diff --git a/Package.swift b/Package.swift
index 1fe714fe..03e5a939 100644
--- a/Package.swift
+++ b/Package.swift
@@ -21,7 +21,8 @@ let package = Package(
     dependencies: [
         .package(url: "https://github.com/pointfreeco/swift-snapshot-testing", from: "1.10.0"),
         .package(url: "https://github.com/pointfreeco/swift-custom-dump", from: "1.3.2"),
-        .package(url: "https://github.com/pointfreeco/combine-schedulers", from: "1.0.2")
+        .package(url: "https://github.com/pointfreeco/combine-schedulers", from: "1.0.2"),
+        .package(url: "https://github.com/pointfreeco/xctest-dynamic-overlay", from: "1.3.0")
     ],
     targets: [
         .target(
@@ -54,7 +55,8 @@ let package = Package(
                 "KlaviyoCore",
                 "ComposableArchitecture",
                 "KIssueReporting",
-                "KCasePaths"
+                "KCasePaths",
+                .product(name: "XCTestDynamicOverlay", package: "xctest-dynamic-overlay")
             ],
             exclude: [
                 "__Snapshots__"
diff --git a/Package@swift-6.0.swift b/Package@swift-6.0.swift
index 6a8d925e..56890279 100644
--- a/Package@swift-6.0.swift
+++ b/Package@swift-6.0.swift
@@ -20,7 +20,8 @@ let package = Package(
     dependencies: [
         .package(url: "https://github.com/pointfreeco/swift-snapshot-testing", from: "1.10.0"),
         .package(url: "https://github.com/pointfreeco/swift-custom-dump", from: "1.3.2"),
-        .package(url: "https://github.com/pointfreeco/combine-schedulers", from: "1.0.2")
+        .package(url: "https://github.com/pointfreeco/combine-schedulers", from: "1.0.2"),
+        .package(url: "https://github.com/pointfreeco/xctest-dynamic-overlay", from: "1.3.0")
     ],
     targets: [
         .target(
@@ -52,7 +53,9 @@ let package = Package(
                 .product(name: "CombineSchedulers", package: "combine-schedulers"),
                 "KlaviyoCore",
                 "ComposableArchitecture",
-                "KIssueReporting"
+                "KIssueReporting",
+                "KCasePaths",
+                .product(name: "XCTestDynamicOverlay", package: "xctest-dynamic-overlay")
             ],
             exclude: [
                 "__Snapshots__"
diff --git a/Sources/CasePaths/Internal/Deprecations.swift b/Sources/CasePaths/Internal/Deprecations.swift
deleted file mode 100644
index 6443229b..00000000
--- a/Sources/CasePaths/Internal/Deprecations.swift
+++ /dev/null
@@ -1,443 +0,0 @@
-@_spi(CurrentTestCase) import XCTestDynamicOverlay
-
-#if canImport(ObjectiveC)
-  import ObjectiveC
-#endif
-
-// Deprecated after 1.4.2:
-
-extension AnyCasePath where Root == Value {
-  @available(*, deprecated, message: "Use the '\\.self' case key path, instead")
-  public static var `self`: Self {
-    .init(
-      embed: { $0 },
-      extract: { .some($0) }
-    )
-  }
-}
-
-extension AnyCasePath where Root: _OptionalProtocol, Value == Root.Wrapped {
-  @available(*, deprecated, message: "Use the '\\Optional.Cases.some' case key path, instead")
-  public static var some: Self {
-    .init(embed: { Root($0) }, extract: { $0.optional })
-  }
-}
-
-public protocol _OptionalProtocol {
-  associatedtype Wrapped
-  var optional: Wrapped? { get }
-  init(_ some: Wrapped)
-}
-
-extension Optional: _OptionalProtocol {
-  public var optional: Wrapped? { self }
-}
-
-extension AnyCasePath {
-  @available(*, deprecated, message: "Use a 'CasePathable' case key path, instead")
-  public init(_ embed: @escaping (Value) -> Root) {
-    @UncheckedSendable var embed = embed
-    self.init(unsafe: { [$embed] in $embed.wrappedValue($0) })
-  }
-}
-
-extension AnyCasePath where Value == Void {
-  @available(*, deprecated, message: "Use a 'CasePathable' case key path, instead")
-  @_disfavoredOverload
-  public init(_ root: @autoclosure @escaping @Sendable () -> Root) {
-    self.init(unsafe: root())
-  }
-}
-
-extension AnyCasePath where Root == Value {
-  @available(*, deprecated, message: "Use the '\\.self' case key path, instead")
-  public init(_ type: Root.Type) {
-    self = .self
-  }
-}
-
-prefix operator /
-
-extension AnyCasePath {
-  @_documentation(visibility: internal)
-  @available(*, deprecated, message: "Use 'CasePathable.is' with a case key path, instead")
-  public static func ~= (pattern: AnyCasePath, value: Root) -> Bool {
-    pattern.extract(from: value) != nil
-  }
-}
-
-@_documentation(visibility: internal)
-@available(*, deprecated, message: "Use a 'CasePathable' case key path, instead")
-public prefix func / <Root, Value>(
-  embed: @escaping (Value) -> Root
-) -> AnyCasePath<Root, Value> {
-  @UncheckedSendable var embed = embed
-  return AnyCasePath(
-    embed: { [$embed] in $embed.wrappedValue($0) },
-    extract: { [$embed] in extractHelp { $embed.wrappedValue($0) }($0) }
-  )
-}
-
-@_documentation(visibility: internal)
-@available(*, deprecated, message: "Use a 'CasePathable' case key path, instead")
-public prefix func / <Root, Value>(
-  embed: @escaping (Value) -> Root?
-) -> AnyCasePath<Root?, Value> {
-  @UncheckedSendable var embed = embed
-  return AnyCasePath(
-    embed: { [$embed] in $embed.wrappedValue($0) },
-    extract: optionalPromotedExtractHelp { [$embed] in $embed.wrappedValue($0) }
-  )
-}
-
-@_documentation(visibility: internal)
-@available(*, deprecated, message: "Use a 'CasePathable' case key path, instead")
-public prefix func / <Root>(
-  root: @autoclosure @escaping @Sendable () -> Root
-) -> AnyCasePath<Root, Void> {
-  .init(embed: root, extract: extractVoidHelp(root()))
-}
-
-@_documentation(visibility: internal)
-@available(*, deprecated, message: "Use a 'CasePathable' case key path, instead")
-public prefix func / <Root>(
-  root: @autoclosure @escaping @Sendable () -> Root?
-) -> AnyCasePath<Root?, Void> {
-  .init(embed: root, extract: optionalPromotedExtractVoidHelp(root()))
-}
-
-@_documentation(visibility: internal)
-@available(*, deprecated, message: "Use the '\\.self' case key path, instead")
-public prefix func / <Root>(
-  type: Root.Type
-) -> AnyCasePath<Root, Root> {
-  .self
-}
-
-@_documentation(visibility: internal)
-@available(*, deprecated, message: "Use a case key path (like '\\.self' or '\\.some'), instead")
-public prefix func / <Root, Value>(
-  path: AnyCasePath<Root, Value>
-) -> AnyCasePath<Root, Value> {
-  path
-}
-
-@_disfavoredOverload
-@_documentation(visibility: internal)
-@available(
-  *, deprecated, message: "Use a 'CasePathable' case property via dynamic member lookup, instead"
-)
-public prefix func / <Root, Value>(
-  embed: @escaping (Value) -> Root
-) -> (Root) -> Value? {
-  (/embed).extract(from:)
-}
-
-@_disfavoredOverload
-@_documentation(visibility: internal)
-@available(
-  *, deprecated, message: "Use a 'CasePathable' case property via dynamic member lookup, instead"
-)
-public prefix func / <Root, Value>(
-  embed: @escaping (Value) -> Root?
-) -> (Root?) -> Value? {
-  (/embed).extract(from:)
-}
-
-@_disfavoredOverload
-@_documentation(visibility: internal)
-@available(
-  *, deprecated, message: "Use a 'CasePathable' case property via dynamic member lookup, instead"
-)
-public prefix func / <Root>(
-  root: @autoclosure @escaping @Sendable () -> Root
-) -> (Root) -> Void? {
-  (/root).extract(from:)
-}
-
-@_disfavoredOverload
-@_documentation(visibility: internal)
-@available(
-  *, deprecated, message: "Use a 'CasePathable' case property via dynamic member lookup, instead"
-)
-public prefix func / <Root>(
-  root: @autoclosure @escaping @Sendable () -> Root
-) -> (Root?) -> Void? {
-  (/root).extract(from:)
-}
-
-precedencegroup CasePathCompositionPrecedence {
-  associativity: left
-}
-
-infix operator .. : CasePathCompositionPrecedence
-
-extension AnyCasePath {
-  @_documentation(visibility: internal)
-  @available(*, deprecated, message: "Append 'CasePathable' case key paths, instead")
-  public static func .. <AppendedValue>(
-    lhs: AnyCasePath,
-    rhs: AnyCasePath<Value, AppendedValue>
-  ) -> AnyCasePath<Root, AppendedValue> {
-    lhs.appending(path: rhs)
-  }
-
-  @_documentation(visibility: internal)
-  @available(*, deprecated, message: "Append 'CasePathable' case key paths, instead")
-  public static func .. <AppendedValue>(
-    lhs: AnyCasePath,
-    rhs: @escaping (AppendedValue) -> Value
-  ) -> AnyCasePath<Root, AppendedValue> {
-    lhs.appending(path: /rhs)
-  }
-}
-
-@_documentation(visibility: internal)
-@available(*, deprecated, message: "Chain 'CasePathable' case properties, instead")
-public func .. <Root, Value, AppendedValue>(
-  lhs: @escaping (Root) -> Value?,
-  rhs: @escaping (AppendedValue) -> Value
-) -> (Root) -> AppendedValue? {
-  return { root in lhs(root).flatMap((/rhs).extract(from:)) }
-}
-
-@available(
-  *, deprecated, message: "Use XCTest's 'XCTUnwrap' with a 'CasePathable' case property, instead"
-)
-public func XCTUnwrap<Enum, Case>(
-  _ enum: @autoclosure () throws -> Enum,
-  case extract: (Enum) -> Case?,
-  _ message: @autoclosure () -> String = "",
-  file: StaticString = #filePath,
-  line: UInt = #line
-) throws -> Case {
-  let `enum` = try `enum`()
-  guard let value = extract(`enum`)
-  else {
-    #if canImport(ObjectiveC)
-      _ = XCTCurrentTestCase?.perform(Selector(("setContinueAfterFailure:")), with: false)
-    #endif
-    let message = message()
-    XCTFail(
-      """
-      XCTUnwrap: Expected to extract value of type "\(typeName(Case.self))" from \
-      "\(typeName(Enum.self))"\
-      \(message.isEmpty ? "" : " - " + message) …
-
-        Actual:
-          \(String(describing: `enum`))
-      """,
-      file: file,
-      line: line
-    )
-    throw UnwrappingCase()
-  }
-  return value
-}
-
-@available(*, deprecated, message: "Use a 'CasePathable' case key path, instead")
-public func XCTModify<Enum, Case>(
-  _ enum: inout Enum,
-  case casePath: AnyCasePath<Enum, Case>,
-  _ message: @autoclosure () -> String = "",
-  _ body: (inout Case) throws -> Void,
-  file: StaticString = #filePath,
-  line: UInt = #line
-) {
-  _XCTModify(&`enum`, case: casePath, message(), body, file: file, line: line)
-}
-
-// Deprecated after 1.0.0:
-
-/// A type-erased case path that supports embedding a value in a root and attempting to extract a
-/// root's embedded value.
-///
-/// This type has been renamed to ``AnyCasePath`` and is primarily employed by the
-/// ``CasePathable()`` macro to derive ``CaseKeyPath``s from an enum's cases.
-@available(*, deprecated, renamed: "AnyCasePath")
-public typealias CasePath = AnyCasePath
-
-@available(*, deprecated, message: "Use 'CustomDebugStringConvertible.debugDescription', instead")
-extension AnyCasePath: CustomStringConvertible {
-  public var description: String {
-    "AnyCasePath<\(typeName(Root.self)), \(typeName(Value.self))>"
-  }
-}
-
-extension AnyCasePath where Root == Void {
-  /// Returns a case path that always successfully extracts the given constant value.
-  ///
-  /// - Parameter value: A constant value.
-  /// - Returns: A case path from `()` to `value`.
-  @available(*, deprecated)
-  public static func constant(_ value: @autoclosure @escaping @Sendable () -> Value) -> Self {
-    .init(
-      embed: { _ in () },
-      extract: { .some(value()) }
-    )
-  }
-}
-
-extension AnyCasePath where Value == Never {
-  /// The never case path for `Root`: a case path that always fails to extract the a value of the
-  /// uninhabited `Never` type.
-  @available(*, deprecated)
-  public static var never: Self {
-    @Sendable func absurd<A>(_ never: Never) -> A {}
-    return .init(
-      embed: absurd,
-      extract: { _ in nil }
-    )
-  }
-}
-
-extension AnyCasePath where Value: RawRepresentable, Root == Value.RawValue {
-  /// Returns a case path for `RawRepresentable` types: a case path that attempts to extract a value
-  /// that can be represented by a raw value from a raw value.
-  @available(*, deprecated)
-  public static var rawValue: Self {
-    .init(
-      embed: { $0.rawValue },
-      extract: { Value(rawValue: $0) }
-    )
-  }
-}
-
-extension AnyCasePath where Value: LosslessStringConvertible, Root == String {
-  /// Returns a case path for `LosslessStringConvertible` types: a case path that attempts to
-  /// extract a value that can be represented by a lossless string from a string.
-  @available(*, deprecated)
-  public static var description: Self {
-    .init(
-      embed: { $0.description },
-      extract: { Value($0) }
-    )
-  }
-}
-
-// Deprecated after 0.5.0:
-
-extension AnyCasePath {
-  /// Returns a case path that extracts values associated with a given enum case initializer.
-  ///
-  /// - Note: This function is only intended to be used with enum case initializers. Its behavior is
-  ///   otherwise undefined.
-  /// - Parameter embed: An enum case initializer.
-  /// - Returns: A case path that extracts associated values from enum cases.
-  @available(*, deprecated, message: "Use a 'CasePathable' case key path, instead")
-  public static func `case`(_ embed: @escaping @Sendable (Value) -> Root) -> Self {
-    self.init(
-      embed: embed,
-      extract: { KCasePaths.extract(embed)($0) }
-    )
-  }
-}
-
-extension AnyCasePath where Value == Void {
-  /// Returns a case path that successfully extracts `()` from a given enum case with no associated
-  /// values.
-  ///
-  /// - Note: This function is only intended to be used with enum cases that have no associated
-  ///   values. Its behavior is otherwise undefined.
-  /// - Parameter value: An enum case with no associated values.
-  /// - Returns: A case path that extracts `()` if the case matches, otherwise `nil`.
-  @available(*, deprecated, message: "Use a 'CasePathable' case key path, instead")
-  public static func `case`(_ value: @autoclosure @escaping @Sendable () -> Root) -> Self {
-    Self(
-      embed: value,
-      extract: extractVoidHelp(value())
-    )
-  }
-}
-
-/// Attempts to extract values associated with a given enum case initializer from a given root enum.
-///
-/// ```swift
-/// extract(case: Result<Int, Error>.success, from: .success(42))
-/// // 42
-/// extract(case: Result<Int, Error>.success, from: .failure(MyError())
-/// // nil
-/// ```
-///
-/// - Note: This function is only intended to be used with enum case initializers. Its behavior is
-///   otherwise undefined.
-/// - Parameters:
-///   - embed: An enum case initializer.
-///   - root: A root enum value.
-/// - Returns: Values if they can be extracted from the given enum case initializer and root enum,
-///   otherwise `nil`.
-@available(*, deprecated, message: "Use a '@CasePathable' case property, instead")
-public func extract<Root, Value>(
-  case embed: @escaping @Sendable (Value) -> Root,
-  from root: Root
-) -> Value? {
-  KCasePaths.extract(embed)(root)
-}
-
-/// Attempts to extract values associated with a given enum case initializer from a given root enum.
-///
-/// ```swift
-/// extract(case: Result<Int, Error>.success, from: .success(42))
-/// // 42
-/// extract(case: Result<Int, Error>.success, from: .failure(MyError())
-/// // nil
-/// ```
-///
-/// - Note: This function is only intended to be used with enum case initializers. Its behavior is
-///   otherwise undefined.
-/// - Parameters:
-///   - embed: An enum case initializer.
-///   - root: A root enum value.
-/// - Returns: Values if they can be extracted from the given enum case initializer and root enum,
-///   otherwise `nil`.
-@available(*, deprecated, message: "Use a '@CasePathable' case property, instead")
-public func extract<Root, Value>(
-  case embed: @escaping @Sendable (Value) -> Root?,
-  from root: Root?
-) -> Value? {
-  KCasePaths.extract(embed)(root)
-}
-
-/// Returns a function that can attempt to extract associated values from the given enum case
-/// initializer.
-///
-/// Use this function to create new transform functions to pass to higher-order methods like
-/// `compactMap`:
-///
-/// ```swift
-/// [Result<Int, Error>.success(42), .failure(MyError()]
-///   .compactMap(extract(Result.success))
-/// // [42]
-/// ```
-///
-/// - Note: This function is only intended to be used with enum case initializers. Its behavior is
-///   otherwise undefined.
-/// - Parameter embed: An enum case initializer.
-/// - Returns: A function that can attempt to extract associated values from an enum.
-@available(*, deprecated, message: "Use a '@CasePathable' case property, instead")
-public func extract<Root, Value>(_ embed: @escaping @Sendable (Value) -> Root) -> (Root) -> Value? {
-  extractHelp(embed)
-}
-
-/// Returns a function that can attempt to extract associated values from the given enum case
-/// initializer.
-///
-/// Use this function to create new transform functions to pass to higher-order methods like
-/// `compactMap`:
-///
-/// ```swift
-/// [Result<Int, Error>.success(42), .failure(MyError()]
-///   .compactMap(extract(Result.success))
-/// // [42]
-/// ```
-///
-/// - Note: This function is only intended to be used with enum case initializers. Its behavior is
-///   otherwise undefined.
-/// - Parameter embed: An enum case initializer.
-/// - Returns: A function that can attempt to extract associated values from an enum.
-@available(*, deprecated, message: "Use a '@CasePathable' case property, instead")
-public func extract<Root, Value>(
-  _ embed: @escaping @Sendable (Value) -> Root?
-) -> @Sendable (Root?) -> Value? {
-  optionalPromotedExtractHelp(embed)
-}
diff --git a/Tests/KlaviyoSwiftTests/Vendor/ComposableArchitecture/TestStore.swift b/Tests/KlaviyoSwiftTests/Vendor/ComposableArchitecture/TestStore.swift
index da4ea112..b4ef4d42 100644
--- a/Tests/KlaviyoSwiftTests/Vendor/ComposableArchitecture/TestStore.swift
+++ b/Tests/KlaviyoSwiftTests/Vendor/ComposableArchitecture/TestStore.swift
@@ -1,4 +1,4 @@
-@_spi(Internals) import KCasePaths
+@testable @_spi(Internals) import KCasePaths
 import Combine
 import KConcurrencyExtras
 import CustomDump
diff --git a/Sources/CasePaths/XCTestSupport.swift b/Tests/KlaviyoSwiftTests/Vendor/ComposableArchitecture/XCTestSupport.swift
similarity index 79%
rename from Sources/CasePaths/XCTestSupport.swift
rename to Tests/KlaviyoSwiftTests/Vendor/ComposableArchitecture/XCTestSupport.swift
index 9bbe03a1..489d8beb 100644
--- a/Sources/CasePaths/XCTestSupport.swift
+++ b/Tests/KlaviyoSwiftTests/Vendor/ComposableArchitecture/XCTestSupport.swift
@@ -1,17 +1,6 @@
 import Foundation
 @_spi(CurrentTestCase) import XCTestDynamicOverlay
-
-/// Asserts that an enum value matches a particular case and modifies the associated value in place.
-@available(*, deprecated, message: "Use 'CasePathable.modify' to mutate an expected case, instead.")
-public func XCTModify<Wrapped>(
-  _ optional: inout Wrapped?,
-  _ message: @autoclosure () -> String = "",
-  _ body: (inout Wrapped) throws -> Void,
-  file: StaticString = #filePath,
-  line: UInt = #line
-) {
-  XCTModify(&optional, case: \.some, message(), body, file: file, line: line)
-}
+@testable import KCasePaths
 
 /// Asserts that an enum value matches a particular case and modifies the associated value in place.
 @available(*, deprecated, message: "Use 'CasePathable.modify' to mutate an expected case, instead.")