diff --git a/pyproject.toml b/pyproject.toml
index c52cfc1d0..0635cfa14 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,8 +33,8 @@ requires-python = ">=3.8"
 dependencies = [
   "click",
   "genno >= 1.16",
-  "JPype1 <= 1.4.0; python_version <= 3.10",
-  "JPype1 >= 1.5.0; python_version >= 3.11",
+  "JPype1 <= 1.4.0; python_version <= '3.10'",
+  "JPype1 >= 1.5.0; python_version >= '3.11'",
   "openpyxl",
   "pandas >= 1.2",
   "pint",