diff --git a/Package.swift b/Package.swift
index c3fc8820..4e01726c 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version: 5.6
+// swift-tools-version: 5.7
 
 import PackageDescription
 
diff --git a/Sources/Clocks/AnyClock.swift b/Sources/Clocks/AnyClock.swift
index ace96939..f9f8cfd6 100644
--- a/Sources/Clocks/AnyClock.swift
+++ b/Sources/Clocks/AnyClock.swift
@@ -1,4 +1,4 @@
-#if swift(>=5.7) && (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst))
+#if (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst))
   /// A type-erased clock.
   ///
   /// This type provides a concrete alternative to `any Clock<Duration>` and makes it possible to
diff --git a/Sources/Clocks/ImmediateClock.swift b/Sources/Clocks/ImmediateClock.swift
index 6ecee1e5..ab76a0bb 100644
--- a/Sources/Clocks/ImmediateClock.swift
+++ b/Sources/Clocks/ImmediateClock.swift
@@ -1,4 +1,4 @@
-#if swift(>=5.7) && (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst))
+#if (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst))
   import ConcurrencyExtras
   import Foundation
 
diff --git a/Sources/Clocks/Internal/_AsyncTimerSequence.swift b/Sources/Clocks/Internal/_AsyncTimerSequence.swift
index a5315eac..a4ce9909 100644
--- a/Sources/Clocks/Internal/_AsyncTimerSequence.swift
+++ b/Sources/Clocks/Internal/_AsyncTimerSequence.swift
@@ -1,4 +1,4 @@
-#if swift(>=5.7) && (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst))
+#if (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst))
   //===----------------------------------------------------------------------===//
   //
   // This source file is part of the Swift Async Algorithms open source project
diff --git a/Sources/Clocks/Shims.swift b/Sources/Clocks/Shims.swift
deleted file mode 100644
index 5737704d..00000000
--- a/Sources/Clocks/Shims.swift
+++ /dev/null
@@ -1,17 +0,0 @@
-#if swift(>=5.7) && (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst)) && swift(<5.9)
-  @available(iOS 16, macOS 13, tvOS 16, watchOS 9, *)
-  extension Clock {
-    /// Suspends for the given duration.
-    ///
-    /// This method should be provided by the standard library, but it is not yet included. See this
-    /// proposal for more information:
-    /// <https://github.com/apple/swift-evolution/blob/main/proposals/0374-clock-sleep-for.md>
-    @_disfavoredOverload
-    public func sleep(
-      for duration: Duration,
-      tolerance: Duration? = nil
-    ) async throws {
-      try await self.sleep(until: self.now.advanced(by: duration), tolerance: tolerance)
-    }
-  }
-#endif
diff --git a/Sources/Clocks/SwiftUI.swift b/Sources/Clocks/SwiftUI.swift
index d6b1a243..6c299dac 100644
--- a/Sources/Clocks/SwiftUI.swift
+++ b/Sources/Clocks/SwiftUI.swift
@@ -1,4 +1,4 @@
-#if swift(>=5.7) && (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst)) && canImport(SwiftUI)
+#if (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst)) && canImport(SwiftUI)
   import SwiftUI
 
   @available(macOS 13, iOS 16, watchOS 9, tvOS 16, *)
diff --git a/Sources/Clocks/TestClock.swift b/Sources/Clocks/TestClock.swift
index 3b586c94..0cda3855 100644
--- a/Sources/Clocks/TestClock.swift
+++ b/Sources/Clocks/TestClock.swift
@@ -1,4 +1,4 @@
-#if swift(>=5.7) && (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst))
+#if (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst))
   import ConcurrencyExtras
   import Foundation
   import XCTestDynamicOverlay
diff --git a/Sources/Clocks/Timer.swift b/Sources/Clocks/Timer.swift
index 5e1cfe46..24e36291 100644
--- a/Sources/Clocks/Timer.swift
+++ b/Sources/Clocks/Timer.swift
@@ -1,4 +1,4 @@
-#if swift(>=5.7) && (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst))
+#if (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst))
   @available(iOS 16, macOS 13, tvOS 16, watchOS 9, *)
   extension Clock where Duration: Hashable {
     /// Creates an async sequence that emits the clock's `now` value on an interval.
diff --git a/Sources/Clocks/UnimplementedClock.swift b/Sources/Clocks/UnimplementedClock.swift
index 5b5a210a..2dd06da9 100644
--- a/Sources/Clocks/UnimplementedClock.swift
+++ b/Sources/Clocks/UnimplementedClock.swift
@@ -1,4 +1,4 @@
-#if swift(>=5.7) && (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst))
+#if (canImport(RegexBuilder) || !os(macOS) && !targetEnvironment(macCatalyst))
   import ConcurrencyExtras
   import Foundation
   import XCTestDynamicOverlay
diff --git a/Tests/ClocksTests/ShimTests.swift b/Tests/ClocksTests/ShimTests.swift
deleted file mode 100644
index 52f9ae5c..00000000
--- a/Tests/ClocksTests/ShimTests.swift
+++ /dev/null
@@ -1,23 +0,0 @@
-import Clocks
-import XCTest
-
-@available(iOS 16, macOS 13, tvOS 16, watchOS 9, *)
-final class ShimTests: XCTestCase {
-  func testClockSleepFor() async {
-    let testClock = TestClock()
-    let clock: some Clock<Duration> = testClock
-
-    let isFinished = ActorIsolated(false)
-    Task {
-      try await clock.sleep(for: .seconds(1))
-      await isFinished.setValue(true)
-    }
-
-    var checkIsFinished = await isFinished.value
-    XCTAssertEqual(checkIsFinished, false)
-
-    await testClock.advance(by: .seconds(1))
-    checkIsFinished = await isFinished.value
-    XCTAssertEqual(checkIsFinished, true)
-  }
-}