diff --git a/backends/fastapi/cloudflared.compose.yml b/backends/fastapi/cloudflared.compose.yml
index 2d16833..c1c3b7c 100644
--- a/backends/fastapi/cloudflared.compose.yml
+++ b/backends/fastapi/cloudflared.compose.yml
@@ -25,8 +25,3 @@ services:
           cpus: '0.1'
           memory: 32M
     restart: unless-stopped
-
-networks:
-  backend:
-    external: true
-    name: ${APP_NAME:-fastapi-api}_backend
diff --git a/backends/fastapi/compose.yml b/backends/fastapi/compose.yml
index a37a7c9..e57615e 100644
--- a/backends/fastapi/compose.yml
+++ b/backends/fastapi/compose.yml
@@ -46,7 +46,7 @@ services:
     restart: unless-stopped
 
   db:
-    image: postgres:17-alpine
+    image: postgres:18-alpine
     container_name: ${APP_NAME:-fastapi-api}-db
     ports:
       - "${POSTGRES_HOST_PORT:-5500}:5432"
diff --git a/backends/fastapi/dev.compose.yml b/backends/fastapi/dev.compose.yml
index d3c876d..889edf3 100644
--- a/backends/fastapi/dev.compose.yml
+++ b/backends/fastapi/dev.compose.yml
@@ -41,7 +41,7 @@ services:
     restart: unless-stopped
 
   db:
-    image: postgres:17-alpine
+    image: postgres:18-alpine
     container_name: ${APP_NAME:-fastapi-api}-db-dev
     ports:
       - "${POSTGRES_HOST_PORT:-5501}:5432"
diff --git a/stacks/fastapi-react/cloudflared.compose.yml b/stacks/fastapi-react/cloudflared.compose.yml
index 7ed72e7..5e3e808 100644
--- a/stacks/fastapi-react/cloudflared.compose.yml
+++ b/stacks/fastapi-react/cloudflared.compose.yml
@@ -25,8 +25,3 @@ services:
           cpus: '0.1'
           memory: 32M
     restart: unless-stopped
-
-networks:
-  backend:
-    external: true
-    name: ${APP_NAME:-fastapi-react}_backend
diff --git a/stacks/fastapi-react/compose.yml b/stacks/fastapi-react/compose.yml
index 11cf798..1d3de7e 100644
--- a/stacks/fastapi-react/compose.yml
+++ b/stacks/fastapi-react/compose.yml
@@ -74,7 +74,7 @@ services:
     restart: unless-stopped
 
   db:
-    image: postgres:17-alpine
+    image: postgres:18-alpine
     container_name: ${APP_NAME:-fastapi-react}-db
     ports:
       - "${POSTGRES_HOST_PORT:-4426}:5432"
diff --git a/stacks/fastapi-react/dev.compose.yml b/stacks/fastapi-react/dev.compose.yml
index cd724b3..2417733 100644
--- a/stacks/fastapi-react/dev.compose.yml
+++ b/stacks/fastapi-react/dev.compose.yml
@@ -76,7 +76,7 @@ services:
     restart: unless-stopped
 
   db:
-    image: postgres:17-alpine
+    image: postgres:18-alpine
     container_name: ${APP_NAME:-fastapi-react}-db-dev
     ports:
       - "${POSTGRES_HOST_PORT:-4427}:5432"