diff --git a/environment.yml b/environment.yml
index 98be2b7856..06ba81250b 100644
--- a/environment.yml
+++ b/environment.yml
@@ -9,7 +9,7 @@ channels:
 dependencies:
   - python
   - compilers
-  - numpy>=1.17.0
+  - numpy>=1.17.0,<1.26.0
   - scipy>=0.14
   - filelock
   - etuples
diff --git a/pyproject.toml b/pyproject.toml
index 7cfa7da8e7..73bb08168e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
 requires = [
   "setuptools>=48.0.0",
   "cython",
-  "numpy>=1.17.0",
+  "numpy>=1.17.0,<1.26",
   "versioneer[toml]==0.28",
 ]
 build-backend = "setuptools.build_meta"
@@ -52,7 +52,7 @@ keywords = [
 dependencies = [
     "setuptools>=48.0.0",
     "scipy>=0.14",
-    "numpy>=1.17.0",
+    "numpy>=1.17.0,<1.26",
     "filelock",
     "etuples",
     "logical-unification",