diff --git a/Dockerfile b/Dockerfile
index 330e4a2..bed788f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,10 +17,13 @@ RUN apt-get update && apt-get install --no-install-recommends -yqq \
 
 # install haproxy from official debian repos (https://haproxy.debian.net/)
 
-RUN curl https://haproxy.debian.net/bernat.debian.org.gpg | apt-key add -
-RUN echo deb http://haproxy.debian.net buster-backports-2.2 main | tee /etc/apt/sources.list.d/haproxy.list
-RUN apt-get update \
-    && apt-get install -yqq haproxy=2.2.\* \
+RUN curl https://haproxy.debian.net/bernat.debian.org.gpg \
+       | gpg --dearmor > /usr/share/keyrings/haproxy.debian.net.gpg \
+    && echo deb "[signed-by=/usr/share/keyrings/haproxy.debian.net.gpg]" \
+       http://haproxy.debian.net buster-backports-2.4 main \
+       > /etc/apt/sources.list.d/haproxy.list \
+    && apt-get update \
+    && apt-get install -yqq haproxy=2.4.\* \
     && apt-get clean autoclean && apt-get autoremove -y \
     && rm -rf /var/lib/apt/lists/*