diff --git a/pyproject.toml b/pyproject.toml
index 05d0d8d..0b1ed09 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ dependencies = [
     "data-collections-api==0.1.0",
     "MDAnalysis==2.10.0",
     "python-dotenv==1.2.2",
-    "gunicorn>=23,<24",
+    "gunicorn>=26,<27",
     "biosim-extractor>=0.0.2,<1.0"
 ]