minor fix [skip ci]

sp-nitech · Dec 14, 2021 · bb48289 · bb48289
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commit bb48289
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -17,7 +17,6 @@ For the development of SPTK, you may need to install the following programs:
 - [flex](https://github.com/westes/flex/releases) 2.6.3
 - Python 3.6+
 - Valgrind
-- Virtualenv
 
 Then you can setup the development environment of SPTK by running
 ```sh

diff --git a/tools/test_requirements.txt b/tools/test_requirements.txt
@@ -1,5 +1,6 @@
 black
 breathe
+docutils>=0.14,<0.18
 flake8
 isort
 sphinx