Update README.md

Author: Evalle

README.md

@@ -149,7 +149,7 @@ Some of the products have been renamed, there are no changes regarding this in t
 ## Useful Links
 
 - [About the exam](https://training.mirantis.com/dca-certification-exam/)
-- [Official study guide (PDF)](https://a.storyblok.com/f/146871/x/6daa07336d/docker-study-guide_v1-5-october.pdf)
+- [Official study guide (PDF)](https://a.storyblok.com/f/146871/x/2001ce939c/docker-study-guide_v1-5-jan-2025.pdf)
 - [Schedule your Docker Certified Associate Exam](https://prod.examity.com/docker)
 
 ## Preparation