diff --git a/config/nom_build.py b/config/nom_build.py
index c3112aa97..f7acc5d8f 100644
--- a/config/nom_build.py
+++ b/config/nom_build.py
@@ -16,7 +16,7 @@
 """
 
 import argparse
-import attr
+import dataclasses
 import io
 import os
 import shutil
@@ -25,7 +25,7 @@ import sys
 from typing import List, Union
 
 
-@attr.s(auto_attribs=True)
+@dataclasses.dataclass
 class Property:
     name : str = ''
     desc : str = ''
@@ -39,7 +39,7 @@ class Property:
                 raise ValidationError('value of {self.name} must be "true" or '
                                       '"false".')
 
-@attr.s(auto_attribs=True)
+@dataclasses.dataclass
 class GradleFlag:
     flags : Union[str, List[str]]
     desc : str
diff --git a/docs/install.md b/docs/install.md
index 262bbab2d..5b2134474 100644
--- a/docs/install.md
+++ b/docs/install.md
@@ -11,6 +11,7 @@ You will need the following programs installed on your local machine:
 *   [Google App Engine SDK for Java][app-engine-sdk], and configure aliases to
     to the `gcloud` and `appcfg.sh` utilities (you'll use them a lot).
 *   [Git](https://git-scm.com/) version control system.
+*   Python version 3.7 or newer.
 
 **Note:** App Engine does not yet support Java 9. Also, the instructions in this
 document have only been tested on Linux. They might work with some alterations