diff --git a/website_files/CaseStudies/2024/Custom_libraries.md b/website_files/CaseStudies/2024/Custom_libraries.md
index 440b4e08..6a43c96d 100644
--- a/website_files/CaseStudies/2024/Custom_libraries.md
+++ b/website_files/CaseStudies/2024/Custom_libraries.md
@@ -4,8 +4,8 @@ template: casestudy.html
 title: Building a library of STACK functions for use throughout a linear algebra course
 authors: Luke Longworth
 shortdescription: Considerations when writing a collection of quiz questions in a specialised topic, and using stack_include to achieve this.
-cardimage: vector_notation.png
-cardimagealt: vector_notation.png
+cardimage: vector_notation.PNG
+cardimagealt: vector_notation.PNG
 ---
 
 # Building a library of STACK functions for use throughout a linear algebra course
diff --git a/website_files/CaseStudies/2024/Use_of_STACK_at_USDM.md b/website_files/CaseStudies/2024/Use_of_STACK_at_USDM.md
index 9d82642b..4eb07798 100644
--- a/website_files/CaseStudies/2024/Use_of_STACK_at_USDM.md
+++ b/website_files/CaseStudies/2024/Use_of_STACK_at_USDM.md
@@ -4,7 +4,7 @@ template: casestudy.html
 title: Experiences, Challenges and Opportunities of Online Mathematics Teaching with STACK at the University of Dar es Salaam, Tanzania
 authors: Idrissa S. Amour, Daudi A. Zacharia, Abdi T. Abdalla, Fatuma Simba, Septimi Kitta
 shortdescription: A description of the use of STACK at the University of Dar es Salaam (UDSM), Tanzania
-cardimage: udsm_card.png
+cardimage: udsm_card.PNG
 cardimagealt:
 ---