diff --git a/external-libs/android32.Dockerfile b/external-libs/android32.Dockerfile
index 254f3a1c..83d68a54 100644
--- a/external-libs/android32.Dockerfile
+++ b/external-libs/android32.Dockerfile
@@ -80,8 +80,8 @@ RUN set -x \
     && ./b2 --build-type=minimal link=static runtime-link=static --with-chrono --with-date_time --with-filesystem --with-program_options --with-regex --with-serialization --with-system --with-thread --with-locale --build-dir=android --stagedir=android toolset=clang threading=multi threadapi=pthread target-os=android -sICONV_PATH=${PREFIX} install -j${NPROC}
 
 # download, configure and make Zlib
-ENV ZLIB_VERSION 1.2.12
-ENV ZLIB_HASH 91844808532e5ce316b3c010929493c0244f3d37593afd6de04f71821d5136d9
+ENV ZLIB_VERSION 1.2.13
+ENV ZLIB_HASH b3a24de97a8fdbc835b9833169501030b8977031bcb54b3b3ac13740f846ab30
 RUN set -x \
     && curl -O https://zlib.net/zlib-${ZLIB_VERSION}.tar.gz \
     && echo "${ZLIB_HASH}  zlib-${ZLIB_VERSION}.tar.gz" | sha256sum -c \
diff --git a/external-libs/android32_x86.Dockerfile b/external-libs/android32_x86.Dockerfile
index 76f2efee..f6207ec4 100644
--- a/external-libs/android32_x86.Dockerfile
+++ b/external-libs/android32_x86.Dockerfile
@@ -80,8 +80,8 @@ RUN set -x \
     && ./b2 --build-type=minimal link=static runtime-link=static --with-chrono --with-date_time --with-filesystem --with-program_options --with-regex --with-serialization --with-system --with-thread --with-locale --build-dir=android --stagedir=android toolset=clang threading=multi threadapi=pthread target-os=android -sICONV_PATH=${PREFIX} install -j${NPROC}
 
 # download, configure and make Zlib
-ENV ZLIB_VERSION 1.2.12
-ENV ZLIB_HASH 91844808532e5ce316b3c010929493c0244f3d37593afd6de04f71821d5136d9
+ENV ZLIB_VERSION 1.2.13
+ENV ZLIB_HASH b3a24de97a8fdbc835b9833169501030b8977031bcb54b3b3ac13740f846ab30
 RUN set -x \
     && curl -O https://zlib.net/zlib-${ZLIB_VERSION}.tar.gz \
     && echo "${ZLIB_HASH}  zlib-${ZLIB_VERSION}.tar.gz" | sha256sum -c \
diff --git a/external-libs/android64.Dockerfile b/external-libs/android64.Dockerfile
index 5e24fce5..e48494cb 100644
--- a/external-libs/android64.Dockerfile
+++ b/external-libs/android64.Dockerfile
@@ -80,8 +80,8 @@ RUN set -x \
     && ./b2 --build-type=minimal link=static runtime-link=static --with-chrono --with-date_time --with-filesystem --with-program_options --with-regex --with-serialization --with-system --with-thread --with-locale --build-dir=android --stagedir=android toolset=clang threading=multi threadapi=pthread target-os=android -sICONV_PATH=${PREFIX} install -j${NPROC}
 
 # download, configure and make Zlib
-ENV ZLIB_VERSION 1.2.12
-ENV ZLIB_HASH 91844808532e5ce316b3c010929493c0244f3d37593afd6de04f71821d5136d9
+ENV ZLIB_VERSION 1.2.13
+ENV ZLIB_HASH b3a24de97a8fdbc835b9833169501030b8977031bcb54b3b3ac13740f846ab30
 RUN set -x \
     && curl -O https://zlib.net/zlib-${ZLIB_VERSION}.tar.gz \
     && echo "${ZLIB_HASH}  zlib-${ZLIB_VERSION}.tar.gz" | sha256sum -c \
diff --git a/external-libs/android64_x86.Dockerfile b/external-libs/android64_x86.Dockerfile
index 142fc3ac..60328b1a 100644
--- a/external-libs/android64_x86.Dockerfile
+++ b/external-libs/android64_x86.Dockerfile
@@ -80,8 +80,8 @@ RUN set -x \
     && ./b2 --build-type=minimal link=static runtime-link=static --with-chrono --with-date_time --with-filesystem --with-program_options --with-regex --with-serialization --with-system --with-thread --with-locale --build-dir=android --stagedir=android toolset=clang threading=multi threadapi=pthread target-os=android -sICONV_PATH=${PREFIX} install -j${NPROC}
 
 # download, configure and make Zlib
-ENV ZLIB_VERSION 1.2.12
-ENV ZLIB_HASH 91844808532e5ce316b3c010929493c0244f3d37593afd6de04f71821d5136d9
+ENV ZLIB_VERSION 1.2.13
+ENV ZLIB_HASH b3a24de97a8fdbc835b9833169501030b8977031bcb54b3b3ac13740f846ab30
 RUN set -x \
     && curl -O https://zlib.net/zlib-${ZLIB_VERSION}.tar.gz \
     && echo "${ZLIB_HASH}  zlib-${ZLIB_VERSION}.tar.gz" | sha256sum -c \