diff --git a/configs/czechlight_clearfog_defconfig b/configs/czechlight_clearfog_defconfig
index 20781b2..09151d9 100644
--- a/configs/czechlight_clearfog_defconfig
+++ b/configs/czechlight_clearfog_defconfig
@@ -52,6 +52,7 @@
 BR2_PACKAGE_LIBGPIOD_TOOLS=y
 BR2_PACKAGE_NETOPEER2=y
 BR2_PACKAGE_NETOPEER2_CLI=y
+BR2_PACKAGE_NGHTTP2_MRUBY=y
 BR2_PACKAGE_ELFUTILS=y
 BR2_PACKAGE_LIBUNWIND=y
 BR2_PACKAGE_LINUX_PAM=y
diff --git a/submodules/buildroot b/submodules/buildroot
index acfd253..473753e 160000
--- a/submodules/buildroot
+++ b/submodules/buildroot
@@ -1 +1 @@
-Subproject commit acfd253eadcbcb9453dd66b0b45262c89a899b02
+Subproject commit 473753ed36d0ea2870f6a57d95e713fe8e17b350