diff --git a/.devcontainer.json b/.devcontainer.json
index 7da7a9c..482ab94 100644
--- a/.devcontainer.json
+++ b/.devcontainer.json
@@ -1,13 +1,14 @@
-// <!-- Managed automatically by PreTeXt authoring tools -->
-// (delete the above line to manage this file manually)
+// This file was automatically generated with PreTeXt 2.12.0.
+// If you modify this file, PreTeXt will no longer automatically update it.
+//
 //////////////////////////////////////////////////////////////
 //
-// This file provides configuration options so that a PreTeXt 
+// This file provides configuration options so that a PreTeXt
 //   project can be edited and built using GitHub's Codespaces.
 // It is recommended to keep this in your repository even if you
-//   do not use this feature, as it will allow other to explore 
-//   your project easily.   
-// This file will be automatically generated by PreTeXt with the 
+//   do not use this feature, as it will allow other to explore
+//   your project easily.
+// This file will be automatically generated by PreTeXt with the
 //   latest updates unless you remove the first comment line above.
 //
 ///////////////////////////////////////////////////////////////
diff --git a/.github/workflows/pretext-cli.yml b/.github/workflows/pretext-cli.yml
index 2be6660..ba19688 100644
--- a/.github/workflows/pretext-cli.yml
+++ b/.github/workflows/pretext-cli.yml
@@ -1,6 +1,6 @@
-# <!-- Managed automatically by PreTeXt authoring tools -->
-# (delete the above line to manage this file manually)
-
+# This file was automatically generated with PreTeXt 2.12.0.
+# If you modify this file, PreTeXt will no longer automatically update it.
+#
 name: PreTeXt-CLI Actions
 on:
     # Runs on pull requests
diff --git a/.gitignore b/.gitignore
index 0096a4e..85c42c7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
-# <!-- Managed automatically by PreTeXt authoring tools -->
-# (delete the above line to manage this file manually)
-
+# This file was automatically generated with PreTeXt 2.12.0.
+# If you modify this file, PreTeXt will no longer automatically update it.
+#
 # Boilerplate list of files in a PreTeXt project for git to ignore
 # ensure this file is tracked
 !.gitignore
@@ -90,6 +90,8 @@ bh_unicode_properties.cache
 # https://packagecontrol.io/packages/sublime-github
 GitHub.sublime-settings
 
+# Don't track common virtual environment directories
+venv/
 
 # Don't include Dropbox settings and caches
 .dropbox
diff --git a/project.ptx b/project.ptx
index ea7a74e..9aadae0 100644
--- a/project.ptx
+++ b/project.ptx
@@ -1,4 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!-- This file was automatically generated by PreTeXt 2.12.0. -->
+<!-- If you modify this file, PreTeXt will no longer automatically update it.-->
+
 <!-- This file, the project manifest, provides the overall configuration for your PreTeXt project. To edit the content of your document, open `source/main.ptx`. See https://pretextbook.org/doc/guide/html/processing-CLI.html#cli-project-manifest. -->
 <project ptx-version="2">
   <targets>
diff --git a/requirements.txt b/requirements.txt
index 7de8c82..f553660 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-# <!-- Managed automatically by PreTeXt authoring tools -->
-pretext == 2.11.4
+# This file was automatically generated with PreTeXt 2.12.0.
+pretext == 2.12.0