diff --git a/linux-arm64-lts/crosstool-ng.config b/linux-arm64-lts/crosstool-ng.config
index 3852e54..0df7246 100644
--- a/linux-arm64-lts/crosstool-ng.config
+++ b/linux-arm64-lts/crosstool-ng.config
@@ -759,7 +759,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
diff --git a/linux-arm64/crosstool-ng.config b/linux-arm64/crosstool-ng.config
index b93dd38..fb8c2fd 100644
--- a/linux-arm64/crosstool-ng.config
+++ b/linux-arm64/crosstool-ng.config
@@ -757,7 +757,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
diff --git a/linux-armv5-musl/crosstool-ng.config b/linux-armv5-musl/crosstool-ng.config
index aa445e2..81fcc75 100755
--- a/linux-armv5-musl/crosstool-ng.config
+++ b/linux-armv5-musl/crosstool-ng.config
@@ -766,7 +766,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
diff --git a/linux-armv5/crosstool-ng.config b/linux-armv5/crosstool-ng.config
index b888b5f..ad1f5d6 100644
--- a/linux-armv5/crosstool-ng.config
+++ b/linux-armv5/crosstool-ng.config
@@ -771,7 +771,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
diff --git a/linux-armv6-lts/crosstool-ng.config b/linux-armv6-lts/crosstool-ng.config
index d7d2cc2..74be4cd 100644
--- a/linux-armv6-lts/crosstool-ng.config
+++ b/linux-armv6-lts/crosstool-ng.config
@@ -772,7 +772,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
diff --git a/linux-armv6/crosstool-ng.config b/linux-armv6/crosstool-ng.config
index a4306d6..42cb405 100644
--- a/linux-armv6/crosstool-ng.config
+++ b/linux-armv6/crosstool-ng.config
@@ -773,7 +773,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
diff --git a/linux-armv7/crosstool-ng.config b/linux-armv7/crosstool-ng.config
index 5e6b90e..1a2f08a 100644
--- a/linux-armv7/crosstool-ng.config
+++ b/linux-armv7/crosstool-ng.config
@@ -773,7 +773,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
diff --git a/linux-armv7a/crosstool-ng.config b/linux-armv7a/crosstool-ng.config
index 63121a8..fd3583b 100644
--- a/linux-armv7a/crosstool-ng.config
+++ b/linux-armv7a/crosstool-ng.config
@@ -773,7 +773,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
diff --git a/linux-m68k-uclibc/crosstool-ng.config b/linux-m68k-uclibc/crosstool-ng.config
index c7adcf2..d2e63f1 100644
--- a/linux-m68k-uclibc/crosstool-ng.config
+++ b/linux-m68k-uclibc/crosstool-ng.config
@@ -682,7 +682,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
diff --git a/linux-mips/crosstool-ng.config b/linux-mips/crosstool-ng.config
index 27736a8..e2aba0d 100644
--- a/linux-mips/crosstool-ng.config
+++ b/linux-mips/crosstool-ng.config
@@ -758,7 +758,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
diff --git a/linux-ppc64le/crosstool-ng.config b/linux-ppc64le/crosstool-ng.config
index 7d5dbdd..7a9926e 100644
--- a/linux-ppc64le/crosstool-ng.config
+++ b/linux-ppc64le/crosstool-ng.config
@@ -754,7 +754,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
diff --git a/linux-riscv32/crosstool-ng.config b/linux-riscv32/crosstool-ng.config
index f2a7d5a..1d3f281 100644
--- a/linux-riscv32/crosstool-ng.config
+++ b/linux-riscv32/crosstool-ng.config
@@ -798,7 +798,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
diff --git a/linux-riscv64/crosstool-ng.config b/linux-riscv64/crosstool-ng.config
index 1cf50bb..841f5dd 100644
--- a/linux-riscv64/crosstool-ng.config
+++ b/linux-riscv64/crosstool-ng.config
@@ -798,7 +798,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
diff --git a/linux-s390x/crosstool-ng.config b/linux-s390x/crosstool-ng.config
index c9b8a71..281ace5 100644
--- a/linux-s390x/crosstool-ng.config
+++ b/linux-s390x/crosstool-ng.config
@@ -721,7 +721,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
diff --git a/linux-xtensa-uclibc/crosstool-ng.config b/linux-xtensa-uclibc/crosstool-ng.config
index 2044cbd..212cd60 100644
--- a/linux-xtensa-uclibc/crosstool-ng.config
+++ b/linux-xtensa-uclibc/crosstool-ng.config
@@ -686,7 +686,7 @@ CT_ISL_V_0_24=y
 # CT_ISL_V_0_16 is not set
 # CT_ISL_V_0_15 is not set
 CT_ISL_VERSION="0.24"
-CT_ISL_MIRRORS="http://ftp.slackware.com/pub/slackware/slackware64-current/source/l/isl"
+CT_ISL_MIRRORS="https://libisl.sourceforge.io"
 CT_ISL_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
 CT_ISL_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"