diff --git a/ports/zephyr/Kconfig b/ports/zephyr/Kconfig
index 5545cf3b15b0..227e943bcd13 100644
--- a/ports/zephyr/Kconfig
+++ b/ports/zephyr/Kconfig
@@ -30,7 +30,7 @@ config MICROPY_CONFIGFILE
 
 config MICROPY_HEAP_SIZE
 	int "Heap size"
-	default 16384
+	default 49152
 
 config MICROPY_VFS_FAT
 	bool "FatFS file system"
diff --git a/ports/zephyr/prj_minimal.conf b/ports/zephyr/prj_minimal.conf
index 2c89a02fae26..6c850751d723 100644
--- a/ports/zephyr/prj_minimal.conf
+++ b/ports/zephyr/prj_minimal.conf
@@ -11,3 +11,5 @@ CONFIG_CONSOLE_PUTCHAR_BUFSIZE=32
 # TODO: Disable once https://github.com/zephyrproject-rtos/zephyr/pull/13731 is merged
 #CONFIG_CONSOLE=n
 #CONFIG_UART_CONSOLE=n
+
+CONFIG_MICROPY_HEAP_SIZE=16384