diff --git a/docker/1.5/Dockerfile b/docker/1.5/Dockerfile
index 28d4fe4103..00fed0b9c2 100644
--- a/docker/1.5/Dockerfile
+++ b/docker/1.5/Dockerfile
@@ -14,8 +14,7 @@ RUN set -x && \
         cmake \
         gnupg \
         libressl-dev \
-        util-linux-dev \
-        ca-certificates && \
+        util-linux-dev && \
     wget https://github.com/warmcat/libwebsockets/archive/v${LWS_VERSION}.tar.gz -O /tmp/lws.tar.gz && \
     mkdir -p /build/lws && \
     tar --strip=1 -xf /tmp/lws.tar.gz -C /build/lws && \
@@ -76,7 +75,7 @@ RUN set -x && \
     install -m644 /build/mosq/mosquitto.conf /mosquitto/config/mosquitto.conf && \
     chown -R mosquitto:mosquitto /mosquitto && \
     apk --no-cache add \
-        libuuid && \
+        libuuid ca-certificates && \
     apk del build-deps && \
     rm -rf /build
 
diff --git a/docker/1.6/Dockerfile b/docker/1.6/Dockerfile
index b1f63b1009..da2da3b859 100644
--- a/docker/1.6/Dockerfile
+++ b/docker/1.6/Dockerfile
@@ -14,8 +14,7 @@ RUN set -x && \
         cmake \
         gnupg \
         libressl-dev \
-        util-linux-dev \
-        ca-certificates && \
+        util-linux-dev && \
     wget https://github.com/warmcat/libwebsockets/archive/v${LWS_VERSION}.tar.gz -O /tmp/lws.tar.gz && \
     mkdir -p /build/lws && \
     tar --strip=1 -xf /tmp/lws.tar.gz -C /build/lws && \
@@ -79,6 +78,8 @@ RUN set -x && \
     install -s -m755 /build/mosq/src/mosquitto_passwd /usr/bin/mosquitto_passwd && \
     install -m644 /build/mosq/mosquitto.conf /mosquitto/config/mosquitto.conf && \
     chown -R mosquitto:mosquitto /mosquitto && \
+    apk --no-cache add \
+        ca-certificates && \
     apk del build-deps && \
     rm -rf /build
 
diff --git a/docker/local/Dockerfile b/docker/local/Dockerfile
index 5e699ad467..ffb17c216e 100644
--- a/docker/local/Dockerfile
+++ b/docker/local/Dockerfile
@@ -13,8 +13,7 @@ RUN set -x && \
         cmake \
         gnupg \
         libressl-dev \
-        util-linux-dev \
-        ca-certificates && \
+        util-linux-dev && \
     wget https://github.com/warmcat/libwebsockets/archive/v${LWS_VERSION}.tar.gz -O /tmp/lws.tar.gz && \
     mkdir -p /build/lws && \
     tar --strip=1 -xf /tmp/lws.tar.gz -C /build/lws && \
@@ -60,6 +59,8 @@ RUN set -x && \
     install -s -m755 /build/mosq/src/mosquitto_passwd /usr/bin/mosquitto_passwd && \
     install -m644 /build/mosq/mosquitto.conf /mosquitto/config/mosquitto.conf && \
     chown -R mosquitto:mosquitto /mosquitto && \
+    apk --no-cache add \
+        ca-certificates && \
     apk del build-deps && \
     rm -rf /build