diff --git a/requirements.txt b/requirements.txt
index 277e0873..ebd45147 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 optimade[server]~=0.25.3
 aiida-core~=2.4.0
-pymatgen>=2019.7.2,!=2019.9.7,<2024.4.14
+pymatgen>=2019.7.2,!=2019.9.7,<2024.5.2
 
 # Dependencies used directly in this package, but included through other dependencies:
 # aiida-core: