diff --git a/setup.py b/setup.py
index 7d943cb..3ecd8db 100644
--- a/setup.py
+++ b/setup.py
@@ -75,6 +75,7 @@ def read(*names, **kwargs):
         "oemof.network==0.5.0a4",  # Temporal fix due to braking changes in 0.5.1
         "paramiko",
         "toml",
+        "numpy<2.0.0",  # To be deleted with higher oemof.solph version
     ],
     extras_require={
         "cli": ["click"],