diff --git a/hapi/hapi.py b/hapi/hapi.py
index 3b8be0b..e97cd42 100644
--- a/hapi/hapi.py
+++ b/hapi/hapi.py
@@ -37,6 +37,8 @@
 from warnings import warn,simplefilter
 from time import time
 import pydoc
+import ssl
+import certifi
 
 # Enable warning repetitions
 simplefilter('always', UserWarning)
@@ -94,7 +96,7 @@ def open_(*args,**argv):
 'ADDED CALCULATION OF THE ISO_ID TABLE ON STARTUP (ver. 1.2.1.0)',
 'ADDED SUPPORT FOR TIPS-2021 (ver. 1.2.2.0)',
 'FIXED BUG WITH WAVENUMBERGRID (ver. 1.2.2.1)',
-]
+]
 
 # version header
 print('HAPI version: %s' % HAPI_VERSION)
@@ -2855,7 +2857,7 @@ def queryHITRAN(TableName,iso_id_list,numin,numax,pargroups=[],params=[],dotpar=
             proxy = urllib2.ProxyHandler(VARIABLES['PROXY'])
             opener = urllib2.build_opener(proxy)
             urllib2.install_opener(opener)            
-        req = urllib2.urlopen(url)
+        req = urllib2.urlopen(url, context=ssl.create_default_context(cafile=certifi.where()))
     except urllib2.HTTPError:
         raise Exception('Failed to retrieve data for given parameters.')
     except urllib2.URLError: