diff --git a/pyproject.toml b/pyproject.toml
index 1674cca..5dab71c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,14 +29,14 @@ dynamic = ["version"]
 
 dependencies = [
     "DLite-Python ~=0.5.29,!=0.5.40",
-    "eval-type-backport ~=0.3.1",
+    "eval-type-backport >=0.3.1,<0.5.0",
     "fastapi ~=0.136.0",
     "optimade[mongo] ~=1.4",
     "oteapi-core >=1.0.1,<2",
     "oteapi-dlite >=1.0.1,<2",
     "Pillow >=12.2.0",  # for safety reason, not a direct dependency
     "requests ~=2.33",
-    "uvicorn[standard] >=0.45,<0.49",
+    "uvicorn[standard] >=0.45,<0.50",
 ]
 
 [project.optional-dependencies]