diff --git a/Makefile b/Makefile
index 52098c702..fa3054ae4 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,10 @@ STMHAL_BUILD_DIR=vendor/micropython/stmhal/build-TREZORV2
 help: ## show this help
 	@awk 'BEGIN {FS = ":.*?## "} /^[a-zA-Z_-]+:.*?## / {printf "\033[36mmake %-15s\033[0m %s\n", $$1, $$2}' $(MAKEFILE_LIST)
 
-build: build_stmhal build_unix ## build both stmhal and unix micropython ports
+submodule_update: ## update git submodules
+	git submodule update
+
+build: submodule_update build_stmhal build_unix ## build both stmhal and unix micropython ports
 
 build_stmhal: ## build stmhal port
 	make -C vendor/micropython/stmhal
diff --git a/emu.sh b/emu.sh
index 043893325..1a873bbfe 100755
--- a/emu.sh
+++ b/emu.sh
@@ -1,4 +1,4 @@
 #!/bin/bash
 cd `dirname $0`/src
 
-../vendor/micropython/unix/micropython -O0 -X heapsize=100000 main.py
+../vendor/micropython/unix/micropython -i -O0 -X heapsize=100000 main.py
diff --git a/vendor/micropython b/vendor/micropython
index ab1072883..168d1e35d 160000
--- a/vendor/micropython
+++ b/vendor/micropython
@@ -1 +1 @@
-Subproject commit ab1072883ffbac8610f53e75a826f6fac9780106
+Subproject commit 168d1e35d1536ce30bdf793d7f8b117a970f1279