diff --git a/requirements/lck/docs.txt b/requirements/lck/docs.txt
index a9881b1..f26075c 100644
--- a/requirements/lck/docs.txt
+++ b/requirements/lck/docs.txt
@@ -26,7 +26,7 @@ pybtex==0.21              # via pybtex-docutils, sphinxcontrib-bibtex
 Pygments==2.2.0           # via sphinx
 pyparsing==2.1.10         # via packaging
 pytz==2016.10             # via babel
-PyYAML==3.12              # via pybtex
+PyYAML==5.4              # via pybtex
 requests==2.13.0          # via consulate, sphinx
 six==1.10.0               # via attrdict, latexcodec, packaging, pockets, pybtex-docutils, setuptools, sphinx, sphinxcontrib-bibtex, sphinxcontrib-napoleon, stevedore
 snowballstemmer==1.2.1    # via sphinx