diff --git a/contrib/docker/Dockerfile b/contrib/docker/Dockerfile
index d330e635..6fc7b1ff 100755
--- a/contrib/docker/Dockerfile
+++ b/contrib/docker/Dockerfile
@@ -26,7 +26,7 @@ RUN ./make_debian.sh
 FROM $BASE_IMAGE-slim as image
 
 RUN apt-get update && apt-get install -y \
-    libmosquitto1 libssl1.1 libstdc++6 libc6 libgcc1 \
+    libmosquitto1 libssl1.1 ca-certificates libstdc++6 libc6 libgcc1 \
     && rm -rf /var/lib/apt/lists/*
 
 LABEL maintainer="ebusd@ebusd.eu"
diff --git a/contrib/docker/Dockerfile.release b/contrib/docker/Dockerfile.release
index 4b30a81a..3086ef82 100644
--- a/contrib/docker/Dockerfile.release
+++ b/contrib/docker/Dockerfile.release
@@ -26,7 +26,7 @@ RUN ./make_debian.sh
 FROM $BASE_IMAGE-slim as image
 
 RUN apt-get update && apt-get install -y \
-    libmosquitto1 libssl1.1 libstdc++6 libc6 libgcc1 \
+    libmosquitto1 libssl1.1 ca-certificates libstdc++6 libc6 libgcc1 \
     && rm -rf /var/lib/apt/lists/*
 
 LABEL maintainer="ebusd@ebusd.eu"
diff --git a/contrib/docker/Dockerfile.template b/contrib/docker/Dockerfile.template
index 3be96cf7..a2770bd9 100644
--- a/contrib/docker/Dockerfile.template
+++ b/contrib/docker/Dockerfile.template
@@ -26,7 +26,7 @@ RUN %EBUSD_MAKE%
 FROM $BASE_IMAGE-slim as image
 
 RUN apt-get update && apt-get install -y \
-    libmosquitto1 libssl1.1 libstdc++6 libc6 libgcc1 \
+    libmosquitto1 libssl1.1 ca-certificates libstdc++6 libc6 libgcc1 \
     && rm -rf /var/lib/apt/lists/*
 
 LABEL maintainer="ebusd@ebusd.eu"