diff --git a/rattail_harvest/harvest/webapi.py b/rattail_harvest/harvest/webapi.py
index a037f1b..76036a6 100644
--- a/rattail_harvest/harvest/webapi.py
+++ b/rattail_harvest/harvest/webapi.py
@@ -58,6 +58,9 @@ class HarvestWebAPI(object):
         elif request_method == 'POST':
             response = requests.post('{}/{}'.format(self.base_url, api_method),
                                      headers=headers, params=params)
+        elif request_method == 'PATCH':
+            response = requests.patch('{}/{}'.format(self.base_url, api_method),
+                                      headers=headers, params=params)
         else:
             raise NotImplementedError("unknown request method: {}".format(
                 request_method))
@@ -76,6 +79,12 @@ class HarvestWebAPI(object):
         """
         return self._request('POST', api_method, params=params)
 
+    def patch(self, api_method, params=None):
+        """
+        Perform a PATCH request for the given API method, and return the response.
+        """
+        return self._request('PATCH', api_method, params=params)
+
     def get_company(self):
         """
         Retrieves the company for the currently authenticated user.
@@ -168,6 +177,15 @@ class HarvestWebAPI(object):
         response = self.post('/time_entries', params=kwargs)
         return response.json()
 
+    def stop_time_entry(self, time_entry_id):
+        """
+        Stop a running time entry.
+
+        https://help.getharvest.com/api-v2/timesheets-api/timesheets/time-entries/#stop-a-running-time-entry
+        """
+        response = self.patch('/time_entries/{}/stop'.format(time_entry_id))
+        return response.json()
+
 
 def make_harvest_webapi(config):
     access_token = config.require('harvest', 'api.access_token')