diff --git a/.env.development b/.env.development
index 4f613c70..ceac1712 100644
--- a/.env.development
+++ b/.env.development
@@ -1,6 +1,6 @@
 NEXT_PUBLIC_API_SERVER_PATH="http://1.248.227.176:38080"
 
-NEXT_PUBLIC_HOST_URL="http://1.248.227.176:4000"
+NEXT_PUBLIC_HOST_URL="//1.248.227.176:4000"
 
 SESSION_SECRET="i3iHH1yp2/2SpQSIySQ4bpyc4g0D+zCF9FAn5xUG0+Y="
 
diff --git a/.env.production b/.env.production
index f0951f7a..767c3e4b 100644
--- a/.env.production
+++ b/.env.production
@@ -1,6 +1,6 @@
 NEXT_PUBLIC_API_SERVER_PATH="https://api.hanasys.jp/"
 
-NEXT_PUBLIC_HOST_URL="http://1.248.227.176:4000"
+NEXT_PUBLIC_HOST_URL="//1.248.227.176:4000"
 
 SESSION_SECRET="i3iHH1yp2/2SpQSIySQ4bpyc4g0D+zCF9FAn5xUG0+Y="