diff --git a/tempest/api/identity/v2/test_users.py b/tempest/api/identity/v2/test_users.py
index 4833f9e..33d212c 100644
--- a/tempest/api/identity/v2/test_users.py
+++ b/tempest/api/identity/v2/test_users.py
@@ -44,6 +44,11 @@
             # Clear auth restores the original credentials and deletes
             # cached auth data
             client.auth_provider.clear_auth()
+            # NOTE(lbragstad): Fernet tokens are not subsecond aware and
+            # Keystone should only be precise to the second. Sleep to ensure we
+            # are passing the second boundary before attempting to
+            # authenticate.
+            time.sleep(1)
             client.auth_provider.set_auth()
 
         old_pass = self.creds.password
diff --git a/tempest/api/identity/v3/test_users.py b/tempest/api/identity/v3/test_users.py
index c92e750..1a38f3a 100644
--- a/tempest/api/identity/v3/test_users.py
+++ b/tempest/api/identity/v3/test_users.py
@@ -44,6 +44,11 @@
             # Clear auth restores the original credentials and deletes
             # cached auth data
             client.auth_provider.clear_auth()
+            # NOTE(lbragstad): Fernet tokens are not subsecond aware and
+            # Keystone should only be precise to the second. Sleep to ensure we
+            # are passing the second boundary before attempting to
+            # authenticate.
+            time.sleep(1)
             client.auth_provider.set_auth()
 
         old_pass = self.creds.password