diff --git a/.github/workflows/mirror-ios.yml b/.github/workflows/mirror-ios.yml
index 08e6d2e0f..22e67397a 100644
--- a/.github/workflows/mirror-ios.yml
+++ b/.github/workflows/mirror-ios.yml
@@ -33,7 +33,8 @@ jobs:
   # setup-macos. It also must not save the setup-macos caches, or it would take the cache keys
   # of the Mac app job.
   mirror-ios:
-    runs-on: macos-26
+    # Use the same Xcode as the Mac app job (see test.yml).
+    runs-on: xcode-27
     timeout-minutes: 20
     permissions:
       contents: read
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ef76e1e5d..05776e281 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -22,7 +22,10 @@ concurrency:
 
 jobs:
   build:
-    runs-on: macos-26
+    # The Swift 6.4 toolchain selects different package manifests than Swift 6.3 and earlier,
+    # so .package.resolved changes with the Xcode major version. Use the same Xcode as local
+    # builds and releases. GitHub marks this image as a preview until a macos-27 label exists.
+    runs-on: xcode-27
     # A green run takes 6 to 10 minutes, and a slow runner has taken 2.5 times as long. The test
     # watchdog stops a hung test run sooner; this limit stops anything else that hangs. Without
     # it the default is 6 hours, so a stuck run had to be cancelled by hand.
diff --git a/.package.resolved b/.package.resolved
index 4176f44d7..8edf3462b 100644
--- a/.package.resolved
+++ b/.package.resolved
@@ -1,5 +1,5 @@
 {
-  "originHash" : "caf2c77d23cf93f77c2108f23143413113571355b719b2708d3543c5f0d28a45",
+  "originHash" : "b72456afb5adf1ad80b06d38f53b03f88aa071251543d9a5080d09da0ca4a94c",
   "pins" : [
     {
       "identity" : "combine-schedulers",
@@ -118,6 +118,15 @@
         "version" : "1.1.1"
       }
     },
+    {
+      "identity" : "swift-issue-reporting",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/swift-issue-reporting",
+      "state" : {
+        "revision" : "71c7c9a761d1ca6ed4ccb6ced040fe1c1a39e8e7",
+        "version" : "2.1.0"
+      }
+    },
     {
       "identity" : "swift-json-schema",
       "kind" : "remoteSourceControl",
@@ -163,15 +172,6 @@
         "version" : "602.0.0"
       }
     },
-    {
-      "identity" : "xctest-dynamic-overlay",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/pointfreeco/xctest-dynamic-overlay",
-      "state" : {
-        "revision" : "d9308ad679143c26a30dec52daefe82f54af2b82",
-        "version" : "1.13.1"
-      }
-    },
     {
       "identity" : "yams",
       "kind" : "remoteSourceControl",