diff --git a/Dockerfile b/Dockerfile
index 0bdcaf4..122d80f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,13 +4,13 @@ FROM ubuntu:26.04
 RUN DEBIAN_FRONTEND=noninteractive apt update && apt -y install software-properties-common && add-apt-repository ppa:ondrej/php
 
 # base php & composer
-RUN DEBIAN_FRONTEND=noninteractive apt install -y --no-install-recommends php8.6-cli composer
+RUN DEBIAN_FRONTEND=noninteractive apt install -y --no-install-recommends php8.5-cli composer
 
 # curl, gd, xml
-RUN DEBIAN_FRONTEND=noninteractive apt install -y --no-install-recommends php8.6-gd php8.6-xml php8.6-curl php8.6-redis php8.6-mbstring php8.6-zip
+RUN DEBIAN_FRONTEND=noninteractive apt install -y --no-install-recommends php8.5-gd php8.5-xml php8.5-curl php8.5-redis php8.5-mbstring php8.5-zip
 
 # change locale
-RUN DEBIAN_FRONTEND=noninteractive apt install -y locales php8.6-intl \
+RUN DEBIAN_FRONTEND=noninteractive apt install -y locales php8.5-intl \
 	&& sed -i 's/^# *\(de_DE.UTF-8\)/\1/' /etc/locale.gen \
 	&& locale-gen