diff --git a/src/main/java/app/Properties.java b/src/main/java/app/Properties.java
index ffb1e301..0a64353a 100644
--- a/src/main/java/app/Properties.java
+++ b/src/main/java/app/Properties.java
@@ -69,13 +69,19 @@ public Properties() throws IOException {
                 this.botDiscordId
         );
         this.wynnIconUrl = getProperty("wynnIconUrl");
-        this.guildBannerUrl = getProperty("guildBannerUrl");
+        this.guildBannerUrl = getEnv("GUILD_BANNER_URL", "https://wynn-guild-banner.toki317.dev/banners/");
 
         this.logTimeZone = TimeZone.getTimeZone(getProperty("logTimeZone"));
     }
 
     private String getEnv(String name) {
-        return System.getenv(name);
+        return getEnv(name, null);
+    }
+
+    private String getEnv(String name, String fallback) {
+        String value = System.getenv(name);
+        if (value == null) return fallback;
+        return value;
     }
 
     private int getEnvInt(String name, int fallback) {
diff --git a/src/main/resources/project.properties b/src/main/resources/project.properties
index 1245d5a1..42670ed6 100644
--- a/src/main/resources/project.properties
+++ b/src/main/resources/project.properties
@@ -4,7 +4,6 @@ botLogChannelsMax=4
 logTimeZone=Asia/Tokyo
 repositoryUrl=https://github.com/motoki317/moto-bot
 githubImagesUrl=https://motoki317.github.io/images/
-guildBannerUrl=https://wynn-guild-banner.herokuapp.com/banners/
 mainColor=#7FE3FD
 botServerInviteUrl=https://discord.gg/hdKfEeV
 wynnIconUrl=https://cdn.wynncraft.com/img/ico/favicon-96x96.png