diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 0a8c524a3..0131d48b8 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -77,7 +77,7 @@ jobs:
       matrix:
         # Lint against the highest/lowest supported versions of each PHP major.
         # And also do a run against "nightly" (the current dev version of PHP).
-        php_version: ['7.2', '7.4', '8.0', '8.1', '8.2']
+        php_version: ['7.2', '7.4', '8.0', '8.2', '8.3']
 
     name: "Lint: PHP ${{ matrix.php_version }}"
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index fdf3aacb2..b1b851565 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -73,14 +73,14 @@ jobs:
 
     strategy:
       matrix:
-        php_version: ['7.3', '7.4', '8.0', '8.1']
+        php_version: ['7.3', '7.4', '8.0', '8.1', '8.2']
         coverage: [false]
 
         # Run code coverage only on high/low PHP.
         include:
         - php_version: 7.2
           coverage: true
-        - php_version: 8.2
+        - php_version: 8.3
           coverage: true
 
     name: "Unit Test: PHP ${{ matrix.php_version }}"
@@ -167,6 +167,12 @@ jobs:
           - php_version: "8.2"
             wp_version: "6.3"
             multisite: true
+            coverage: false
+
+          # WP 6.4 is the earliest version which supports PHP 8.3.
+          - php_version: '8.3'
+            wp_version: '6.4'
+            multisite: true
             coverage: true
 
     name: "WP Test: PHP ${{ matrix.php_version }} | WP ${{ matrix.wp_version }}${{ matrix.multisite == true && ' (+ ms)' || '' }}"