diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index aec78ee4d..40490df3a 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -20,4 +20,4 @@ dependencies:
 - sqsgenerator =0.5.4
 - hatchling =1.29.0
 - hatch-vcs =0.5.0
-- mp-api =0.37.2
+- mp-api =0.45.15
diff --git a/pyproject.toml b/pyproject.toml
index a99c5b4c8..58b261497 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -56,7 +56,7 @@ phonopy = [
     "spglib==2.7.0",
 ]
 mp-api = [
-    "mp-api==0.37.2",
+    "mp-api==0.45.15",
     "pymatgen==2026.3.23",
 ]