diff --git a/Tutorial/demo_mutag.py b/Tutorial/demo_mutag.py
index 7f7887cb..6de15f15 100644
--- a/Tutorial/demo_mutag.py
+++ b/Tutorial/demo_mutag.py
@@ -11,10 +11,10 @@
 
 # Load data
 # comment next line if data.mutag is in a different folder
-mutag_list = np.load("graphkernels/data.mutag")
+mutag_list = np.load("graphkernels/data.mutag", allow_pickle=True)
 
 # Uncomment next line if data.mutag is in your current folder
-#mutag_list = np.load("data.mutag")
+#mutag_list = np.load("data.mutag", allow_pickle=True)
 
 ### ALL KERNELS COMPUTE
 K1 = gk.CalculateEdgeHistKernel(mutag_list)
diff --git a/src/GKextCPy/setup.py b/src/GKextCPy/setup.py
index 2b481b43..f3248bd8 100644
--- a/src/GKextCPy/setup.py
+++ b/src/GKextCPy/setup.py
@@ -13,7 +13,7 @@
 
 # Solve the chicken-and-egg problem of requiring packages *before* the
 # script has been parsed.
-for package in ['numpy', 'pkgconfig']:
+for package in ['numpy<2.0', 'pkgconfig']:
 
     # Don't try to install packages that already exist.
     try:
@@ -55,7 +55,7 @@ def get_include_dirs():
 )
 
 setup(name = 'GKextCPy',
-    version = '0.4.1',
+    version = '0.4.2',
     author = 'Elisabetta Ghisu',
     description = """Graph Kernels: building the extension Python module. This is a wrapper package from C++ to Python.""",
     ext_modules = [GKextCPy_module],