diff --git a/requirements_dev_optional.txt b/requirements_dev_optional.txt
index ca31d735fc..fc4c5666a3 100644
--- a/requirements_dev_optional.txt
+++ b/requirements_dev_optional.txt
@@ -1,6 +1,6 @@
 # optional library requirements
 # bsddb3==6.2.6; sys_platform != 'win32'
-lmdb==1.6.2; sys_platform != 'win32'
+lmdb==1.7.2; sys_platform != 'win32'
 # optional library requirements for Jupyter
 ipytree==0.2.2
 ipywidgets==8.1.7