diff --git a/CONTRIBUTE.md b/CONTRIBUTE.md
index d2c62da..3bd6f37 100644
--- a/CONTRIBUTE.md
+++ b/CONTRIBUTE.md
@@ -5,6 +5,9 @@ Content's made with an open and commercially friendly license so so that you can
 
 # PDF versions
 
-Download [`RHM v0.3`](https://github.com/vmayoral/robot_hacking_manual/releases/download/0.3/RHM.pdf).
+Download [`RHM v0.4`](https://github.com/vmayoral/robot_hacking_manual/releases/download/0.4/RHM.pdf).
 
-PDF versions are generated for every release. Check out all the releases [here](https://github.com/vmayoral/robot_hacking_manual/releases).
+PDF versions are generated for every release. Check out all the releases [here](https://github.com/vmayoral/robot_hacking_manual/releases):
+
+- [`RHM v0.4`](https://github.com/vmayoral/robot_hacking_manual/releases/download/0.4/RHM.pdf)
+- [`RHM v0.3`](https://github.com/vmayoral/robot_hacking_manual/releases/download/0.3/RHM.pdf)
diff --git a/INDEX.md b/INDEX.md
index f8e922a..99838be 100644
--- a/INDEX.md
+++ b/INDEX.md
@@ -1,7 +1,7 @@
 ---
-title: "**RHM `0.3`**: Robot Hacking Manual"
+title: "**RHM `0.4`**: Robot Hacking Manual"
 author: [Víctor Mayoral-Vilches]
-date: "**version `0.3`** (2021-11-21)"
+date: "**version `0.4`** (2021-12-12)"
 toc: true
 subject: "Markdown"
 keywords: [Robotics, Cybersecurity, Hacking, Pentesting, Offensive]
diff --git a/Makefile b/Makefile
index 43b9b74..f87aca1 100644
--- a/Makefile
+++ b/Makefile
@@ -17,9 +17,9 @@ SOURCE_FILES := $(SOURCE_FILES) \
 				$(CURDIR)/1_case_studies/README.md \
 				$(CURDIR)/1_case_studies/0_cobot/README.md \
 				$(CURDIR)/1_case_studies/1_amr/README.md \
+				$(CURDIR)/1_case_studies/4_ros/README.md \
 				$(CURDIR)/1_case_studies/2_ros2/README.md \
-				$(CURDIR)/1_case_studies/3_turtlebot3/README.md \
-				$(CURDIR)/1_case_studies/4_ros/README.md				
+				$(CURDIR)/1_case_studies/3_turtlebot3/README.md
 
 ## Reconnaissance ##########
 SOURCE_FILES := $(SOURCE_FILES) \
diff --git a/README.md b/README.md
index 7b182b5..ef3d4fb 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # `RHM`: Robot Hacking Manual
 
-[<ins>Download in PDF `RHM v0.3`<ins>](https://github.com/vmayoral/robot_hacking_manual/releases/download/0.3/RHM.pdf) ┃ <span style="background-color: #FFFF00">[Read online](https://rhm.cybersecurityrobotics.net/)</span>
+[<ins>Download in PDF `RHM v0.4`<ins>](https://github.com/vmayoral/robot_hacking_manual/releases/download/0.4/RHM.pdf) ┃ <span style="background-color: #FFFF00">[Read online](https://rhm.cybersecurityrobotics.net/)</span>
 
 The *Robot Hacking Manual* (`RHM`) is an introductory series about cybersecurity for robots, with an attempt to provide comprehensive case studies and step-by-step tutorials with the intent to raise awareness in the field and highlight the importance of taking a *security-first*[^0] approach. The material available here is also a personal learning attempt and it's disconnected from any particular organization. Content is provided as is and **by no means I encourage or promote the unauthorized tampering of robotic systems or related technologies**.