diff --git a/RELEASE_NOTES.rst b/RELEASE_NOTES.rst
index aae2f0f90..62ff2f396 100644
--- a/RELEASE_NOTES.rst
+++ b/RELEASE_NOTES.rst
@@ -28,6 +28,7 @@ All changes
   - When a :class:`.GAMSModel` is solved with an LP status of 5 (optimal, but with infeasibilities after unscaling), :class:`.JDBCBackend` would attempt to read the output GDX file and fail, leading to an uninformative error message (:issue:`98`).
     Now :class:`.ModelError` is raised describing the situation.
 - Improved type hinting for static typing of code that uses :mod:`ixmp` (:issue:`465`, :pull:`500`).
+- Use JPype1 1.5.0 for Python 3.11 and later; JPype1 1.4.0 for Python 3.10 and earlier. 
 
 .. _v3.7.0:
 
diff --git a/pyproject.toml b/pyproject.toml
index d1f01f475..c52cfc1d0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,8 @@ requires-python = ">=3.8"
 dependencies = [
   "click",
   "genno >= 1.16",
-  "JPype1 >= 1.2.1",
+  "JPype1 <= 1.4.0; python_version <= 3.10",
+  "JPype1 >= 1.5.0; python_version >= 3.11",
   "openpyxl",
   "pandas >= 1.2",
   "pint",