diff --git a/Package.resolved b/Package.resolved
index fce112b..ee26df8 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -5,8 +5,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/pointfreeco/swift-case-paths",
       "state" : {
-        "revision" : "fc45e7b2cfece9dd80b5a45e6469ffe67fe67984",
-        "version" : "0.14.1"
+        "revision" : "b871e5ed11a23e52c2896a92ce2c829982ff8619",
+        "version" : "1.4.2"
       }
     },
     {
@@ -32,8 +32,17 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/pointfreeco/swift-parsing",
       "state" : {
-        "revision" : "27c941bbd22a4bbc53005a15a0440443fd892f70",
-        "version" : "0.12.1"
+        "revision" : "a0e7d73f462c1c38c59dc40a3969ac40cea42950",
+        "version" : "0.13.0"
+      }
+    },
+    {
+      "identity" : "swift-syntax",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-syntax",
+      "state" : {
+        "revision" : "303e5c5c36d6a558407d364878df131c3546fad8",
+        "version" : "510.0.2"
       }
     },
     {
@@ -41,8 +50,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/pointfreeco/xctest-dynamic-overlay",
       "state" : {
-        "revision" : "4af50b38daf0037cfbab15514a241224c3f62f98",
-        "version" : "0.8.5"
+        "revision" : "6f30bdba373bbd7fbfe241dddd732651f2fbd1e2",
+        "version" : "1.1.2"
       }
     }
   ],
diff --git a/Tests/MathParserTests/MathParserTests.swift b/Tests/MathParserTests/MathParserTests.swift
index 833b746..c2552e1 100644
--- a/Tests/MathParserTests/MathParserTests.swift
+++ b/Tests/MathParserTests/MathParserTests.swift
@@ -668,4 +668,27 @@ error: unexpected input
     XCTAssertEqual(cos(Double.pi / 3), parser.parse("cos(60)")?.value)
     XCTAssertEqual(atan2(1.0, 1.0) * 180.0 / Double.pi, parser.parse("atan2(1.0, 1.0)")?.value)
   }
+
+  func testMod() {
+    XCTAssertEqual(5.truncatingRemainder(dividingBy: 3), parser.parse("mod(5, 3)")?.value)
+    XCTAssertEqual(3.truncatingRemainder(dividingBy: 5), parser.parse("mod(3, 5)")?.value)
+    XCTAssertEqual(55.truncatingRemainder(dividingBy: 3), parser.parse("mod(55, 3)")?.value)
+    XCTAssertEqual(35.truncatingRemainder(dividingBy: 5), parser.parse("mod(35, 5)")?.value)
+
+    XCTAssertEqual(-2, parser.parse("mod(-5, 3)")?.value)
+    XCTAssertEqual(-3, parser.parse("mod(-3, 5)")?.value)
+    XCTAssertEqual(-1, parser.parse("mod(-55, 3)")?.value)
+    XCTAssertEqual(0, parser.parse("mod(-35, 5)")?.value)
+
+    XCTAssertEqual(2, parser.parse("mod(5, -3)")?.value)
+    XCTAssertEqual(3, parser.parse("mod(3, -5)")?.value)
+    XCTAssertEqual(1, parser.parse("mod(55, -3)")?.value)
+    XCTAssertEqual(0, parser.parse("mod(35, -5)")?.value)
+
+    XCTAssertEqual(-2, parser.parse("mod(-5, -3)")?.value)
+    XCTAssertEqual(-3, parser.parse("mod(-3, -5)")?.value)
+    XCTAssertEqual(-1, parser.parse("mod(-55, -3)")?.value)
+    XCTAssertEqual(0, parser.parse("mod(-35, -5)")?.value)
+  }
 }
+