diff --git a/Dockerfile b/Dockerfile
index 6537ffc..96fa57f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,7 +14,7 @@ WORKDIR /root/coturn
 RUN apt-get update && apt-get dist-upgrade -y && apt-get install -y \
     build-essential="12.6" \
     pkg-config="0.29.2-1" \
-    libssl-dev="1.1.1k-1" \
+    libssl-dev="1.1.1k-1+deb11u1" \
     libevent-dev="2.1.12-stable-1" \
     curl \
  && PCV=$(echo "${PROMETHEUS_CLIENT_VERSION}" | cut -c 2-) \