diff --git a/config/corne.conf b/config/corne.conf
index 7c59bf9..193de5d 100644
--- a/config/corne.conf
+++ b/config/corne.conf
@@ -117,12 +117,12 @@ CONFIG_ZMK_KSCAN_DEBOUNCE_RELEASE_MS=5
 # ref: https://zmk.dev/docs/config/system#hid
 CONFIG_ZMK_HID_CONSUMER_REPORT_USAGES_BASIC=y
 
-### STENO ENGINE (split-dict: partition across both halves)
+### STENO ENGINE (v4 union split-section: both dicts, both halves)
 CONFIG_STENO_ENGINE=y
-CONFIG_STENO_DICT_PLOVER=y
+CONFIG_STENO_DICT_BOTH=y
 CONFIG_STENO_SPLIT_DICT=y
-CONFIG_STENO_DICT_LEFT_MAX_SIZE=153600
-CONFIG_STENO_DICT_RIGHT_MAX_SIZE=512000
+CONFIG_STENO_DICT_LEFT_MAX_SIZE=440320
+CONFIG_STENO_DICT_RIGHT_MAX_SIZE=511000
 
 ### DEBUG OPTIONS
 # CONFIG_ZMK_USB_LOGGING=y