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 5d5f461..e4fffa5 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ 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 7df5830..311466d 100644
--- a/package.json
+++ b/package.json
@@ -40,5 +40,8 @@
     "js-yaml": "^4.1.0",
     "jsdom": "^16.6.0",
     "matrix-bot-sdk": "^v0.6.0-beta.4"
+  },
+  "engines": {
+    "node": ">=14.0.0"
   }
 }
diff --git a/src/report/ReportManager.ts b/src/report/ReportManager.ts
index 0b7c66e..74fd124 100644
--- a/src/report/ReportManager.ts
+++ b/src/report/ReportManager.ts
@@ -142,6 +142,11 @@ export class ReportManager {
         let initialNoticeReport: IReport | undefined, confirmationReport: IReportWithAction | undefined;
         try {
             let originalEvent = await this.mjolnir.client.getEvent(roomId, relation.event_id);
+            if (originalEvent.sender !== await this.mjolnir.client.getUserId()) {
+                // Let's not handle reactions to events we didn't send as
+                // some setups have two or more Mjolnir's in the same management room.
+                return;
+            }
             if (!("content" in originalEvent)) {
                 return;
             }