diff --git a/Package.resolved b/Package.resolved
index 8649a6c..5c8c2bf 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -1,5 +1,5 @@
 {
-  "originHash" : "5d36627594955e7c1e9d5ca6b02c23ee9dc8e0d4ce73dc310b34fa6d1b966434",
+  "originHash" : "ef9c8ff40b986db3a591fe3c50d79e4fe2a9e11749d84a72fbe97babc9ba3683",
   "pins" : [
     {
       "identity" : "swift-argument-parser",
@@ -37,6 +37,15 @@
         "version" : "602.0.0"
       }
     },
+    {
+      "identity" : "swift-system",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-system",
+      "state" : {
+        "revision" : "7c6ad0fc39d0763e0b699210e4124afd5041c5df",
+        "version" : "1.6.4"
+      }
+    },
     {
       "identity" : "swift-tree-sitter",
       "kind" : "remoteSourceControl",
diff --git a/Package.swift b/Package.swift
index 8fc7ace..c319e07 100644
--- a/Package.swift
+++ b/Package.swift
@@ -36,6 +36,7 @@ let package = Package(
     .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0"),
     .package(url: "https://github.com/swiftlang/swift-syntax", from: "602.0.0"),
     .package(url: "https://github.com/apple/swift-argument-parser", from: "1.0.0"),
+    .package(url: "https://github.com/apple/swift-system", from: "1.6.1"),
   ],
   targets: [
     .macro(
@@ -67,7 +68,11 @@ let package = Package(
     ),
     .target(
       name: "Common",
-      dependencies: ["Macros"],
+      dependencies: [
+        "Macros",
+        .product(name: "SystemPackage", package: "swift-system"),
+
+      ],
       swiftSettings: [.enableExperimentalFeature("CodeItemMacros")],
     ),
     .target(
@@ -90,6 +95,7 @@ let package = Package(
       name: "Tests",
       dependencies: [
         "P4Compiler", "P4Runtime", "P4Lang", "Macros", "TreeSitterExtensions", "Common",
+        .product(name: "SystemPackage", package: "swift-system"),
       ],
       swiftSettings: [.enableExperimentalFeature("CodeItemMacros")],
     ),
diff --git a/Sources/Common/SourceCode.swift b/Sources/Common/SourceCode.swift
index f839be4..7411228 100644
--- a/Sources/Common/SourceCode.swift
+++ b/Sources/Common/SourceCode.swift
@@ -16,7 +16,7 @@
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 import Foundation
-import System
+import SystemPackage
 
 /// Represent a location in a post-preprocessed piece of P4 source code.
 public struct SourceLocation: Equatable, CustomStringConvertible {
@@ -145,9 +145,7 @@ func do_preprocess(
         }
 
         // Try to make a url from the configured file.
-        guard let included_url = URL.init(filePath: included_path) else {
-          return .Error(Error(withMessage: "Could not convert \(included_path) into a URL"))
-        }
+        let included_url = URL.init(filePath: included_path.string)
 
         // By calling ourselves recursively, the include being processed will
         // be _completely_ expanded (including any nested includes).
@@ -203,9 +201,7 @@ public struct SourceCodePreprocessor {
       return .Error(Error(withMessage: "Could not open \(file) for preprocessing"))
     }
 
-    guard let url = URL.init(filePath: file_to_open) else {
-      return .Error(Error(withMessage: "Could not convert \(file_to_open) into a URL"))
-    }
+    let url = URL.init(filePath: file_to_open.string)
 
     switch do_preprocess(url, self.manager) {
     case .Ok((let location, let contents)):
diff --git a/Tests/p4rseTests/SupportTests/SourceCode.swift b/Tests/p4rseTests/SupportTests/SourceCode.swift
index b32ba72..8189f23 100644
--- a/Tests/p4rseTests/SupportTests/SourceCode.swift
+++ b/Tests/p4rseTests/SupportTests/SourceCode.swift
@@ -21,7 +21,7 @@ import P4Compiler
 import P4Lang
 import P4Runtime
 import SwiftTreeSitter
-import System
+import SystemPackage
 import Testing
 import TreeSitter
 import TreeSitterP4