diff --git a/Dockerfile b/Dockerfile
index 89eab906..84e50039 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -104,6 +104,7 @@ RUN curl -Ls "$(curl -Ls https://api.github.com/repos/terraform-linters/tflint/r
 ENV GITHUB_SHA=${GITHUB_SHA} \
     GITHUB_EVENT_PATH=${GITHUB_EVENT_PATH} \
     GITHUB_WORKSPACE=${GITHUB_WORKSPACE} \
+    DEFAULT_BRANCH=${DEFAULT_BRANCH} \
     VALIDATE_ALL_CODEBASE=${VALIDATE_ALL_CODEBASE} \
     VALIDATE_YAML=${VALIDATE_YAML} \
     VALIDATE_JSON=${VALIDATE_JSON} \
diff --git a/README.md b/README.md
index f60cdaad..1981b2fa 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@ This repository is for the **GitHub Action** to run a **Super-Linter**.
 It is a simple combination of various linters, written in `bash`, to help validate your source code.
 
 The end goal of this tool:
-- Prevent broken code from being uploaded to *master* branches
+- Prevent broken code from being uploaded to the default branch (Usually `master`) branches
 - Help establish coding best practices across multiple languages
 - Build guidelines for code layout and format
 - Automate the process to help streamline code reviews
@@ -113,6 +113,7 @@ and won't run anything unexpected.
 | **ENV VAR** | **Default Value** | **Notes** |
 | --- | --- | --- |
 | **VALIDATE_ALL_CODEBASE** | `true` | Will parse the entire repository and find all files to validate across all types. **NOTE:** When set to `false`, only **new** or **edited** files will be parsed for validation. |
+| **DEFAULT_BRANCH** | `master` | The name of the repository default branch. |
 | **VALIDATE_YAML** | `true` |Flag to enable or disable the linting process of the language. |
 | **VALIDATE_JSON** | `true` | Flag to enable or disable the linting process of the language. |
 | **VALIDATE_XML** | `true` | Flag to enable or disable the linting process of the language. |
diff --git a/lib/linter.sh b/lib/linter.sh
index 4ea4461b..624bb9b7 100755
--- a/lib/linter.sh
+++ b/lib/linter.sh
@@ -69,6 +69,7 @@ LANGUAGE_ARRAY=('YML' 'JSON' 'XML' 'MARKDOWN' 'BASH' 'PERL' 'RUBY' 'PYTHON'
 GITHUB_SHA="${GITHUB_SHA}"                            # GitHub sha from the commit
 GITHUB_EVENT_PATH="${GITHUB_EVENT_PATH}"              # Github Event Path
 GITHUB_WORKSPACE="${GITHUB_WORKSPACE}"                # Github Workspace
+DEFAULT_BRANCH="${DEFAULT_BRANCH:-master}"            # Default Git Branch to use (master by default)
 ANSIBLE_DIRECTORY="${ANSIBLE_DIRECTORY}"              # Ansible Directory
 VALIDATE_ALL_CODEBASE="${VALIDATE_ALL_CODEBASE}"      # Boolean to validate all files
 VALIDATE_YAML="${VALIDATE_YAML}"                      # Boolean to validate language
@@ -1154,10 +1155,10 @@ BuildFileList()
     echo "Pulling in code history and branches..."
   fi
 
-  #####################################################################
-  # Switch codebase back to master to get a list of all files changed #
-  #####################################################################
-  SWITCH_CMD=$(cd "$GITHUB_WORKSPACE" || exit; git pull --quiet; git checkout master 2>&1)
+  #################################################################################
+  # Switch codebase back to the default branch to get a list of all files changed #
+  #################################################################################
+  SWITCH_CMD=$(cd "$GITHUB_WORKSPACE" || exit; git pull --quiet; git checkout "$DEFAULT_BRANCH" 2>&1)
 
   #######################
   # Load the error code #
@@ -1169,7 +1170,7 @@ BuildFileList()
   ##############################
   if [ $ERROR_CODE -ne 0 ]; then
     # Error
-    echo "Failed to switch to master branch to get files changed!"
+    echo "Failed to switch to $DEFAULT_BRANCH branch to get files changed!"
     echo "ERROR:[$SWITCH_CMD]"
     exit 1
   fi
@@ -1180,14 +1181,14 @@ BuildFileList()
   if [[ "$ACTIONS_RUNNER_DEBUG" == "true" ]]; then
     echo ""
     echo "----------------------------------------------"
-    echo "Generating Diff with:[git diff --name-only 'master..$GITHUB_SHA' --diff-filter=d]"
+    echo "Generating Diff with:[git diff --name-only '$DEFAULT_BRANCH..$GITHUB_SHA' --diff-filter=d]"
   fi
 
   ################################################
   # Get the Array of files changed in the comits #
   ################################################
   # shellcheck disable=SC2207
-  RAW_FILE_ARRAY=($(cd "$GITHUB_WORKSPACE" || exit; git diff --name-only "master..$GITHUB_SHA" --diff-filter=d 2>&1))
+  RAW_FILE_ARRAY=($(cd "$GITHUB_WORKSPACE" || exit; git diff --name-only "$DEFAULT_BRANCH..$GITHUB_SHA" --diff-filter=d 2>&1))
 
   #######################
   # Load the error code #
@@ -1910,7 +1911,7 @@ RunTestCases()
 {
   # This loop will run the test cases and exclude user code
   # This is called from the automation process to validate new code
-  # When a PR is opened, the new code is validated with the master branch
+  # When a PR is opened, the new code is validated with the default branch
   # version of linter.sh, and a new container is built with the latest codebase
   # for testing. That container is spun up, and ran,
   # with the flag: TEST_CASE_RUN=true