diff --git a/docker/dockerfiles/joex.dockerfile b/docker/dockerfiles/joex.dockerfile
index fcbecf97..4798f292 100644
--- a/docker/dockerfiles/joex.dockerfile
+++ b/docker/dockerfiles/joex.dockerfile
@@ -53,7 +53,7 @@ RUN JDKPKG="openjdk11-jre"; \
     qpdf-dev \
     openssl-dev \
     ocrmypdf \
-  && apk add 'zlib=1.2.12-r1' \
+  && apk add 'zlib=1.2.12-r2' \
   && pip3 install --upgrade pip \
   && pip3 install ocrmypdf \
   && curl -Ls $UNO_URL -o /usr/local/bin/unoconv \
diff --git a/docker/dockerfiles/restserver.dockerfile b/docker/dockerfiles/restserver.dockerfile
index cd0d7003..d5c01822 100644
--- a/docker/dockerfiles/restserver.dockerfile
+++ b/docker/dockerfiles/restserver.dockerfile
@@ -8,7 +8,7 @@ RUN JDKPKG="openjdk11-jre"; \
     if [[ $TARGETPLATFORM = linux/arm* ]]; then JDKPKG="openjdk8-jre"; fi; \
     apk update && \
     apk add --no-cache $JDKPKG bash tzdata && \
-    apk add 'zlib=1.2.12-r1'
+    apk add 'zlib=1.2.12-r2'
 
 WORKDIR /opt
 RUN wget ${restserver_url:-https://github.com/eikek/docspell/releases/download/v$version/docspell-restserver-$version.zip} && \