diff --git a/configs/busybox-minimal.config b/configs/busybox-minimal.config
index 6fb347b8..b5cbe228 100644
--- a/configs/busybox-minimal.config
+++ b/configs/busybox-minimal.config
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: do not edit
-# Busybox version: 1.30.1
-# Mon Feb 25 01:30:01 2019
+# Busybox version: 1.31.1
+# Tue Dec  3 01:31:01 2019
 #
 CONFIG_HAVE_DOT_CONFIG=y
 
@@ -34,6 +34,7 @@ CONFIG_FEATURE_SUID=y
 CONFIG_BUSYBOX_EXEC_PATH="/proc/self/exe"
 # CONFIG_SELINUX is not set
 # CONFIG_FEATURE_CLEAN_UP is not set
+CONFIG_FEATURE_SYSLOG_INFO=y
 CONFIG_FEATURE_SYSLOG=y
 CONFIG_PLATFORM_LINUX=y
 
@@ -236,7 +237,6 @@ CONFIG_EXPR=y
 # CONFIG_FACTOR is not set
 CONFIG_FALSE=y
 # CONFIG_FOLD is not set
-# CONFIG_FSYNC is not set
 CONFIG_HEAD=y
 # CONFIG_FEATURE_FANCY_HEAD is not set
 # CONFIG_HOSTID is not set
@@ -303,6 +303,7 @@ CONFIG_STTY=y
 # CONFIG_SUM is not set
 CONFIG_SYNC=y
 # CONFIG_FEATURE_SYNC_FANCY is not set
+# CONFIG_FSYNC is not set
 # CONFIG_TAC is not set
 CONFIG_TAIL=y
 CONFIG_FEATURE_FANCY_TAIL=y
@@ -635,6 +636,7 @@ CONFIG_FEATURE_MDEV_RENAME=y
 CONFIG_FEATURE_MDEV_RENAME_REGEXP=y
 CONFIG_FEATURE_MDEV_EXEC=y
 CONFIG_FEATURE_MDEV_LOAD_FIRMWARE=y
+CONFIG_FEATURE_MDEV_DAEMON=y
 # CONFIG_MESG is not set
 # CONFIG_FEATURE_MESG_ENABLE_ONLY_GROUP is not set
 # CONFIG_MKE2FS is not set
@@ -778,6 +780,7 @@ CONFIG_FLASH_UNLOCK=y
 # CONFIG_I2CSET is not set
 # CONFIG_I2CDUMP is not set
 # CONFIG_I2CDETECT is not set
+# CONFIG_I2CTRANSFER is not set
 # CONFIG_INOTIFYD is not set
 # CONFIG_LESS is not set
 CONFIG_FEATURE_LESS_MAXLINES=0
@@ -811,6 +814,7 @@ CONFIG_PARTPROBE=y
 # CONFIG_SETSERIAL is not set
 CONFIG_STRINGS=y
 CONFIG_TIME=y
+# CONFIG_TS is not set
 # CONFIG_TTYSIZE is not set
 CONFIG_UBIRENAME=y
 # CONFIG_UBIATTACH is not set
@@ -938,6 +942,7 @@ CONFIG_TELNETD=y
 # CONFIG_FEATURE_TELNETD_INETD_WAIT is not set
 # CONFIG_TFTP is not set
 # CONFIG_FEATURE_TFTP_PROGRESS_BAR is not set
+# CONFIG_FEATURE_TFTP_HPA_COMPAT is not set
 # CONFIG_TFTPD is not set
 # CONFIG_FEATURE_TFTP_GET is not set
 # CONFIG_FEATURE_TFTP_PUT is not set
@@ -1147,6 +1152,7 @@ CONFIG_ASH_GETOPTS=y
 #
 CONFIG_FEATURE_SH_MATH=y
 CONFIG_FEATURE_SH_MATH_64=y
+CONFIG_FEATURE_SH_MATH_BASE=y
 CONFIG_FEATURE_SH_EXTRA_QUIET=y
 # CONFIG_FEATURE_SH_STANDALONE is not set
 # CONFIG_FEATURE_SH_NOFORK is not set
diff --git a/make/target-tools.mk b/make/target-tools.mk
index 32502181..d9ddde90 100644
--- a/make/target-tools.mk
+++ b/make/target-tools.mk
@@ -3,7 +3,7 @@
 #
 # -----------------------------------------------------------------------------
 
-BUSYBOX_VER    = 1.30.1
+BUSYBOX_VER    = 1.31.1
 BUSYBOX_TMP    = busybox-$(BUSYBOX_VER)
 BUSYBOX_SOURCE = busybox-$(BUSYBOX_VER).tar.bz2
 BUSYBOX_URL    = https://busybox.net/downloads