diff --git a/pyproject.toml b/pyproject.toml
index f52a626c..d3cbc411 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -56,7 +56,7 @@ Homepage = "https://python-ellar.github.io/ellar/"
 
 [project.optional-dependencies]
 all = [
-    "python-multipart >=0.0.5,<0.0.10",
+    "python-multipart >=0.0.5,<0.0.21",
     "itsdangerous >=1.1.0,<3.0.0",
     "pyyaml >=5.3.1,<7.0.0",
     "ujson >=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0,<6.0.0",