diff --git a/Package.swift b/Package.swift
index 4f0fc49..66effa5 100644
--- a/Package.swift
+++ b/Package.swift
@@ -90,3 +90,9 @@ if ProcessInfo.processInfo.environment["SWIFTCI_USE_LOCAL_DEPS"] == nil {
         .package(path: "../swift-asn1"),
     ]
 }
+
+for target in package.targets {
+    var settings = target.swiftSettings ?? []
+    settings.append(.enableUpcomingFeature("MemberImportVisibility"))
+    target.swiftSettings = settings
+}