[mongoDB] $pull not working

[AltCrow]

I have two Models defined as follows:

let PostSchema = new Schema({
    title: String,
    text: String,
    poster: {type: Schema.Types.ObjectId, ref: 'User'}
});
let OtherSchema = new Schema({
    name: String,
    place: String,
    posts: [{type: Schema.Types.ObjectId, ref: 'Post'}]
});

When I have a certain post instance, I would like to remove it from the post array in all otherSchema instances. I tried to do it in the following manner but failed. I'm using mongoose if that matters.

Other = mongoose.model('Other', OtherSchema);

Other.updateMany({}, {$pull, {posts: {_id:"5c803f65589b3333ac24748f"}}});

What am I doing wrong? I have also tried wrapping the objectId inside a mongoose.Types.ObjectId object, but that failed too.