diff --git a/packages/py-nestml/package.py b/packages/py-nestml/package.py
index b57f252aa8efd564d79e1f69542d36b16b59c0f1..30fc96c9e220407c577f98bdbd288ce8ce30bd2e 100644
--- a/packages/py-nestml/package.py
+++ b/packages/py-nestml/package.py
@@ -26,7 +26,7 @@ class PyNestml(PythonPackage):
     depends_on('py-pip', type='build')
     depends_on('py-numpy@1.8.2:', type=('build', 'run'))
     depends_on('py-scipy', type=('build', 'run'))
-    depends_on('py-sympy@1.1.1:1.11', type=('build', 'run'))
+    depends_on('py-sympy@1.1.1:1.10.1', type=('build', 'run'))
     depends_on('py-antlr4-python3-runtime@4.10:', type=('build', 'run'))
     depends_on('py-setuptools', type=('build', 'run'))
     depends_on('py-jinja2@2.10:', type=('build', 'run'))