diff --git a/relenv/_toolchain/aarch64/aarch64-linux-gnu-ct-ng.config b/relenv/_toolchain/aarch64/aarch64-linux-gnu-ct-ng.config
index 75b137b0..ffd43142 100644
--- a/relenv/_toolchain/aarch64/aarch64-linux-gnu-ct-ng.config
+++ b/relenv/_toolchain/aarch64/aarch64-linux-gnu-ct-ng.config
@@ -759,7 +759,7 @@ CT_ZLIB_SRC_RELEASE=y
 CT_ZLIB_PATCH_ORDER="global"
 CT_ZLIB_V_1_2_12=y
 CT_ZLIB_VERSION="1.2.13"
-CT_ZLIB_MIRRORS="http://downloads.sourceforge.net/project/libpng/zlib/${CT_ZLIB_VERSION} https://www.zlib.net/"
+CT_ZLIB_MIRRORS="https://github.com/madler/zlib/releases/download/v${CT_ZLIB_VERSION}/ https://www.zlib.net/ https://www.zlib.net/fossils/"
 CT_ZLIB_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ZLIB_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ZLIB_ARCHIVE_FORMATS=".tar.xz .tar.gz"
diff --git a/relenv/_toolchain/aarch64/x86_64-linux-gnu-ct-ng.config b/relenv/_toolchain/aarch64/x86_64-linux-gnu-ct-ng.config
index 3e30aa32..4f51dbc5 100644
--- a/relenv/_toolchain/aarch64/x86_64-linux-gnu-ct-ng.config
+++ b/relenv/_toolchain/aarch64/x86_64-linux-gnu-ct-ng.config
@@ -761,7 +761,7 @@ CT_ZLIB_SRC_RELEASE=y
 CT_ZLIB_PATCH_ORDER="global"
 CT_ZLIB_V_1_2_12=y
 CT_ZLIB_VERSION="1.2.13"
-CT_ZLIB_MIRRORS="http://downloads.sourceforge.net/project/libpng/zlib/${CT_ZLIB_VERSION} https://www.zlib.net/"
+CT_ZLIB_MIRRORS="https://github.com/madler/zlib/releases/download/v${CT_ZLIB_VERSION}/ https://www.zlib.net/ https://www.zlib.net/fossils/"
 CT_ZLIB_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ZLIB_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ZLIB_ARCHIVE_FORMATS=".tar.xz .tar.gz"
diff --git a/relenv/_toolchain/x86_64/aarch64-linux-gnu-ct-ng.config b/relenv/_toolchain/x86_64/aarch64-linux-gnu-ct-ng.config
index 2396e670..5396025d 100644
--- a/relenv/_toolchain/x86_64/aarch64-linux-gnu-ct-ng.config
+++ b/relenv/_toolchain/x86_64/aarch64-linux-gnu-ct-ng.config
@@ -760,7 +760,7 @@ CT_ZLIB_SRC_RELEASE=y
 CT_ZLIB_PATCH_ORDER="global"
 CT_ZLIB_V_1_2_12=y
 CT_ZLIB_VERSION="1.2.13"
-CT_ZLIB_MIRRORS="http://downloads.sourceforge.net/project/libpng/zlib/${CT_ZLIB_VERSION} https://www.zlib.net/"
+CT_ZLIB_MIRRORS="https://github.com/madler/zlib/releases/download/v${CT_ZLIB_VERSION}/ https://www.zlib.net/ https://www.zlib.net/fossils/"
 CT_ZLIB_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ZLIB_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ZLIB_ARCHIVE_FORMATS=".tar.xz .tar.gz"
diff --git a/relenv/_toolchain/x86_64/x86_64-linux-gnu-ct-ng.config b/relenv/_toolchain/x86_64/x86_64-linux-gnu-ct-ng.config
index 80b64b69..98e9b281 100644
--- a/relenv/_toolchain/x86_64/x86_64-linux-gnu-ct-ng.config
+++ b/relenv/_toolchain/x86_64/x86_64-linux-gnu-ct-ng.config
@@ -762,7 +762,7 @@ CT_ZLIB_SRC_RELEASE=y
 CT_ZLIB_PATCH_ORDER="global"
 CT_ZLIB_V_1_2_12=y
 CT_ZLIB_VERSION="1.2.13"
-CT_ZLIB_MIRRORS="http://downloads.sourceforge.net/project/libpng/zlib/${CT_ZLIB_VERSION} https://www.zlib.net/"
+CT_ZLIB_MIRRORS="https://github.com/madler/zlib/releases/download/v${CT_ZLIB_VERSION}/ https://www.zlib.net/ https://www.zlib.net/fossils/"
 CT_ZLIB_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ZLIB_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ZLIB_ARCHIVE_FORMATS=".tar.xz .tar.gz"