diff --git a/example_code/chapter_20/learning_log_django_2.0/requirements.txt b/example_code/chapter_20/learning_log_django_2.0/requirements.txt
index cc74e62..af8ce57 100644
--- a/example_code/chapter_20/learning_log_django_2.0/requirements.txt
+++ b/example_code/chapter_20/learning_log_django_2.0/requirements.txt
@@ -1,6 +1,6 @@
 dj-database-url==0.4.2
 dj-static==0.0.6
-Django==1.11.28
+Django==1.11.29
 django-bootstrap3==9.1.0
 gunicorn==19.5.0
 psycopg2==2.7.3.2
diff --git a/example_code/chapter_20/learning_log_django_2.1/requirements.txt b/example_code/chapter_20/learning_log_django_2.1/requirements.txt
index a590792..75cff37 100644
--- a/example_code/chapter_20/learning_log_django_2.1/requirements.txt
+++ b/example_code/chapter_20/learning_log_django_2.1/requirements.txt
@@ -1,6 +1,6 @@
 dj-database-url==0.5.0
 dj-static==0.0.6
-Django==3.0.7
+Django==1.11.29
 django-bootstrap3==10.0.1
 gunicorn==19.5.0
 psycopg2==2.7.5
diff --git a/example_code/chapter_20/requirements.txt b/example_code/chapter_20/requirements.txt
index a3b6978..d95eb78 100644
--- a/example_code/chapter_20/requirements.txt
+++ b/example_code/chapter_20/requirements.txt
@@ -1,4 +1,4 @@
-Django==1.11.23
+Django==1.11.29
 dj-database-url==0.3.0
 dj-static==0.0.6
 django-bootstrap3==6.2.2