diff --git a/requirements.txt b/requirements.txt
index 695dd323..1455988c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,13 +1,12 @@
 Sphinx
 sphinx_rtd_theme
+sphinx_rtd_theme_ext_color_contrast
 myst_nb
-sphinx-copybutton
 sphinx-lesson
 https://github.com/aaltoscicomp/sphinx-aaltoscicomp-branding/archive/master.zip
-sphinx_rtd_theme_ext_color_contrast
 sphinxext-opengraph
 sphinx-thebe
 
 # for web-apis execution
 jsonlines
-bs4
\ No newline at end of file
+bs4