diff --git a/lib/lib_display/esp-epaper-29-ws-20171230-gemu-1.1/docs/requirements.txt b/lib/lib_display/esp-epaper-29-ws-20171230-gemu-1.1/docs/requirements.txt
index 642f0147fe..e062a1d32b 100644
--- a/lib/lib_display/esp-epaper-29-ws-20171230-gemu-1.1/docs/requirements.txt
+++ b/lib/lib_display/esp-epaper-29-ws-20171230-gemu-1.1/docs/requirements.txt
@@ -4,3 +4,4 @@
 sphinx==1.6.5
 sphinx-rtd-theme
 breathe==4.7.3
+pygments>=2.7.4 # not directly required, pinned by Snyk to avoid a vulnerability