diff --git a/.gitignore b/.gitignore
index 2dec1f9..21fb8e9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,7 @@ build/
 pylops_mpi.egg-info/
 .eggs/
 dist/
+*.pyc
 
 # Documentation
 docs/source/gallery
diff --git a/requirements-dev.txt b/requirements-dev.txt
index e183619..8581d34 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,4 @@
-numpy>=1.21.0
+numpy>=1.21.0, <2.0.0
 scipy>=1.8.0
 pylops>=2.0
 mpi4py