--- a/testing/mozharness/mozharness/base/python.py
+++ b/testing/mozharness/mozharness/base/python.py
@@ -152,17 +152,19 @@ class VirtualenvMixin(object):
         packages = {}
 
         if pip_freeze_output is None:
             # get the output from `pip freeze`
             pip = self.query_python_path("pip")
             if not pip:
                 self.log("package_versions: Program pip not in path", level=error_level)
                 return {}
-            pip_freeze_output = self.get_output_from_command([pip, "freeze"], silent=True)
+            pip_freeze_output = self.get_output_from_command(
+                [pip, "--disable-pip-version-check", "freeze"], silent=True
+            )
             if not isinstance(pip_freeze_output, basestring):
                 self.fatal("package_versions: Error encountered running `pip freeze`: %s" % pip_freeze_output)
 
         for line in pip_freeze_output.splitlines():
             # parse the output into package, version
             line = line.strip()
             if not line:
                 # whitespace