diff --git a/Dockerfile b/Dockerfile
index 1948299..08781f0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:alpine
+FROM node:14-alpine
 COPY . /tmp/src
 RUN cd /tmp/src \
     && yarn install \
diff --git a/README.md b/README.md
index 690d51a..6fa7faf 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ docker run --rm -it -v /etc/mjolnir:/data matrixdotorg/mjolnir:latest
 
 ## Build it (alternative installation)
 
-This bot requires `yarn` and Node 10.
+This bot requires `yarn` and Node 14.
 
 ```bash
 git clone https://github.com/matrix-org/mjolnir.git
diff --git a/package.json b/package.json
index 70ebb17..0fe933b 100644
--- a/package.json
+++ b/package.json
@@ -39,5 +39,8 @@
     "js-yaml": "^4.1.0",
     "jsdom": "^16.6.0",
     "matrix-bot-sdk": "^0.5.19"
+  },
+  "engines": {
+    "node": ">=14.0.0"
   }
 }