diff --git a/Lecture5/requirements.txt b/Lecture5/requirements.txt
index 70bab6d..85ef5f3 100644
--- a/Lecture5/requirements.txt
+++ b/Lecture5/requirements.txt
@@ -18,7 +18,7 @@ json5==0.8.5
 jsonschema==3.2.0
 jupyter-client==5.3.4
 jupyter-core==4.6.1
-jupyterlab==1.2.6
+jupyterlab==1.2.21
 jupyterlab-server==1.0.6
 kiwisolver==1.1.0
 MarkupSafe==1.1.1