diff --git a/Sources/MintCLI/Commands/PackageCommand.swift b/Sources/MintCLI/Commands/PackageCommand.swift
index 77b22e1..2248019 100644
--- a/Sources/MintCLI/Commands/PackageCommand.swift
+++ b/Sources/MintCLI/Commands/PackageCommand.swift
@@ -15,7 +15,7 @@ class PackageCommand: MintfileCommand {
         \(description)
         
         The package can be a shorthand for a github repo \"githubName/repo\", or a fully qualified .git path.
-        An optional version can be specified by appending @version to the repo, otherwise the newest tag will be used (or master if no tags are found.)
+        An optional version can be specified by appending @version to the repo, otherwise the newest tag will be used (or main, then master if no tags are found.)
         """
         if let parameterDescription = parameterDescription {
             longDescription += "\n\n\(parameterDescription)"
diff --git a/Sources/MintKit/Mint.swift b/Sources/MintKit/Mint.swift
index 64e2726..15d6dcc 100644
--- a/Sources/MintKit/Mint.swift
+++ b/Sources/MintKit/Mint.swift
@@ -84,6 +84,11 @@ public class Mint {
         return gitRepos
     }
 
+    func getDefaultGitBranch() throws -> String {
+        let refsOutput = try Task.capture(bash: "git ls-remote --heads --quiet | cut -f2 | cut -d'/' -f3")
+        return refsOutput.stdout
+    }
+
     func getLinkedExecutables() -> [Path] {
         guard linkPath.exists,
             let packages = try? linkPath.children() else {
@@ -164,14 +169,14 @@ public class Mint {
 
                 let tagReferences = tagOutput.stdout
                 if tagReferences.isEmpty {
-                    package.version = "master"
+                    package.version = try getDefaultGitBranch()
                 } else {
                     let tags = tagReferences.split(separator: "\n").map { String($0.split(separator: "\t").last!.split(separator: "/").last!) }
                     let versions = convertTagsToVersionMap(tags)
                     if let latestVersion = versions.keys.sorted().last, let tag = versions[latestVersion] {
                         package.version = tag
                     } else {
-                        package.version = "master"
+                        package.version = try getDefaultGitBranch()
                     }
                 }
             } catch {
diff --git a/Sources/MintKit/PackageReference.swift b/Sources/MintKit/PackageReference.swift
index b2503fe..511131d 100644
--- a/Sources/MintKit/PackageReference.swift
+++ b/Sources/MintKit/PackageReference.swift
@@ -63,7 +63,7 @@ public class PackageReference {
 
     public var versionCouldBeSHA: Bool {
         switch version {
-        case "master", "develop":
+        case "main", "master", "develop":
             return false
         default:
             let characterSet = CharacterSet.letters.union(.decimalDigits)
diff --git a/Tests/MintTests/PackageTests.swift b/Tests/MintTests/PackageTests.swift
index b31dbd3..330948f 100644
--- a/Tests/MintTests/PackageTests.swift
+++ b/Tests/MintTests/PackageTests.swift
@@ -92,6 +92,7 @@ class PackageTests: XCTestCase {
 
         XCTAssertFalse(PackageReference(repo: "", version: "my_branch").versionCouldBeSHA)
         XCTAssertFalse(PackageReference(repo: "", version: "develop").versionCouldBeSHA)
+        XCTAssertFalse(PackageReference(repo: "", version: "main").versionCouldBeSHA)
         XCTAssertFalse(PackageReference(repo: "", version: "master").versionCouldBeSHA)
         XCTAssertFalse(PackageReference(repo: "", version: "1.0").versionCouldBeSHA)
         XCTAssertFalse(PackageReference(repo: "", version: "fgvb45g_").versionCouldBeSHA)