diff --git a/schedule.md b/schedule.md
index f9422b54..262be5ff 100644
--- a/schedule.md
+++ b/schedule.md
@@ -239,7 +239,7 @@ title:  'Schedule - Omics integration and systems biology - 2024'
 <details>
   <summary>Resources</summary>
   <ul>
-    <li><a href="./session_gems/MetabModel_JLR_distrib.pdf">Introduction</a></li>
+    <li><a href="./session_gems/GEMs_concept.pdf">Introduction – Constraint-based modeling concept</a></li>
     <li><a href="./session_gems/Constraint-based-modeling-ELIXIR-Omics-Integration-and-Systems-Biology.pdf">Tools</a></li>
   </ul>
 </details>
diff --git a/session_gems/GEM_session_day1.pdf b/session_gems/GEM_session_day1.pdf
deleted file mode 100644
index 015bda44..00000000
Binary files a/session_gems/GEM_session_day1.pdf and /dev/null differ
diff --git a/session_gems/GEM_session_day2.pdf b/session_gems/GEM_session_day2.pdf
deleted file mode 100644
index f192f236..00000000
Binary files a/session_gems/GEM_session_day2.pdf and /dev/null differ
diff --git a/session_gems/GEMs_concept.pdf b/session_gems/GEMs_concept.pdf
new file mode 100644
index 00000000..09a61c20
Binary files /dev/null and b/session_gems/GEMs_concept.pdf differ
diff --git a/session_gems/lecture.pdf b/session_gems/lecture.pdf
deleted file mode 100644
index c7f6f835..00000000
Binary files a/session_gems/lecture.pdf and /dev/null differ