diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index aa92db7..211d2eb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -43,4 +43,10 @@ jobs:
           pytest-results-summary: true
         - windows: py312-xdist
           pytest-results-summary: true
+        - linux: py312-numpy21-xdist
+          pytest-results-summary: true
+        - macos: py312-numpy21-xdist
+          pytest-results-summary: true
+        - windows: py312-numpy21-xdist
+          pytest-results-summary: true
         - linux: py312-dev-xdist
diff --git a/tox.ini b/tox.ini
index cb814bb..de531fa 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,7 +2,7 @@
 envlist =
     check-{style,security,build}
     test{,-dev}{,-pyargs,-cov}
-    test-numpy{120,122,125}
+    test-numpy{120,121,122,125,20,21}
     build-{docs,dist}
 
 # tox environments are constructed with so-called 'factors' (or terms)
@@ -66,9 +66,13 @@ extras =
 deps =
     xdist: pytest-xdist
     cov: pytest-cov
+    numpy120: numpy==1.20.*
     numpy121: numpy==1.21.*
+    numpy122: numpy==1.22.*
     numpy123: numpy==1.23.*
     numpy125: numpy==1.25.*
+    numpy20: numpy==2.0.*
+    numpy21: numpy==2.1.*
 commands_pre =
     dev: pip install -r requirements-dev.txt -U --upgrade-strategy eager
     pip freeze