diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 69c84a81..117b428f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -57,7 +57,7 @@ jobs:
     env:
       API_HOST: 127.0.0.1
       API_PORT: 3000
-      PROMETHEUS_PORT: 9154
+      PROMETHEUS_PORT: 9153
       PGHOST: 127.0.0.1
       PGPORT: 5432
       PGUSER: postgres
diff --git a/src/env.ts b/src/env.ts
index decc840d..bb04957f 100644
--- a/src/env.ts
+++ b/src/env.ts
@@ -28,7 +28,7 @@ const schema = Type.Object({
   /** Hostname that will be reported to the chainhook node so it can call us back with events */
   EXTERNAL_HOSTNAME: Type.String({ default: '127.0.0.1' }),
   /** Port in which to serve prometheus metrics */
-  PROMETHEUS_PORT: Type.Number({ default: 9154 }),
+  PROMETHEUS_PORT: Type.Number({ default: 9153 }),
   /** Port in which to serve the profiler */
   PROFILER_PORT: Type.Number({ default: 9119 }),