diff --git a/go/go.mod b/go/go.mod
index fdb8e1c..459ffb6 100644
--- a/go/go.mod
+++ b/go/go.mod
@@ -1,6 +1,6 @@
 module go-app
 
-go 1.16
+go 1.17
 
 require (
 	github.com/gin-gonic/gin v1.7.3
@@ -10,8 +10,17 @@ require (
 	github.com/mattn/go-isatty v0.0.13 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.1 // indirect
-	github.com/ugorji/go v1.2.6 // indirect
 	golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e // indirect
 	google.golang.org/protobuf v1.27.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 )
+
+require (
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-playground/locales v0.14.0 // indirect
+	github.com/go-playground/universal-translator v0.18.0 // indirect
+	github.com/leodido/go-urn v1.2.1 // indirect
+	github.com/ugorji/go/codec v1.2.6 // indirect
+	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect
+	golang.org/x/text v0.3.6 // indirect
+)
diff --git a/node/Dockerfile b/node/Dockerfile
index 4d0288a..36a8eb6 100644
--- a/node/Dockerfile
+++ b/node/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:16.6.2-alpine
+FROM node:lts-alpine
 
 WORKDIR /app
 COPY package.json .
@@ -6,5 +6,3 @@ COPY yarn.lock .
 RUN yarn install
 COPY . .
 CMD node index.js
-
-
diff --git a/python/main.py b/python/main.py
index dbe9093..d254175 100644
--- a/python/main.py
+++ b/python/main.py
@@ -6,10 +6,10 @@ app = FastAPI()
 
 
 @app.get("/")
-def read_root():
+def read_root() -> dict:
     return {"Hello": "World"}
 
 
 @app.get("/items/{item_id}")
-def read_item(item_id: int, q: Optional[str] = None):
+def read_item(item_id: int, q: Optional[str] = None) -> dict:
     return {"item_id": item_id, "q": q}
diff --git a/react/Dockerfile b/react/Dockerfile
index 940fb7c..c8f44d7 100644
--- a/react/Dockerfile
+++ b/react/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:15.4 AS build
+FROM node:lts-alpine AS build
 
 WORKDIR /app
 COPY package.json .