diff --git a/exercises/practice/armstrong-numbers/.meta/Sources/ArmstrongNumbers/ArmstrongNumbersExample.swift b/exercises/practice/armstrong-numbers/.meta/Sources/ArmstrongNumbers/ArmstrongNumbersExample.swift
index df0d8576a..4316e4857 100644
--- a/exercises/practice/armstrong-numbers/.meta/Sources/ArmstrongNumbers/ArmstrongNumbersExample.swift
+++ b/exercises/practice/armstrong-numbers/.meta/Sources/ArmstrongNumbers/ArmstrongNumbersExample.swift
@@ -1,6 +1,6 @@
 import Foundation
 
-func isArmstrongNumber(_ number: Int) -> Bool {
+func isArmstrongNumber(_ number: Int128) -> Bool {
     let stringNumber = String(number)
     let numberLength = stringNumber.count
     let sum = stringNumber.compactMap { Int(String($0)) }.reduce(0) { $0 + Int(pow(Double($1), Double(numberLength))) }
diff --git a/exercises/practice/armstrong-numbers/.meta/template.swift b/exercises/practice/armstrong-numbers/.meta/template.swift
index 0ae784d07..200c862fb 100644
--- a/exercises/practice/armstrong-numbers/.meta/template.swift
+++ b/exercises/practice/armstrong-numbers/.meta/template.swift
@@ -1,20 +1,22 @@
-import XCTest
+import Testing
+import Foundation
 @testable import {{exercise|camelCase}}
-class {{exercise|camelCase}}Tests: XCTestCase {
-    let runAll = Bool(ProcessInfo.processInfo.environment["RUNALL", default: "false"]) ?? false
 
-    {% for case in cases %}
-    {% if forloop.first -%}
-        func test{{case.description |camelCase }}() {
-    {% else -%}
-        func test{{case.description |camelCase }}() throws {
-        try XCTSkipIf(true && !runAll) // change true to false to run this test
-    {% endif -%}
-        {%- if case.expected -%}
-        XCTAssertTrue(isArmstrongNumber({{case.input.number}}))
-        {%- else -%}
-        XCTAssertFalse(isArmstrongNumber({{case.input.number}}))
-        {%- endif %}
-    }
-    {% endfor -%}
+let RUNALL = Bool(ProcessInfo.processInfo.environment["RUNALL", default: "false"]) ?? false
+
+{% for case in cases %}
+{% if forloop.first -%}
+    @Test("{{case.description}}")
+    func test{{case.description |camelCase }}() {
+{% else -%}
+    @Test("{{case.description}}", .enabled(if: RUNALL))
+    func test{{case.description |camelCase }}() throws {
+{% endif -%}
+    {%- if case.expected -%}
+    #expect(isArmstrongNumber({{case.input.number}}))
+    {%- else -%}
+    #expect(isArmstrongNumber({{case.input.number}}))
+    {%- endif %}
 }
+{% endfor -%}
+
diff --git a/exercises/practice/armstrong-numbers/.meta/tests.toml b/exercises/practice/armstrong-numbers/.meta/tests.toml
index b956bdfd4..b3f09e4cc 100644
--- a/exercises/practice/armstrong-numbers/.meta/tests.toml
+++ b/exercises/practice/armstrong-numbers/.meta/tests.toml
@@ -38,8 +38,6 @@ description = "Seven-digit number that is not an Armstrong number"
 
 [5ee2fdf8-334e-4a46-bb8d-e5c19c02c148]
 description = "Armstrong number containing seven zeroes"
-include = false
 
 [12ffbf10-307a-434e-b4ad-c925680e1dd4]
 description = "The largest and last Armstrong number"
-include = false
diff --git a/exercises/practice/armstrong-numbers/Package.swift b/exercises/practice/armstrong-numbers/Package.swift
index 9cc117728..bffadd5dd 100644
--- a/exercises/practice/armstrong-numbers/Package.swift
+++ b/exercises/practice/armstrong-numbers/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:5.3
+// swift-tools-version:6.0
 
 import PackageDescription
 
diff --git a/exercises/practice/armstrong-numbers/Sources/ArmstrongNumbers/ArmstrongNumbers.swift b/exercises/practice/armstrong-numbers/Sources/ArmstrongNumbers/ArmstrongNumbers.swift
index 63b122561..765387f1f 100644
--- a/exercises/practice/armstrong-numbers/Sources/ArmstrongNumbers/ArmstrongNumbers.swift
+++ b/exercises/practice/armstrong-numbers/Sources/ArmstrongNumbers/ArmstrongNumbers.swift
@@ -1,3 +1,3 @@
-func isArmstrongNumber(_ number: Int) -> Bool {
+func isArmstrongNumber(_ number: Int128) -> Bool {
     // Write your code for the 'Armstrong Numbers' exercise here.
 }
diff --git a/exercises/practice/armstrong-numbers/Tests/ArmstrongNumbersTests/ArmstrongNumbersTests.swift b/exercises/practice/armstrong-numbers/Tests/ArmstrongNumbersTests/ArmstrongNumbersTests.swift
index e99683b94..eec3a62b4 100644
--- a/exercises/practice/armstrong-numbers/Tests/ArmstrongNumbersTests/ArmstrongNumbersTests.swift
+++ b/exercises/practice/armstrong-numbers/Tests/ArmstrongNumbersTests/ArmstrongNumbersTests.swift
@@ -1,51 +1,61 @@
-import XCTest
+import Testing
+import Foundation
 
 @testable import ArmstrongNumbers
 
-class ArmstrongNumbersTests: XCTestCase {
-  let runAll = Bool(ProcessInfo.processInfo.environment["RUNALL", default: "false"]) ?? false
-
-  func testZeroIsAnArmstrongNumber() {
-    XCTAssertTrue(isArmstrongNumber(0))
-  }
-
-  func testSingleDigitNumbersAreArmstrongNumbers() throws {
-    try XCTSkipIf(true && !runAll)  // change true to false to run this test
-    XCTAssertTrue(isArmstrongNumber(5))
-  }
-
-  func testThereAreNoTwoDigitArmstrongNumbers() throws {
-    try XCTSkipIf(true && !runAll)  // change true to false to run this test
-    XCTAssertFalse(isArmstrongNumber(10))
-  }
-
-  func testThreeDigitNumberThatIsAnArmstrongNumber() throws {
-    try XCTSkipIf(true && !runAll)  // change true to false to run this test
-    XCTAssertTrue(isArmstrongNumber(153))
-  }
-
-  func testThreeDigitNumberThatIsNotAnArmstrongNumber() throws {
-    try XCTSkipIf(true && !runAll)  // change true to false to run this test
-    XCTAssertFalse(isArmstrongNumber(100))
-  }
-
-  func testFourDigitNumberThatIsAnArmstrongNumber() throws {
-    try XCTSkipIf(true && !runAll)  // change true to false to run this test
-    XCTAssertTrue(isArmstrongNumber(9474))
-  }
-
-  func testFourDigitNumberThatIsNotAnArmstrongNumber() throws {
-    try XCTSkipIf(true && !runAll)  // change true to false to run this test
-    XCTAssertFalse(isArmstrongNumber(9475))
-  }
-
-  func testSevenDigitNumberThatIsAnArmstrongNumber() throws {
-    try XCTSkipIf(true && !runAll)  // change true to false to run this test
-    XCTAssertTrue(isArmstrongNumber(9_926_315))
-  }
-
-  func testSevenDigitNumberThatIsNotAnArmstrongNumber() throws {
-    try XCTSkipIf(true && !runAll)  // change true to false to run this test
-    XCTAssertFalse(isArmstrongNumber(9_926_314))
-  }
+let RUNALL = Bool(ProcessInfo.processInfo.environment["RUNALL", default: "false"]) ?? false
+
+@Test("Zero is an Armstrong number")
+func testZeroIsAnArmstrongNumber() {
+  #expect(isArmstrongNumber(0))
+}
+
+@Test("Single-digit numbers are Armstrong numbers", .enabled(if: RUNALL))
+func testSingleDigitNumbersAreArmstrongNumbers() throws {
+  #expect(isArmstrongNumber(5))
+}
+
+@Test("There are no two-digit Armstrong numbers", .enabled(if: RUNALL))
+func testThereAreNoTwoDigitArmstrongNumbers() throws {
+  #expect(isArmstrongNumber(10))
+}
+
+@Test("Three-digit number that is an Armstrong number", .enabled(if: RUNALL))
+func testThreeDigitNumberThatIsAnArmstrongNumber() throws {
+  #expect(isArmstrongNumber(153))
+}
+
+@Test("Three-digit number that is not an Armstrong number", .enabled(if: RUNALL))
+func testThreeDigitNumberThatIsNotAnArmstrongNumber() throws {
+  #expect(isArmstrongNumber(100))
+}
+
+@Test("Four-digit number that is an Armstrong number", .enabled(if: RUNALL))
+func testFourDigitNumberThatIsAnArmstrongNumber() throws {
+  #expect(isArmstrongNumber(9474))
+}
+
+@Test("Four-digit number that is not an Armstrong number", .enabled(if: RUNALL))
+func testFourDigitNumberThatIsNotAnArmstrongNumber() throws {
+  #expect(isArmstrongNumber(9475))
+}
+
+@Test("Seven-digit number that is an Armstrong number", .enabled(if: RUNALL))
+func testSevenDigitNumberThatIsAnArmstrongNumber() throws {
+  #expect(isArmstrongNumber(9_926_315))
+}
+
+@Test("Seven-digit number that is not an Armstrong number", .enabled(if: RUNALL))
+func testSevenDigitNumberThatIsNotAnArmstrongNumber() throws {
+  #expect(isArmstrongNumber(9_926_314))
+}
+
+@Test("Armstrong number containing seven zeroes", .enabled(if: RUNALL))
+func testArmstrongNumberContainingSevenZeroes() throws {
+  #expect(isArmstrongNumber(186_709_961_001_538_790_100_634_132_976_990))
+}
+
+@Test("The largest and last Armstrong number", .enabled(if: RUNALL))
+func testTheLargestAndLastArmstrongNumber() throws {
+  #expect(isArmstrongNumber(115_132_219_018_763_992_565_095_597_973_971_522_401))
 }