--- a/testing/mozharness/scripts/release/antivirus.py
+++ b/testing/mozharness/scripts/release/antivirus.py
@@ -75,16 +75,17 @@ class AntivirusScan(BaseScript, Virtuale
     CACHE_DIR = 'cache'
 
     def __init__(self):
         BaseScript.__init__(self,
             config_options=self.config_options,
             require_config_file=False,
             config={
                 "virtualenv_modules": [
+                    "pip==1.5.5",
                     "boto",
                     "redo",
                     "mar",
                 ],
                 "virtualenv_path": "venv",
             },
             all_actions=[
                 "create-virtualenv",

--- a/testing/mozharness/scripts/release/push-candidate-to-releases.py
+++ b/testing/mozharness/scripts/release/push-candidate-to-releases.py
@@ -66,16 +66,17 @@ class ReleasePusher(BaseScript, Virtuale
     ] + virtualenv_config_options
 
     def __init__(self, aws_creds):
         BaseScript.__init__(self,
             config_options=self.config_options,
             require_config_file=False,
             config={
                 "virtualenv_modules": [
+                    "pip==1.5.5",
                     "boto",
                     "redo",
                 ],
                 "virtualenv_path": "venv",
             },
             all_actions=[
                 "create-virtualenv",
                 "activate-virtualenv",