diff --git a/tests/requirements.txt b/tests/requirements.txt
index 6f98065477..5cc2849b21 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,6 +1,6 @@
 ase @ git+https://gitlab.com/ase/ase.git
 custodian==2025.12.14
-emmet-core==0.86.3
+emmet-core==0.86.4
 frozendict==2.4.7
 monty==2026.2.18
 psutil==7.2.2