ -1 +0,0 @@
-ruby 3.3.7
diff --git a/temporalio/lib/temporalio/internal/worker/workflow_instance.rb b/temporalio/lib/temporalio/internal/worker/workflow_instance.rb
index 0fb5399b..abce7c91 100644
--- a/temporalio/lib/temporalio/internal/worker/workflow_instance.rb
+++ b/temporalio/lib/temporalio/internal/worker/workflow_instance.rb
@@ -149,7 +149,7 @@ def initialize(details)
                     end,
               run_id: details.initial_activation.run_id,
               run_timeout: ProtoUtils.duration_to_seconds(@init_job.workflow_run_timeout),
-              start_time: ProtoUtils.timestamp_to_time(details.initial_activation.timestamp) || raise,
+              start_time: ProtoUtils.timestamp_to_time(@init_job.start_time) || raise,
               task_queue: details.task_queue,
               task_timeout: ProtoUtils.duration_to_seconds(@init_job.workflow_task_timeout) || raise,
               workflow_id: @init_job.workflow_id,
diff --git a/temporalio/lib/temporalio/workflow/info.rb b/temporalio/lib/temporalio/workflow/info.rb
index ea68caa5..2bc7a29f 100644
--- a/temporalio/lib/temporalio/workflow/info.rb
+++ b/temporalio/lib/temporalio/workflow/info.rb
@@ -54,7 +54,7 @@ module Workflow
     # @!attribute run_timeout
     #   @return [Float, nil] Run timeout for the workflow.
     # @!attribute start_time
-    #   @return [Time] Time when the workflow started.
+    #   @return [Time] Time when the workflow started on the server.
     # @!attribute task_queue
     #   @return [String] Task queue for the workflow.
     # @!attribute task_timeout
diff --git a/temporalio/test/worker_workflow_test.rb b/temporalio/test/worker_workflow_test.rb
index f24a25f9..487806b4 100644
--- a/temporalio/test/worker_workflow_test.rb
+++ b/temporalio/test/worker_workflow_test.rb
@@ -144,6 +144,7 @@ def execute
       Temporalio::Workflow.info.to_h.tap do |h|
         h['parent'] = Temporalio::Workflow.info.parent.to_h if Temporalio::Workflow.info.parent
         h['root'] = Temporalio::Workflow.info.root.to_h if Temporalio::Workflow.info.root
+        h['start_time'] = Temporalio::Workflow.info.start_time.to_s
       end
     end
   end
@@ -158,6 +159,7 @@ def test_info
     # Normal info
     execute_workflow(InfoWorkflow) do |handle, worker|
       info = handle.result #: Hash[String, untyped]
+      desc = handle.describe
       assert_equal 1, info['attempt']
       assert_nil info.fetch('continued_run_id')
       assert_nil info.fetch('cron_schedule')
@@ -170,7 +172,7 @@ def test_info
       assert_nil info.fetch('root')
       assert_equal handle.result_run_id, info['run_id']
       assert_nil info.fetch('run_timeout')
-      refute_nil info['start_time']
+      assert_equal desc.start_time.to_s, info['start_time']
       assert_equal worker.task_queue, info['task_queue']
       assert_equal 10.0, info['task_timeout']
       assert_equal handle.id, info['workflow_id']