diff --git a/.github/workflows/acceptance-tests.yml b/.github/workflows/acceptance-tests.yml
index 08224671..9ea0135a 100644
--- a/.github/workflows/acceptance-tests.yml
+++ b/.github/workflows/acceptance-tests.yml
@@ -51,12 +51,12 @@ jobs:
           - '6.6'
         php:
           # Most recent version of PHP supported by all of the above, plus 7.4
-          - '8.3'
+          - '8.3.23'
           - '7.4'
         include:
           # Latest WordPress on PHP 8.4
           - wp: '6.8'
-            php: '8.4'
+            php: '8.4.10'
           # Oldest supported WordPress
           - wp: '6.0'
             php: '7.4'