diff --git a/README.md b/README.md
index 40466a0..600ff70 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ Title|Topics|Place|Deadline|Dates|Details
 -----|------|-----|--------|-----|-------
 Bumblekite Machine Learning Summer School in Health, care and biosciences <img src="https://img.shields.io/badge/featured-blue?style=plastic" alt="featured" width="50" />|Machine Learning, ML for Health, ML for Biology|Zürich, Switzerland|Mar 09, 2025 <br>⏰ [Add to Calendar](https://awesome-mlss.com/summerschool/bumblekite25)|Jun 22 - Jun 28, 2025|[Details](https://awesome-mlss.com/summerschool/bumblekite25)
 Reasoning Web Summer School|Knowledge Representation, Logic|Istanbul, Türkiye|Jun 09, 2025 <br>⏰ [Add to Calendar](https://awesome-mlss.com/summerschool/rw25)|Sep 25 - Sep 28, 2025|[Details](https://awesome-mlss.com/summerschool/rw25)
-International Artificial Intelligence Summer School|Machine Learning|Grosseto, Italy|Mar 23, 2025 <br>⏰ [Add to Calendar](https://awesome-mlss.com/summerschool/IAISS25)|Sep 21 - Sep 25, 2025|[Details](https://awesome-mlss.com/summerschool/IAISS25)
+International Artificial Intelligence Summer School|Machine Learning|Grosseto, Italy|Apr 23, 2025 <br>⏰ [Add to Calendar](https://awesome-mlss.com/summerschool/IAISS25)|Sep 21 - Sep 25, 2025|[Details](https://awesome-mlss.com/summerschool/IAISS25)
 Mediterranean Machine Learning (M2L) Summer School|Machine Learning, Natural Language Proc, Computer Vision, Generative AI, Reinforcement Learning|Split, Croatia|Mar 28, 2025 <br>⏰ [Add to Calendar](https://awesome-mlss.com/summerschool/m2l25)|Sep 08 - Sep 12, 2025|[Details](https://awesome-mlss.com/summerschool/m2l25)
 ELLIS Summer School: AI for Earth and Climate Sciences|Machine Learning, Generative AI, ML for Science, ML for Biology, Computer Vision|Jena, Germany|Mar 31, 2025 <br>⏰ [Add to Calendar](https://awesome-mlss.com/summerschool/jena25)|Sep 01 - Sep 05, 2025|[Details](https://awesome-mlss.com/summerschool/jena25)
 School on Analytical Connectionism|ML Theory, Cognitive Science|London, UK|Apr 18, 2025 <br>⏰ [Add to Calendar](https://awesome-mlss.com/summerschool/ac25)|Aug 25 - Sep 05, 2025|[Details](https://awesome-mlss.com/summerschool/ac25)
diff --git a/site/_data/summerschools.yml b/site/_data/summerschools.yml
index d514a5e..674196f 100644
--- a/site/_data/summerschools.yml
+++ b/site/_data/summerschools.yml
@@ -111,7 +111,7 @@
   id: IAISS25
   full_name: "International Artificial Intelligence Summer School (IAISS) 2025"
   link: "https://2025.iaiss.cc/"
-  deadline: "2025-03-23 23:59:59"
+  deadline: "2025-04-23 23:59:59"
   timezone: "Europe/Rome"
   place: "Grosseto, Italy"
   date: "Sep 21 - Sep 25, 2025"