diff --git a/README.md b/README.md
index e882b2e..e4f43d5 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ the coordinates of the boundary points along each axis).
 ## Installation
 
 Requirements:
-* python 3 (written and tested with 3.9)
+* python >3.11 (written and tested with 3.12)
 * numpy
 * [float_raster](https://mpxd.net/code/jan/float_raster)
 * matplotlib (optional, used for visualization functions)
diff --git a/pyproject.toml b/pyproject.toml
index e9ac6be..3d24be1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,13 +32,13 @@ classifiers = [
     "Topic :: Scientific/Engineering :: Physics",
     "Topic :: Scientific/Engineering :: Visualization",
     ]
-requires-python = ">=3.8"
+requires-python = ">=3.11"
 include = [
     "LICENSE.md"
     ]
 dynamic = ["version"]
 dependencies = [
-    "numpy~=1.21",
+    "numpy~=1.26",
     "float_raster",
     ]