diff --git a/README.rst b/README.rst
index ee023c63562..450c01120c0 100644
--- a/README.rst
+++ b/README.rst
@@ -261,7 +261,7 @@ Compatibility with GMT/Python/NumPy versions
       - `Dev Documentation <https://www.pygmt.org/dev>`_ (reflects `main branch <https://github.com/GenericMappingTools/pygmt>`_)
       - >=6.3.0
       - >=3.8
-      - >=1.20
+      - >=1.21
     * - `v0.8.0 <https://github.com/GenericMappingTools/pygmt/releases/tag/v0.8.0>`_ (latest release)
       - `v0.8.0 Documentation <https://www.pygmt.org/v0.8.0>`_
       - >=6.3.0
diff --git a/ci/requirements/docs.yml b/ci/requirements/docs.yml
index a11194fec36..31decb7123f 100644
--- a/ci/requirements/docs.yml
+++ b/ci/requirements/docs.yml
@@ -6,7 +6,7 @@ dependencies:
     # Required dependencies
     - pip
     - gmt=6.4.0
-    - numpy>=1.20
+    - numpy>=1.21
     - pandas
     - xarray
     - netCDF4
diff --git a/doc/install.rst b/doc/install.rst
index 57071860961..dce36f59a5e 100644
--- a/doc/install.rst
+++ b/doc/install.rst
@@ -97,7 +97,7 @@ Dependencies
 
 PyGMT requires the following libraries to be installed:
 
-* `numpy <https://numpy.org>`__ (>= 1.20)
+* `numpy <https://numpy.org>`__ (>= 1.21)
 * `pandas <https://pandas.pydata.org>`__
 * `xarray <https://xarray.dev/>`__
 * `netCDF4 <https://unidata.github.io/netcdf4-python>`__
diff --git a/environment.yml b/environment.yml
index 6f7ca48edb4..3ed7b19fd2d 100644
--- a/environment.yml
+++ b/environment.yml
@@ -6,7 +6,7 @@ dependencies:
     # Required dependencies
     - pip
     - gmt=6.4.0
-    - numpy>=1.20
+    - numpy>=1.21
     - pandas
     - xarray
     - netCDF4
diff --git a/pyproject.toml b/pyproject.toml
index f0880e22304..ac3c37ad57d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,7 +32,7 @@ classifiers = [
     "License :: OSI Approved :: BSD License",
 ]
 dependencies = [
-    "numpy>=1.20",
+    "numpy>=1.21",
     "pandas",
     "xarray",
     "netCDF4",
diff --git a/requirements.txt b/requirements.txt
index 9ef40e8d895..41c008e0779 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 # Required packages
-numpy>=1.20
+numpy>=1.21
 pandas
 xarray
 netCDF4