diff --git a/.github/workflows/docker-php7.4.yml b/.github/workflows/docker-php7.4.yml
index 4b8de353..69825605 100644
--- a/.github/workflows/docker-php7.4.yml
+++ b/.github/workflows/docker-php7.4.yml
@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - php7.4
+  workflow_dispatch:
 
 jobs:
   docker: