diff --git a/Dockerfile b/Dockerfile
index 1bcfb83..84d7d06 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:12
+FROM node:12.22.12-bullseye-slim
 
 
 # Update apt and install wget
diff --git a/src/config.js b/src/config.js
index db0a478..baf53c2 100644
--- a/src/config.js
+++ b/src/config.js
@@ -97,7 +97,10 @@ export function getConfig() {
   }
   if (process.env.BLOCKSTACK_API_URL) {
     bskConfig.network.blockstackAPIUrl = process.env.BLOCKSTACK_API_URL
-    bskConfig.network.coreApiUrl = process.env.BLOCKSTACK_API_URL
+  }
+
+  if (process.env.BLOCKSTACK_CORE_URL) {
+    bskConfig.network.coreApiUrl = process.env.BLOCKSTACK_CORE_URL
   }
 
   config.winstonConfig = {