diff --git a/.github/workflows/ci_tests.yaml b/.github/workflows/ci_tests.yaml
index c725cb3e30b..806aa20545e 100644
--- a/.github/workflows/ci_tests.yaml
+++ b/.github/workflows/ci_tests.yaml
@@ -44,11 +44,11 @@ jobs:
           # - os: ubuntu-latest
           #   python-version: 3.7
           #   isDraft: true
-        # Pair Python 3.7 with NumPy 1.18 and Python 3.9 with NumPy 1.21
+        # Pair Python 3.7 with NumPy 1.19 and Python 3.9 with NumPy 1.21
         # Only install optional packages on Python 3.9/NumPy 1.21
         include:
           - python-version: 3.7
-            numpy-version: '1.18'
+            numpy-version: '1.19'
             optional-packages: ''
           - python-version: 3.9
             numpy-version: '1.21'
diff --git a/README.rst b/README.rst
index bbee9d6fad8..3ddb963e25f 100644
--- a/README.rst
+++ b/README.rst
@@ -219,7 +219,7 @@ Compatibility with GMT/Python/NumPy versions
       - `Dev Documentation <https://www.pygmt.org/dev>`_ (reflects `main branch <https://github.com/GenericMappingTools/pygmt>`_)
       - >=6.3.0
       - >=3.7
-      - >=1.18
+      - >=1.19
     * - `v0.5.0 <https://github.com/GenericMappingTools/pygmt/releases/tag/v0.5.0>`_ (latest release)
       - `v0.5.0 Documentation <https://www.pygmt.org/v0.5.0>`_
       - >=6.2.0
diff --git a/doc/install.rst b/doc/install.rst
index 3afd27a77d3..41fc0e05fa2 100644
--- a/doc/install.rst
+++ b/doc/install.rst
@@ -69,7 +69,7 @@ Dependencies
 
 PyGMT requires the following libraries to be installed:
 
-* `numpy <https://numpy.org>`__ (>= 1.18)
+* `numpy <https://numpy.org>`__ (>= 1.19)
 * `pandas <https://pandas.pydata.org>`__
 * `xarray <https://xarray.pydata.org>`__
 * `netCDF4 <https://unidata.github.io/netcdf4-python>`__
diff --git a/environment.yml b/environment.yml
index 6adf71b8ba6..3fb89717c7f 100644
--- a/environment.yml
+++ b/environment.yml
@@ -6,7 +6,7 @@ dependencies:
     # Required dependencies
     - pip
     - gmt=6.3.0
-    - numpy>=1.18
+    - numpy>=1.19
     - pandas
     - xarray
     - netCDF4
diff --git a/requirements.txt b/requirements.txt
index 37e10658db7..526478cea2c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 # Required packages
-numpy>=1.18
+numpy>=1.19
 pandas
 xarray
 netCDF4
diff --git a/setup.py b/setup.py
index 3a2e261af3f..264f06355a3 100644
--- a/setup.py
+++ b/setup.py
@@ -35,7 +35,7 @@
 ]
 PLATFORMS = "Any"
 PYTHON_REQUIRES = ">=3.7"
-INSTALL_REQUIRES = ["numpy>=1.18", "pandas", "xarray", "netCDF4", "packaging"]
+INSTALL_REQUIRES = ["numpy>=1.19", "pandas", "xarray", "netCDF4", "packaging"]
 # Configuration for setuptools-scm
 SETUP_REQUIRES = ["setuptools_scm"]
 USE_SCM_VERSION = {"local_scheme": "node-and-date", "fallback_version": "unknown"}