diff --git a/modules/costs/app/components/time_entries/time_entry_form_component.rb b/modules/costs/app/components/time_entries/time_entry_form_component.rb
index 887e712496cc..648b155980cc 100644
--- a/modules/costs/app/components/time_entries/time_entry_form_component.rb
+++ b/modules/costs/app/components/time_entries/time_entry_form_component.rb
@@ -54,7 +54,7 @@ def form_options
       if time_entry.persisted?
         base.merge({
                      url: project_time_entry_path(project, time_entry),
-                     method: :post
+                     method: :patch
                    })
       else
 
diff --git a/modules/costs/app/contracts/time_entries/base_contract.rb b/modules/costs/app/contracts/time_entries/base_contract.rb
index 52aad1fda5db..1d9fdcf5aa63 100644
--- a/modules/costs/app/contracts/time_entries/base_contract.rb
+++ b/modules/costs/app/contracts/time_entries/base_contract.rb
@@ -69,6 +69,8 @@ def self.model
     attribute :user_id,
               permission: :log_time
 
+    attribute :start_time # TODO: Add validation with global setting
+
     def assignable_activities
       if model.project
         TimeEntryActivity.active_in_project(model.project)
diff --git a/modules/costs/app/controllers/projects/time_entries_controller.rb b/modules/costs/app/controllers/projects/time_entries_controller.rb
index 3a5edf3e536c..7cd85daa8694 100644
--- a/modules/costs/app/controllers/projects/time_entries_controller.rb
+++ b/modules/costs/app/controllers/projects/time_entries_controller.rb
@@ -63,9 +63,22 @@ def create
     end
 
     def update
-      puts "*" * 100
-      pp(permitted_params.time_entries)
-      puts "*" * 100
+      time_entry = TimeEntry.find_by(id: params[:id])
+
+      call = TimeEntries::UpdateService
+        .new(user: current_user, model: time_entry)
+        .call(time_entry_params)
+
+      @time_entry = call.result
+
+      if call.success?
+      # TODO: just close here?
+      else
+        form_component = TimeEntries::TimeEntryFormComponent.new(time_entry: @time_entry)
+        update_via_turbo_stream(component: form_component, status: :bad_request)
+
+        respond_with_turbo_streams
+      end
     end
 
     private