diff --git a/CHANGELOG.md b/CHANGELOG.md
index f4c5a51d..14326fdc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,10 @@
 
 ## Master
 
+## 3.21.2
+
+- Fix Runner's path resolution to enable `--cwd` with relative paths [@Fab1n](https://github.com/Fab1n) - [#650](https://github.com/danger/swift/pull/650)
+
 ## 3.21.1
 
 - Fix current directory url creation [@f-meloni][] - [#640](https://github.com/danger/swift/pull/640)
diff --git a/Sources/Runner/Commands/Runner.swift b/Sources/Runner/Commands/Runner.swift
index ae7ec5ee..9a5402de 100644
--- a/Sources/Runner/Commands/Runner.swift
+++ b/Sources/Runner/Commands/Runner.swift
@@ -162,7 +162,7 @@ func runDanger(version dangerSwiftVersion: String, logger: Logger) throws {
        (cwdOptionIndex + 1) < CommandLine.arguments.count
     {
         let directoryURL = URL(fileURLWithPath: CommandLine.arguments[cwdOptionIndex + 1])
-        proc.currentDirectoryURL = directoryURL
+        proc.currentDirectoryURL = directoryURL.absoluteURL
     }
     proc.standardOutput = standardOutput
     proc.standardError = standardOutput