diff --git a/Dockerfile b/Dockerfile
index a9ac789..b9bf9e4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ WORKDIR /opt/phpdoc
 
 RUN composer install
 
-FROM php:7.3-alpine
+FROM php:7.4.9-alpine
 
 COPY --from=builder /opt/phpdoc /opt/phpdoc