diff --git a/app/controllers/proposals_controller.rb b/app/controllers/proposals_controller.rb
index 3a63d3c5d..294c36307 100644
--- a/app/controllers/proposals_controller.rb
+++ b/app/controllers/proposals_controller.rb
@@ -109,6 +109,7 @@ def edit
   def update
     if params[:confirm]
       @proposal.update(confirmed_at: Time.current)
+      @proposal.sync_program_session
       redirect_to event_event_proposals_url(slug: @event.slug, uuid: @proposal), flash: { success: "Thank you for confirming your participation" }
     elsif @proposal.speaker_update_and_notify(proposal_params)
       redirect_to event_proposal_url(event_slug: @event.slug, uuid: @proposal)
diff --git a/app/models/proposal.rb b/app/models/proposal.rb
index b29f09575..ae9a49516 100644
--- a/app/models/proposal.rb
+++ b/app/models/proposal.rb
@@ -242,6 +242,7 @@ def speaker_update_and_notify(attributes)
     old_title = title
     speaker_updates = attributes.merge({ updated_by_speaker_at: Time.current })
     if update(speaker_updates)
+      sync_program_session
       field_names = last_change.join(', ')
       reviewers.each do |reviewer|
         Notification.create_for(reviewer, proposal: self,
@@ -282,6 +283,16 @@ def update_tags(old, new, internal)
     taggings.create(tags)
   end
 
+  # When a speaker makes minor changes to their submitted proposal (such as fixing a typo),
+  # the associated program_session becomes outdated. Consequently, the program.json also becomes outdated.
+  # Strictly, organizers should prohibit speakers from editing their submitted proposals directly.
+  # However, for practical reasons, we allow modifications by speakers.
+  def sync_program_session
+    if program_session.present?
+      program_session.update!(title: title, abstract: abstract)
+    end
+  end
+
   def has_public_reviewer_comments?
     public_comments.reject { |comment| speakers.include?(comment.user_id) }.any?
   end
diff --git a/spec/controllers/proposals_controller_spec.rb b/spec/controllers/proposals_controller_spec.rb
index b5c681d1d..fee48539f 100644
--- a/spec/controllers/proposals_controller_spec.rb
+++ b/spec/controllers/proposals_controller_spec.rb
@@ -162,5 +162,26 @@
                       pitch: 'new_pitch' }}
       }.to change { Notification.count }.by(1)
     end
+
+    context "when the proposal approved (has program_session)" do
+      let!(:program_session) { create(:program_session, proposal: proposal, track: proposal.track, speakers: [speaker]) }
+
+      before do
+        proposal.update(title: 'orig_title', abstract: "orig_abst", pitch: 'orig_pitch')
+        program_session.update(title: 'orig_title', abstract: "orig_abst")
+      end
+
+      it "updates the program_session attributes also" do
+        put :update, params: {event_slug: proposal.event.slug, uuid: proposal,
+          proposal: { title: 'new_title', abstract: 'new_abst', pitch: 'new_pitch' }}
+
+      proposal.reload
+      program_session.reload
+      expect(proposal.title).to eq('new_title')
+      expect(proposal.pitch).to eq('new_pitch')
+      expect(program_session.title).to eq('new_title')
+      expect(program_session.abstract).to eq('new_abst')
+      end
+    end
   end
 end