diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 622fecb..a787a98 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -73,7 +73,7 @@ jobs:
     strategy:
       matrix:
         swift:
-          - "6.0.2"
+          - "6.0.3"
     name: Android
     runs-on: ubuntu-latest
     steps:
diff --git a/Package.resolved b/Package.resolved
index d775f9c..e122b9e 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -1,5 +1,5 @@
 {
-  "originHash" : "4d23a799723a52d43100a64649bc07b777ae81b73a2353d64b05f800e4dc1ee6",
+  "originHash" : "d3cdc50533f27116a64a8e23ae44e0f4dafb7682d8a918168dd897ee27073c0f",
   "pins" : [
     {
       "identity" : "swift-custom-dump",
diff --git a/Sources/MacroTesting/AssertMacro.swift b/Sources/MacroTesting/AssertMacro.swift
index 5de675a..985f1f4 100644
--- a/Sources/MacroTesting/AssertMacro.swift
+++ b/Sources/MacroTesting/AssertMacro.swift
@@ -486,6 +486,8 @@ extension FixIt.Change {
           range: start..<end,
           replacement: replacingChildData.newChild.description
         )
+      @unknown default:
+        fatalError()
     #endif
     }
   }