diff --git a/Makefile b/Makefile
index 64bb0b57a..006d32471 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,15 @@
 SHELL := /bin/bash
-PYVER := 3.6
-VENV := ./env$(PYVER)
 
 ifndef SPACY_EXTRAS
 override SPACY_EXTRAS = spacy-lookups-data jieba pkuseg==0.0.25 sudachipy sudachidict_core
 endif
 
+ifndef PYVER
+override PYVER = 3.6
+endif
+
+VENV := ./env$(PYVER)
+
 version := $(shell "bin/get-version.sh")
 package := $(shell "bin/get-package.sh")