diff --git a/README.adoc b/README.adoc
index a957267..7893e5e 100644
--- a/README.adoc
+++ b/README.adoc
@@ -1,5 +1,5 @@
 = Linux Kernel Module Cheat
-:description: The perfect emulation setup to study and develop the <<linux-kernel>> v5.2.1, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 18.04 host.
+:description: The perfect emulation setup to study and develop the <<linux-kernel>> v5.4.3, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 19.10 host.
 :idprefix:
 :idseparator: -
 :nofooter:
diff --git a/buildroot_config/default b/buildroot_config/default
index 1876ce3..c39980b 100644
--- a/buildroot_config/default
+++ b/buildroot_config/default
@@ -1,3 +1,7 @@
+## Non-default versions of our submodules.
+#BR2_BINUTILS_VERSION_2_32_X=y
+#BR2_GCC_VERSION_9_X=y
+
 # Toolchain options.
 # Enable as much visibility as possible.
 BR2_CCACHE=y
@@ -41,3 +45,7 @@ BR2_PACKAGE_HOST_DTC=y
 # such as /etc/network/interfaces which we need. So we just
 # remove the init.d file for now.
 #BR2_PACKAGE_IFUPDOWN_SCRIPTS=n
+
+# Buildroot 2019.11 automatically builds QEMU for qemu_x86_64_defconfig.
+# But we build our own.
+BR2_PACKAGE_HOST_QEMU=n
diff --git a/submodules/binutils-gdb b/submodules/binutils-gdb
index 1690de7..2d2ea78 160000
--- a/submodules/binutils-gdb
+++ b/submodules/binutils-gdb
@@ -1 +1 @@
-Subproject commit 1690de78a3603a3a0ab8487ef896e75871bb0737
+Subproject commit 2d2ea781e721d4b7a4ee0d3ca7fb5e2d76f88492
diff --git a/submodules/buildroot b/submodules/buildroot
index 653eaa1..157ac49 160000
--- a/submodules/buildroot
+++ b/submodules/buildroot
@@ -1 +1 @@
-Subproject commit 653eaa178bf7352791d988a8ee9db79c8bd7975e
+Subproject commit 157ac499cf7ae454ecc6942f97519e67d644ac0b
diff --git a/submodules/gcc b/submodules/gcc
index 9046071..2d7ded1 160000
--- a/submodules/gcc
+++ b/submodules/gcc
@@ -1 +1 @@
-Subproject commit 9046071dddb0a9ee7e30e5edf27cfc53b5b9c238
+Subproject commit 2d7ded160be9e819f2f51ff8e55d1c13beb343b7
diff --git a/submodules/glibc b/submodules/glibc
index 6c99e37..be9a328 160000
--- a/submodules/glibc
+++ b/submodules/glibc
@@ -1 +1 @@
-Subproject commit 6c99e37f6fb640a50a3113b2dbee5d5389843c1e
+Subproject commit be9a328c93834648e0bec106a1f86357d1a8c7e1
diff --git a/submodules/linux b/submodules/linux
index 527a3db..f7688b4 160000
--- a/submodules/linux
+++ b/submodules/linux
@@ -1 +1 @@
-Subproject commit 527a3db363a3bd7e6ae0a77da809e01847a9931c
+Subproject commit f7688b48ac46e9a669e279f1bc167722d5141eda
diff --git a/submodules/qemu b/submodules/qemu
index d8dae26..c508dc5 160000
--- a/submodules/qemu
+++ b/submodules/qemu
@@ -1 +1 @@
-Subproject commit d8dae268c0a3e4e361002aca3b382fedd77f2567
+Subproject commit c508dc5e08c6f3237d57133e35951a02006f6c41