diff --git a/docs/requirements.txt b/docs/requirements.txt
index 3020b94..6485beb 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,6 +1,6 @@
 sphinx-book-theme~=0.1
 numpydoc~=1.1
-sphinx-copybutton~=0.4
+sphinx-copybutton~=0.5
 sphinxcontrib-bibtex~=2.4
 # nupack -f https://github.com/beliveau-lab/NUPACK/blob/master/src/package/nupack-4.0.0.23-cp38-cp38-macosx_10_13_x86_64.whl; sys_platform == "darwin"
 # nupack -f https://github.com/beliveau-lab/NUPACK/blob/master/src/package/nupack-4.0.0.23-cp38-cp38-manylinux2014_x86_64.whl; sys_platform == "linux"