diff --git a/ci/docker/deb/Dockerfile b/ci/docker/deb/Dockerfile
index cad5530d2ef..5affc9bdd44 100644
--- a/ci/docker/deb/Dockerfile
+++ b/ci/docker/deb/Dockerfile
@@ -53,7 +53,7 @@ RUN apt-get update; apt-get -y dist-upgrade; \
     git distcc file wget openssl hwloc intltool-debian; \
     # Devel packages that ATS needs
     apt-get -y install libssl-dev libexpat1-dev libpcre3-dev libcap-dev \
-    libhwloc-dev libhwloc5 libunwind8 libunwind8-dev \
+    libhwloc-dev libhwloc5 libunwind8 libunwind8-dev zlib1g-dev \
     tcl-dev tcl8.6-dev libjemalloc-dev libluajit-5.1-dev liblzma-dev \
     libhiredis-dev libbrotli-dev libncurses-dev libgeoip-dev libmagick++-dev; \
     # Optional: This is for the OpenSSH server, and Jenkins account + access (comment out if not needed)
diff --git a/ci/docker/yum/Dockerfile b/ci/docker/yum/Dockerfile
index 5ddbaf15a01..85e9a7add64 100644
--- a/ci/docker/yum/Dockerfile
+++ b/ci/docker/yum/Dockerfile
@@ -52,7 +52,7 @@ RUN yum -y update; \
     # Devel packages that ATS needs
     yum -y install openssl-devel expat-devel pcre-devel libcap-devel hwloc-devel libunwind-devel \
     xz-devel libcurl-devel ncurses-devel jemalloc-devel GeoIP-devel luajit-devel brotli-devel \
-    ImageMagick-devel ImageMagick-c++-devel hiredis-devel \
+    ImageMagick-devel ImageMagick-c++-devel hiredis-devel zlib-devel \
     perl-ExtUtils-MakeMaker perl-Digest-SHA perl-URI; \
     # This is for autest stuff
     yum -y install python3 httpd-tools procps-ng nmap-ncat pipenv \