diff --git a/setup-etcd-env.sh b/setup-etcd-env.sh
index 01ad1f31e..97fe05714 100755
--- a/setup-etcd-env.sh
+++ b/setup-etcd-env.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 set -eux
 if [ -z "$(which etcd)" ]; then
-    ETCD_VERSION=3.4.27
+    ETCD_VERSION=${ETCD_VERSION:-3.4.27}
     case `uname -s` in
         Darwin)
             OS=darwin
diff --git a/tox.ini b/tox.ini
index 0017ca7f6..50b4c85b6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -27,6 +27,8 @@ commands =
 allowlist_externals =
   find
   ./setup-etcd-env.sh
+passenv =
+  ETCD_VERSION
 
 [testenv:update-states]
 deps =