diff --git a/mock-api/restServer.ts b/mock-api/restServer.ts
index 1291bc023..22e2c72b3 100644
--- a/mock-api/restServer.ts
+++ b/mock-api/restServer.ts
@@ -141,7 +141,7 @@ let DEV_VERSION_IS_UPGRADEABLE: boolean;
 let STABLE_VERSION_IS_UPGRADEABLE: boolean;
 let THIS_VERSION: string;
 let LATEST_STABLE_VERSION = '3.8.2';
-let LATEST_DEV_VERSION = '3.8.3-dev.2';
+let LATEST_DEV_VERSION = '3.9.0-dev.1';
 
 // scenarios for testing versioning
 // let version_test = 0; // on latest stable, or switch to dev
diff --git a/src/web/WebStatusService.cpp b/src/web/WebStatusService.cpp
index 43800486e..ee3cadb68 100644
--- a/src/web/WebStatusService.cpp
+++ b/src/web/WebStatusService.cpp
@@ -363,9 +363,9 @@ void WebStatusService::getVersions(JsonObject root) {
     stable_out["upgradeable"] = FirmwareVersion("3.8.2") > current_version;
 
     JsonObject dev_out     = root["dev"].to<JsonObject>();
-    dev_out["version"]     = "3.8.3-dev.2";
+    dev_out["version"]     = "3.9.0-dev.1";
     dev_out["date"]        = "2026-04-25";
-    dev_out["upgradeable"] = FirmwareVersion("3.8.3-dev.2") > current_version;
+    dev_out["upgradeable"] = FirmwareVersion("3.9.0-dev.1") > current_version;
 #endif
 }