diff --git a/Makefile b/Makefile
index ae645f4b2..7606e1cfb 100644
--- a/Makefile
+++ b/Makefile
@@ -90,14 +90,14 @@ build/%.woff: build/%.ttf
 
 
 # Master UFOs -> variable TTF
-$(FONTDIR)/var/%.var.ttf: src/%.designspace $(all_ufo_masters)
+$(FONTDIR)/var/%.var.ttf: src/%.designspace $(all_ufo_masters) version.txt
 	misc/fontbuild compile-var -o $@ $(FONTBUILD_FLAGS) $<
 
 # Instance UFO -> OTF, TTF (note: masters' rules in generated.make)
-$(FONTDIR)/const/Inter-%.otf: build/ufo/Inter-%.ufo
+$(FONTDIR)/const/Inter-%.otf: build/ufo/Inter-%.ufo version.txt
 	misc/fontbuild compile -o $@ $(FONTBUILD_FLAGS) $<
 
-$(FONTDIR)/const/Inter-%.ttf: build/ufo/Inter-%.ufo
+$(FONTDIR)/const/Inter-%.ttf: build/ufo/Inter-%.ufo version.txt
 	misc/fontbuild compile -o $@ $(FONTBUILD_FLAGS) $<