diff --git a/Dockerfile.android b/Dockerfile.android
index 9036103c58..342f305714 100644
--- a/Dockerfile.android
+++ b/Dockerfile.android
@@ -52,9 +52,9 @@ ENV LIBEXPAT_VERSION=2.5.0
 ENV LIBEXPAT_ARCHIVE=expat-$LIBEXPAT_VERSION.tar.bz2
 ENV LIBEXPAT_URI=https://github.com/libexpat/libexpat/releases/download/R_2_5_0/$LIBEXPAT_ARCHIVE
 
-ENV ZLIB_VERSION=1.3
+ENV ZLIB_VERSION=1.3.1
 ENV ZLIB_ARCHIVE=zlib-$ZLIB_VERSION.tar.gz
-ENV ZLIB_URI=https://zlib.net/$ZLIB_ARCHIVE
+ENV ZLIB_URI=https://github.com/madler/zlib/releases/download/v1.3.1/$ZLIB_ARCHIVE
 
 ENV CARES_VERSION=1.21.0
 ENV CARES_ARCHIVE=c-ares-$CARES_VERSION.tar.gz
diff --git a/Dockerfile.mingw b/Dockerfile.mingw
index 7a416cef69..5f2d0e640b 100644
--- a/Dockerfile.mingw
+++ b/Dockerfile.mingw
@@ -32,7 +32,7 @@ RUN apt-get update && \
 RUN curl -L -O https://gmplib.org/download/gmp/gmp-6.3.0.tar.xz && \
     curl -L -O https://github.com/libexpat/libexpat/releases/download/R_2_5_0/expat-2.5.0.tar.bz2 && \
     curl -L -O https://www.sqlite.org/2023/sqlite-autoconf-3430100.tar.gz && \
-    curl -L -O https://www.zlib.net/zlib-1.3.tar.gz && \
+    curl -L -O https://github.com/madler/zlib/releases/download/v1.3.1/zlib-1.3.1.tar.gz && \
     curl -L -O https://c-ares.org/download/c-ares-1.19.1.tar.gz && \
     curl -L -O https://libssh2.org/download/libssh2-1.11.0.tar.bz2
 
@@ -68,8 +68,8 @@ RUN tar xf sqlite-autoconf-3430100.tar.gz && \
         --build=`dpkg-architecture -qDEB_BUILD_GNU_TYPE` && \
     make -j$(nproc) install
 
-RUN tar xf zlib-1.3.tar.gz && \
-    cd zlib-1.3 && \
+RUN tar xf zlib-1.3.1.tar.gz && \
+    cd zlib-1.3.1 && \
     CC=$HOST-gcc \
     AR=$HOST-ar \
     LD=$HOST-ld \
diff --git a/README.android b/README.android
index 997d0bac00..51bf748b01 100644
--- a/README.android
+++ b/README.android
@@ -44,7 +44,7 @@ The following libraries were statically linked.
 
 * openssl 1.1.1k
 * expat 2.4.1
-* zlib 1.2.11
+* zlib 1.3.1
 * c-ares 1.17.2
 * libssh2 1.9.0
 
diff --git a/README.mingw b/README.mingw
index df2fba2ea7..5492bbab3e 100644
--- a/README.mingw
+++ b/README.mingw
@@ -11,7 +11,7 @@ necessary. The linked libraries are:
 * gmp 6.3.0
 * expat 2.5.0
 * sqlite 3.43.1
-* zlib 1.3
+* zlib 1.3.1
 * c-ares 1.19.1
 * libssh2 1.11.0