diff --git a/.github/workflows/common_tests.yml b/.github/workflows/common_tests.yml
index 5a6bb68..96e0257 100644
--- a/.github/workflows/common_tests.yml
+++ b/.github/workflows/common_tests.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@master
+      uses: actions/checkout@v2
 
     - name: Install Pester
       shell: pwsh
diff --git a/azure-pipelines/get-tool-versions.yml b/azure-pipelines/get-tool-versions.yml
index 629c224..8c38d6c 100644
--- a/azure-pipelines/get-tool-versions.yml
+++ b/azure-pipelines/get-tool-versions.yml
@@ -6,13 +6,13 @@ schedules:
   displayName: First daily build
   branches:
     include:
-    - master
+    - main
   always: true
 - cron: "0 15 * * *"
   displayName: Second daily build
   branches:
     include:
-    - master
+    - main
   always: true
 
 variables:
diff --git a/github/github-api.psm1 b/github/github-api.psm1
index 2634423..4cb0929 100644
--- a/github/github-api.psm1
+++ b/github/github-api.psm1
@@ -36,7 +36,7 @@ class GitHubApi
             title = $Title
             body = $Body
             head = $BranchName
-            base = "master"
+            base = "main"
         } | ConvertTo-Json
 
         $url = "pulls"
@@ -45,7 +45,7 @@ class GitHubApi
 
     [object] GetPullRequest([string]$BranchName, [string]$RepositoryOwner){
         $url = "pulls"
-        return $this.InvokeRestMethod($url, 'GET', "head=${RepositoryOwner}:$BranchName&base=master", $null)
+        return $this.InvokeRestMethod($url, 'GET', "head=${RepositoryOwner}:$BranchName&base=main", $null)
     }
 
     [object] UpdatePullRequest([string]$Title, [string]$Body, [string]$BranchName, [string]$PullRequestNumber){
@@ -53,7 +53,7 @@ class GitHubApi
             title = $Title
             body = $Body
             head = $BranchName
-            base = "master"
+            base = "main"
         } | ConvertTo-Json
 
         $url = "pulls/$PullRequestNumber"