diff --git a/docs/02-manual-operations.md b/docs/02-manual-operations.md
index 318b291..9ab8af5 100644
--- a/docs/02-manual-operations.md
+++ b/docs/02-manual-operations.md
@@ -109,8 +109,8 @@ $ sudo bundle install
 Install MongoDB which your application uses:
 
 ```bash
-$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv EA312927
-$ echo "deb http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list
+$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv E52529D4
+$ sudo bash -c 'echo "deb http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/4.0 multiverse" > /etc/apt/sources.list.d/mongodb-org-4.0.list'
 $ sudo apt-get update
 $ sudo apt-get install -y mongodb-org
 ```
diff --git a/docs/03-scripts.md b/docs/03-scripts.md
index e53a828..87a8da0 100644
--- a/docs/03-scripts.md
+++ b/docs/03-scripts.md
@@ -66,8 +66,8 @@ apt-get install -y ruby-full build-essential
 gem install --no-rdoc --no-ri bundler
 
 echo "  ----- install mongodb -----  "
-apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv EA312927
-echo "deb http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.2 multiverse" > /etc/apt/sources.list.d/mongodb-org-3.2.list
+sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv E52529D4
+sudo bash -c 'echo "deb http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/4.0 multiverse" > /etc/apt/sources.list.d/mongodb-org-4.0.list'
 apt-get update
 apt-get install -y mongodb-org