Pulumi: error transport is closing

I recently got this error in Pulumi when executing pulumi up. This happened after upgrading to the newer version, from 3.26.0 to 3.27.0

aws:lambda:Permission:
    error: connection error: desc = "transport: Error while dialing dial tcp 127.0.0.1:52118: connect: connection refused"

aws:lambda:Function:
  error: connection error: desc = "transport: Error while dialing dial tcp 127.0.0.1:52118: connect: connection refused"

aws:lambda:Function:
  error: transport is closing

pulumi:pulumi:Stack:
  panic: interface conversion: interface {} is []interface {}, not *schema.Set
  goroutine 229 [running]:
  github.com/terraform-providers/terraform-provider-aws/aws.resourceAwsLambdaFunctionUpdate(0xc002279280, 0x7955220, 0xc001b44c00, 0x0, 0x0)
      /home/runner/go/pkg/mod/github.com/pulumi/terraform-provider-aws@v1.38.1-0.20211004122636-8966d24576a0/aws/resource_aws_lambda_function.go:1199 +0x522d

See the screenshot below from my terminal

Investigation

The noticeable error from above was regarding this message

panic: interface conversion: interface {} is []interface {}, not *schema.Set
  goroutine 229 [running]:
  ...

I was wondering why that happens 🤔 . It was definitely related to golang (it mentioned goroutine). I tried these solutions below but it didn't solve the problem:

Reinstalled golang via homebrew ❌
Reinstalled pulumi via homebrew ❌
Restarted the computers ❌

Solution

Then I noticed that maybe the @pulumi/pulumi packages also need to be upgraded.

These below were the previous versions. See that @pulumi/pulumi version 3.13.2 was slightly behind the pulumi CLI version 3.27.0

package.json

"@pulumi/aws": "4.23.0",
"@pulumi/awsx": "0.33.0",
"@pulumi/pulumi": "3.13.2",

I uninstalled all of them.

npm uninstall @pulumi/aws
npm uninstall @pulumi/awsx
npm uninstall @pulumi/pulumi

Then I installed the new ones (I specified them as devDependencies)

npm install -D @pulumi/aws
npm install -D @pulumi/awsx
npm install -D @pulumi/pulumi

I got these versions

package.json

"@pulumi/aws": "^5.1.0",
"@pulumi/awsx": "^0.40.0",
"@pulumi/pulumi": "^3.27.0"

Running pulumi up worked again 🎉 🥳