HyukjinKwon commented on a change in pull request #27534: [SPARK-30731][DOCS] 
Refine workflow for building docs
URL: https://github.com/apache/spark/pull/27534#discussion_r377394628
 
 

 ##########
 File path: docs/README.md
 ##########
 @@ -58,7 +84,7 @@ Note: Other versions of roxygen2 might work in SparkR 
documentation generation b
 To generate API docs for any language, you'll need to install these libraries:
 
 ```sh
-$ sudo pip install sphinx mkdocs numpy
+pip install sphinx==2.3.1 mkdocs==1.0.4 numpy==1.18.1
 
 Review comment:
   @nchammas, btw why should we fix the version? I think it's better to promote 
the latest versions.

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