diff --git a/README.md b/README.md
index 654c8348..bf2068d3 100644
--- a/README.md
+++ b/README.md
@@ -202,7 +202,7 @@ iex $cmd
 ## Setting up Certificate based authentication
 Perform the following steps to authenticate with a certificate instead of a username and password:
 
-1. Generate a certificate with an Extended Key Usage of Client Authentication and a Subject Alternative Name with the UPN of the user. See this [powershell function](https://github.com/WinRb/WinRM/blob/main/WinrmAppveyor.psm1#L1) as an example of using `openssl` to create a self signed user certificate in `.pem` and `.pfx` formats along with the private key file.
+1. Generate a certificate with an Extended Key Usage of Client Authentication and a Subject Alternative Name with the UPN of the user. e.g. using `openssl` to create a self signed user certificate in `.pem` and `.pfx` formats along with the private key file.
 
 2. Import the pfx file into the `TrustedPeople` directory of the `LocalMachine` certificate store on the windows endpoint.
 
diff --git a/WinrmAppveyor.psm1 b/WinrmAppveyor.psm1
deleted file mode 100644
index 58318f1b..00000000
--- a/WinrmAppveyor.psm1
+++ /dev/null
@@ -1,32 +0,0 @@
-function New-ClientCertificate {
-  param([String]$username, [String]$basePath = ((Resolve-Path .).Path))
-
-  $env:OPENSSL_CONF=[System.IO.Path]::GetTempFileName()
-
-  Set-Content -Path $env:OPENSSL_CONF -Value @"
-  distinguished_name = req_distinguished_name
-  [req_distinguished_name]
-  [v3_req_client]
-  extendedKeyUsage = clientAuth
-  subjectAltName = otherName:1.3.6.1.4.1.311.20.2.3;UTF8:$username@localhost
-"@
-
-  $user_path = Join-Path $basePath user.pem
-  $key_path = Join-Path $basePath key.pem
-  $pfx_path = Join-Path $basePath user.pfx
-
-  openssl req -x509 -nodes -days 3650 -newkey rsa:2048 -out $user_path -outform PEM -keyout $key_path -subj "/CN=$username" -extensions v3_req_client 2>&1
-
-  openssl pkcs12 -export -in $user_path -inkey $key_path -out $pfx_path -passout pass: 2>&1
-
-  del $env:OPENSSL_CONF
-}
-
-function New-WinrmUserCertificateMapping {
-  param([String]$issuer)
-  $secure_pass = ConvertTo-SecureString $env:winrm_password -AsPlainText -Force
-  $cred = New-Object System.Management.Automation.PSCredential ($env:winrm_user, $secure_pass)
-  New-Item -Path WSMan:\localhost\ClientCertificate -Subject "$env:winrm_user@localhost" -URI * -Issuer $issuer -Credential $cred -Force
-}
-
-Export-ModuleMember New-ClientCertificate, New-WinrmUserCertificateMapping
\ No newline at end of file
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index b9afb6d7..00000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,53 +0,0 @@
-version: "master-{build}"
-
-image: Visual Studio 2022
-platform:
-  - x64
-
-environment:
-  winrm_user: test_user
-  winrm_password: Pass@word1
-  user_cert: c:\projects\winrm\user.pem
-  user_key: c:\projects\winrm\key.pem
-
-  matrix:
-    - ruby_version: "33-x64"
-      winrm_endpoint: http://localhost:5985/wsman
-    - ruby_version: "32-x64"
-      winrm_endpoint: http://localhost:5985/wsman
-
-clone_folder: c:\projects\winrm
-clone_depth: 1
-branches:
-  only:
-    - master
-
-install:
-  - ps: net user /add $env:winrm_user $env:winrm_password
-  - ps: net localgroup administrators $env:winrm_user /add
-  - ps: $env:PATH="C:\OpenSSL-Win64\bin;$env:PATH"
-  - ps: Import-Module c:\projects\winrm\WinrmAppveyor.psm1
-  - ps: New-ClientCertificate $env:winrm_user c:\projects\winrm
-  - ps: $env:user_cert_thumb = (Import-pfxCertificate -FilePath c:\projects\winrm\user.pfx -CertStoreLocation Cert:\LocalMachine\root).Thumbprint
-  - ps: Import-pfxCertificate -FilePath c:\projects\winrm\user.pfx -CertStoreLocation Cert:\LocalMachine\TrustedPeople
-  - ps: $env:winrm_cert = (New-SelfSignedCertificate -DnsName localhost -CertStoreLocation cert:\localmachine\my).Thumbprint
-  - ps: Enable-PSRemoting -Force
-  - ps: winrm create winrm/config/Listener?Address=*+Transport=HTTPS "@{Hostname=`"localhost`";CertificateThumbprint=`"$($env:winrm_cert)`"}"
-  - ps: winrm set winrm/config/client/auth '@{Basic="true"}'
-  - ps: winrm set winrm/config/service/auth '@{Basic="true"}'
-  - ps: winrm set winrm/config/service/auth '@{Certificate="true"}'
-  - ps: winrm set winrm/config/service/auth '@{CbtHardeningLevel="Strict"}'
-  - ps: winrm set winrm/config/service '@{AllowUnencrypted="true"}'
-  - ps: New-WinrmUserCertificateMapping $env:user_cert_thumb
-  - ps: $env:PATH="C:\Ruby$env:ruby_version\bin;$env:PATH"
-  - ps: Write-Host $env:PATH
-  - ps: ruby --version
-  - ps: gem --version
-  - ps: bundler --version
-
-build_script:
-  - bundle install || bundle install || bundle install
-
-test_script:
-  - SET SPEC_OPTS=--format progress
-  - bundle exec rake integration