diff --git a/Makefile b/Makefile
index 05ba08cc..b5b92661 100644
--- a/Makefile
+++ b/Makefile
@@ -20,7 +20,7 @@ $(CALENDAR_DIR):
 	mkdir -p $(CALENDAR_DIR)
 
 $(CALENDAR_DIR)/%.ics: calendars/%.yaml $(CALENDAR_DIR)
-	yaml2ics $< > $@
+	python -m yaml2ics $< > $@
 
 CALENDAR_SOURCES = $(wildcard calendars/*.yaml)
 calendars: $(subst calendars,$(CALENDAR_DIR),$(CALENDAR_SOURCES:.yaml=.ics))
diff --git a/requirements.txt b/requirements.txt
index 89ba95c6..4148c2b5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
 pre-commit==4.5.0
-yaml2ics==0.3rc0
+yaml2ics==0.3