diff --git a/.github/workflows/test-python-package-with-conda.yml b/.github/workflows/test-python-package-with-conda.yml
index 4c6d1c10..10d18764 100644
--- a/.github/workflows/test-python-package-with-conda.yml
+++ b/.github/workflows/test-python-package-with-conda.yml
@@ -15,6 +15,7 @@ jobs:
           - '3.10'
           - '3.11'
         numpy-version:
+          - '1.18'
           - '1.19'
           - '1.20'
           - '1.21'
@@ -52,6 +53,8 @@ jobs:
 
 
             # NumPy <1.21 are too old for Python 3.10
+            - python-version: '3.10'
+              numpy-version: '1.18'
             - python-version: '3.10'
               numpy-version: '1.19'
             - python-version: '3.10'
@@ -59,6 +62,8 @@ jobs:
 
 
             # NumPy <1.23 are too old for Python 3.11
+            - python-version: '3.11'
+              numpy-version: '1.18'
             - python-version: '3.11'
               numpy-version: '1.19'
             - python-version: '3.11'
@@ -75,7 +80,7 @@ jobs:
         cache-environment: true
         cache-downloads: false
         environment-name: mahotas_test_env
-        create-args: python=${{ matrix.python-version }} numpy=${{ matrix.numpy-version }}
+        create-args: python=${{ matrix.python-version }} python_abi=${{ matrix.python-version }} numpy=${{ matrix.numpy-version }}
 
     - name: Install dependencies
       shell: bash -l {0}