diff --git a/INSTALL.md b/INSTALL.md
index 92c266d8..540fba4e 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -1,6 +1,18 @@
 ```
-npm install -g gitbook-cli
-gitbook serve
+# install honkit
+npm install honkit --save-dev
+
+# show website running locally
+npx honkit serve
+
+# generate website files
+npx honkit build . public --log=debug
+
+# generate pdf
+npx honkit pdf . byte-of-python.pdf
+
+# generate epub
+npx honkit epub . byte-of-python.epub
 ```
 
-See http://toolchain.gitbook.com/ebook.html
+See https://github.com/honkit/honkit and https://honkit.netlify.app/
diff --git a/Makefile b/Makefile
index cc6bc1f8..7e3fc8b6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
-# https://toolchain.gitbook.com/setup.html
+# https://github.com/honkit/honkit
 setup:
-	npm install gitbook-cli -g
+	npm install honkit --save-dev
 
 serve:
-	gitbook serve
+	npx honkit serve
diff --git a/about.md b/about.md
index 19ecf32c..b3d5024c 100644
--- a/about.md
+++ b/about.md
@@ -30,6 +30,8 @@ For the ninth draft, I switched to [AsciiDoc format](http://asciidoctor.org/docs
 
 For the tenth draft, I switched to writing in Markdown + [GitBook](https://www.gitbook.com) format, using the [Spacemacs editor](http://spacemacs.org).
 
+Nov 2020: Since Gitbook abandoned their open source software, migrated to [Honkit, a community-maintained fork of Gitbook legacy](https://github.com/honkit/honkit).
+
 ## About the Author
 
 See {{ book.authorUrl }}
diff --git a/revision_history.md b/revision_history.md
index bb0e840d..f65270f8 100644
--- a/revision_history.md
+++ b/revision_history.md
@@ -16,6 +16,10 @@ The book needs the help of its readers such as yourselves to point out any parts
 
 # Appendix: Revision History {#revision-history}
 
+- No version change
+    - 06 Nov 2020
+    - Migrated from abandoned GitBook to [community-maintained Honkit, a fork of GitBook legacy](https://github.com/honkit/honkit)
+
 - 4.0
     - 19 Jan 2016
     - Switched back to Python 3
diff --git a/translation_howto.md b/translation_howto.md
index 0cda1569..b67207c1 100644
--- a/translation_howto.md
+++ b/translation_howto.md
@@ -3,6 +3,6 @@
 1. The full source of the book is available from {{ book.sourceUrl }}.
 2. Please [fork the repository](https://help.github.com/articles/fork-a-repo).
 3. Then, fetch the repository to your computer. You need to know how to use [Git](http://www.git-scm.com) to do that.
-4. Read the [GitBook documentation](https://docs.gitbook.com), esp. the [Markdown section](https://docs.gitbook.com/editing-content/markdown).
+4. Read the [Honkit documentation](https://honkit.netlify.app), esp. the [Markdown section](https://honkit.netlify.app/syntax/markdown.html).
 5. Start editing the `.md` files to translate to your local language.
-6. [Sign up on GitBook.com](https://www.gitbook.com), create a book and you can see a beautifully rendered website, with links to download PDF, EPUB, etc.
+6. See [INSTALL.md](./INSTALL.md) on how to generate the website, PDF, EPUB.