diff --git a/README.md b/README.md
index e4a98cb..19f501e 100644
--- a/README.md
+++ b/README.md
@@ -4,9 +4,7 @@ Static Windows (x86_64) and Linux (x86_64) Builds of ffmpeg master and latest re
 
 Windows builds are targetting Windows 7 and newer.
 
-Linux (x86_64) builds are targetting Ubuntu 16.04 (glibc-2.23 + linux-4.4) and anything more recent.
-
-Linux (arm64) builds are targetting Ubuntu 18.04 (glibc-2.27 + linux-4.15) and anything more recent.
+Linux builds are targetting Ubuntu 18.04 (glibc-2.27 + linux-4.15) and anything more recent.
 
 ## Auto-Builds
 
@@ -47,7 +45,7 @@ On success, the resulting zip file will be in the `artifacts` subdir.
 Available targets:
 * `win64` (x86_64 Windows)
 * `win32` (x86 Windows)
-* `linux64` (x86_64 Linux, glibc>=2.23, linux>=4.4)
+* `linux64` (x86_64 Linux, glibc>=2.27, linux>=4.15)
 * `linuxarm64` (arm64 (aarch64) Linux, glibc>=2.27, linux>=4.15)
 
 The linuxarm64 target will not build some dependencies due to lack of arm64 (aarch64) architecture support or cross-compiling restrictions.
diff --git a/images/base-linux64/ct-ng-config b/images/base-linux64/ct-ng-config
index dbb6f81..0f164fe 100644
--- a/images/base-linux64/ct-ng-config
+++ b/images/base-linux64/ct-ng-config
@@ -292,14 +292,14 @@ CT_LINUX_PATCH_ORDER="global"
 # CT_LINUX_V_4_18 is not set
 # CT_LINUX_V_4_17 is not set
 # CT_LINUX_V_4_16 is not set
-# CT_LINUX_V_4_15 is not set
+CT_LINUX_V_4_15=y
 # CT_LINUX_V_4_14 is not set
 # CT_LINUX_V_4_13 is not set
 # CT_LINUX_V_4_12 is not set
 # CT_LINUX_V_4_11 is not set
 # CT_LINUX_V_4_10 is not set
 # CT_LINUX_V_4_9 is not set
-CT_LINUX_V_4_4=y
+# CT_LINUX_V_4_4 is not set
 # CT_LINUX_V_4_1 is not set
 # CT_LINUX_V_3_18 is not set
 # CT_LINUX_V_3_16 is not set
@@ -308,8 +308,7 @@ CT_LINUX_V_4_4=y
 # CT_LINUX_V_3_10 is not set
 # CT_LINUX_V_3_4 is not set
 # CT_LINUX_V_3_2 is not set
-# CT_LINUX_V_2_6_32 is not set
-CT_LINUX_VERSION="4.4.302"
+CT_LINUX_VERSION="4.15.18"
 CT_LINUX_MIRRORS="$(CT_Mirrors kernel.org linux ${CT_LINUX_VERSION})"
 CT_LINUX_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_LINUX_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
@@ -323,12 +322,13 @@ CT_LINUX_5_5_or_older=y
 CT_LINUX_older_than_5_5=y
 CT_LINUX_5_3_or_older=y
 CT_LINUX_older_than_5_3=y
-CT_LINUX_4_8_or_older=y
-CT_LINUX_older_than_4_8=y
+CT_LINUX_later_than_4_8=y
+CT_LINUX_4_8_or_later=y
 CT_LINUX_later_than_3_7=y
 CT_LINUX_3_7_or_later=y
 CT_LINUX_later_than_3_2=y
 CT_LINUX_3_2_or_later=y
+CT_LINUX_REQUIRE_3_2_or_later=y
 CT_KERNEL_DEP_RSYNC=y
 CT_KERNEL_LINUX_VERBOSITY_0=y
 # CT_KERNEL_LINUX_VERBOSITY_1 is not set
@@ -457,14 +457,14 @@ CT_GLIBC_PATCH_ORDER="global"
 # CT_GLIBC_V_2_30 is not set
 # CT_GLIBC_V_2_29 is not set
 # CT_GLIBC_V_2_28 is not set
-# CT_GLIBC_V_2_27 is not set
+CT_GLIBC_V_2_27=y
 # CT_GLIBC_V_2_26 is not set
 # CT_GLIBC_V_2_25 is not set
 # CT_GLIBC_V_2_24 is not set
-CT_GLIBC_V_2_23=y
+# CT_GLIBC_V_2_23 is not set
 # CT_GLIBC_V_2_19 is not set
 # CT_GLIBC_V_2_17 is not set
-CT_GLIBC_VERSION="2.23"
+CT_GLIBC_VERSION="2.27"
 CT_GLIBC_MIRRORS="$(CT_Mirrors GNU glibc)"
 CT_GLIBC_ARCHIVE_FILENAME="@{pkg_name}-@{version}"
 CT_GLIBC_ARCHIVE_DIRNAME="@{pkg_name}-@{version}"
@@ -484,16 +484,16 @@ CT_GLIBC_2_29_or_older=y
 CT_GLIBC_older_than_2_29=y
 CT_GLIBC_2_28_or_older=y
 CT_GLIBC_older_than_2_28=y
+CT_GLIBC_2_27_or_later=y
 CT_GLIBC_2_27_or_older=y
-CT_GLIBC_older_than_2_27=y
-CT_GLIBC_2_26_or_older=y
-CT_GLIBC_older_than_2_26=y
-CT_GLIBC_2_25_or_older=y
-CT_GLIBC_older_than_2_25=y
-CT_GLIBC_2_24_or_older=y
-CT_GLIBC_older_than_2_24=y
+CT_GLIBC_later_than_2_26=y
+CT_GLIBC_2_26_or_later=y
+CT_GLIBC_later_than_2_25=y
+CT_GLIBC_2_25_or_later=y
+CT_GLIBC_later_than_2_24=y
+CT_GLIBC_2_24_or_later=y
+CT_GLIBC_later_than_2_23=y
 CT_GLIBC_2_23_or_later=y
-CT_GLIBC_2_23_or_older=y
 CT_GLIBC_later_than_2_20=y
 CT_GLIBC_2_20_or_later=y
 CT_GLIBC_later_than_2_17=y
@@ -506,6 +506,7 @@ CT_GLIBC_DEP_GCC=y
 CT_GLIBC_DEP_PYTHON=y
 CT_GLIBC_SPARC_ALLOW_V7=y
 CT_THREADS="nptl"
+CT_GLIBC_BUILD_SSP=y
 CT_GLIBC_HAS_LIBIDN_ADDON=y
 # CT_GLIBC_USE_LIBIDN_ADDON is not set
 CT_GLIBC_NO_SPARC_V8=y
@@ -523,7 +524,12 @@ CT_GLIBC_FORCE_UNWIND=y
 # CT_GLIBC_KERNEL_VERSION_NONE is not set
 CT_GLIBC_KERNEL_VERSION_AS_HEADERS=y
 # CT_GLIBC_KERNEL_VERSION_CHOSEN is not set
-CT_GLIBC_MIN_KERNEL="4.4.302"
+CT_GLIBC_MIN_KERNEL="4.15.18"
+CT_GLIBC_SSP_DEFAULT=y
+# CT_GLIBC_SSP_NO is not set
+# CT_GLIBC_SSP_YES is not set
+# CT_GLIBC_SSP_ALL is not set
+# CT_GLIBC_SSP_STRONG is not set
 CT_GLIBC_ENABLE_COMMON_FLAG=y
 CT_ALL_LIBC_CHOICES="AVR_LIBC GLIBC MINGW_W64 MOXIEBOX MUSL NEWLIB NONE UCLIBC_NG"
 CT_LIBC_SUPPORT_THREADS_ANY=y
@@ -606,6 +612,7 @@ CT_GCC_later_than_5=y
 CT_GCC_5_or_later=y
 CT_GCC_later_than_4_9=y
 CT_GCC_4_9_or_later=y
+CT_GCC_REQUIRE_4_9_or_later=y
 CT_CC_GCC_ENABLE_PLUGINS=y
 CT_CC_GCC_HAS_LIBMPX=y
 CT_CC_GCC_ENABLE_CXX_FLAGS=""