diff --git a/Dockerfile b/Dockerfile
index 4324c79..c23a0b8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,6 +2,7 @@ FROM debian:11
 RUN apt update && apt install -y build-essential libgl1-mesa-dev git cmake libmariadb-dev
 RUN git clone https://code.qt.io/qt/qt5.git /root/qt6
 WORKDIR /root/qt6
+RUN git checkout 6.4
 RUN perl init-repository --module-subset=qtbase,qtpositioning,qthttpserver
 RUN mkdir /root/qt6-build && cd /root/qt6-build && /root/qt6/configure
 WORKDIR /root/qt6-build