diff --git a/docker-contributor/Dockerfile b/docker-contributor/Dockerfile
index 3be8a7c..86d49a0 100644
--- a/docker-contributor/Dockerfile
+++ b/docker-contributor/Dockerfile
@@ -14,7 +14,7 @@ ENV DEBIAN_FRONTEND=noninteractive \
   FPM_MAX_CHILDREN=40 \
   DJ_SKIP_MAKE=0 \
   DJ_DB_INSTALL_BARE=0 \
-  PHPSUPPORTED="8.1 8.2 8.3" \
+  PHPSUPPORTED="8.1 8.2 8.3 8.4" \
   DEFAULTPHPVERSION="8.3" \
   DEFAULTWEBSERVER="nginx" \
   APTINSTALL="apt-get install -y -o Dpkg::Options::=--force-confdef -o Dpkg::Options::=--force-confold"
diff --git a/docker-gitlabci/Dockerfile b/docker-gitlabci/Dockerfile
index 0ce0c49..53f44b1 100644
--- a/docker-gitlabci/Dockerfile
+++ b/docker-gitlabci/Dockerfile
@@ -1,6 +1,6 @@
 FROM ubuntu:24.04
 ENV DEBIAN_FRONTEND=noninteractive
-ENV PHPSUPPORTED="7.4 8.0 8.1 8.2"
+ENV PHPSUPPORTED="7.4 8.0 8.1 8.2 8.4"
 ENV APTINSTALL="apt-get install -y -o Dpkg::Options::=--force-confdef -o Dpkg::Options::=--force-confold"
 RUN useradd -m domjudge
 RUN useradd -d /nonexistent -g nogroup -s /bin/false domjudge-run-0