diff --git a/README.md b/README.md
index d1c9d50..54ade64 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@
 # Deployment instructions
 It's recommended to deploy this to AWS as it's completely free for this use case.
 1. Sign up for an AWS account
-2. Create a Lambda function, make sure you select `go 1.x` as the runtime
+2. Create a Lambda function, make sure you select `Custom runtime on Amazon Linux 2` as the runtime
 3. Change the handler to `bootstrap`
 4. Make sure the input is set to Event Bridge with the following settings (change the cron expression depending on how often you want this to run - if you aren't familiar with cron expressions, check out https://crontab.guru):
 
diff --git a/build.sh b/build.sh
index f1f0650..20aeb47 100755
--- a/build.sh
+++ b/build.sh
@@ -1,4 +1,4 @@
 rm lambda-handler.zip 2>/dev/null
-GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o bootstrap ./cmd/lambda/main.go
+GOOS=linux GOARCH=arm64 CGO_ENABLED=0 go build -o bootstrap ./cmd/lambda/main.go
 zip lambda-handler.zip bootstrap
 rm bootstrap
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