diff --git a/src/Makefile b/src/Makefile
index 5c3efc7..8c03434 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -13,7 +13,7 @@ DEPDIR := .deps
 DEPFLAGS = -MT $@ -MMD -MP -MF $(DEPDIR)/$*.d
 
 CFLAGS ?= -ggdb -fno-omit-frame-pointer -fPIE -O2
-CFLAGS += -Wall -Werror -D_FORTIFY_SOURCE=2
+CFLAGS += -Wall -Werror -D_FORTIFY_SOURCE=3
 CFLAGS += -DVERSION=\"$(VERSION)\"
 CFLAGS += -Wno-error=deprecated-declarations
 
diff --git a/vu.b4.alsa-scarlett-gui.yml b/vu.b4.alsa-scarlett-gui.yml
index 1075a34..786523c 100644
--- a/vu.b4.alsa-scarlett-gui.yml
+++ b/vu.b4.alsa-scarlett-gui.yml
@@ -1,6 +1,6 @@
 app-id: vu.b4.alsa-scarlett-gui
 runtime: org.gnome.Platform
-runtime-version: "45"
+runtime-version: "47"
 sdk: org.gnome.Sdk
 command: alsa-scarlett-gui
 build-options: