diff --git a/Package.resolved b/Package.resolved
index 13645f82e..f4b00bfce 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -33,8 +33,8 @@
         "repositoryURL": "https://github.com/apple/swift-argument-parser",
         "state": {
           "branch": null,
-          "revision": "4ad606ba5d7673ea60679a61ff867cc1ff8c8e86",
-          "version": "1.2.1"
+          "revision": "fee6933f37fde9a5e12a1e4aeaa93fe60116ff2a",
+          "version": "1.2.2"
         }
       },
       {
@@ -51,8 +51,8 @@
         "repositoryURL": "https://github.com/peripheryapp/swift-syntax",
         "state": {
           "branch": null,
-          "revision": "a2d31e8880224f5a619f24bf58c122836faf99ff",
-          "version": "1.0.0"
+          "revision": "d81f0bfa1e14446a8c42e94ff6d44fddf866d72e",
+          "version": "1.0.1"
         }
       },
       {
@@ -69,8 +69,8 @@
         "repositoryURL": "https://github.com/tuist/xcodeproj",
         "state": {
           "branch": null,
-          "revision": "b6de1bfe021b861c94e7c83821b595083f74b997",
-          "version": "8.8.0"
+          "revision": "fae27b48bc14ff3fd9b02902e48c4665ce5a0793",
+          "version": "8.9.0"
         }
       },
       {
@@ -78,8 +78,8 @@
         "repositoryURL": "https://github.com/jpsim/Yams",
         "state": {
           "branch": null,
-          "revision": "01835dc202670b5bb90d07f3eae41867e9ed29f6",
-          "version": "5.0.1"
+          "revision": "f47ba4838c30dbd59998a4e4c87ab620ff959e8a",
+          "version": "5.0.5"
         }
       }
     ]
diff --git a/Package.swift b/Package.swift
index bd9217a64..c3bab1134 100644
--- a/Package.swift
+++ b/Package.swift
@@ -7,7 +7,7 @@ var dependencies: [Package.Dependency] = [
     .package(url: "https://github.com/tadija/AEXML", from: "4.0.0"),
     .package(url: "https://github.com/apple/swift-argument-parser", from: "1.0.0"),
     .package(url: "https://github.com/kateinoigakukun/swift-indexstore", from: "0.0.0"),
-    .package(url: "https://github.com/peripheryapp/swift-syntax", .exact("1.0.0"))
+    .package(url: "https://github.com/peripheryapp/swift-syntax", .exact("1.0.1"))
 ]
 
 #if os(macOS)
diff --git a/Sources/PeripheryKit/Syntax/DeclarationSyntaxVisitor.swift b/Sources/PeripheryKit/Syntax/DeclarationSyntaxVisitor.swift
index bb602963d..fff3f0bb1 100644
--- a/Sources/PeripheryKit/Syntax/DeclarationSyntaxVisitor.swift
+++ b/Sources/PeripheryKit/Syntax/DeclarationSyntaxVisitor.swift
@@ -290,14 +290,14 @@ final class DeclarationSyntaxVisitor: PeripherySyntaxVisitor {
         guard node.initializer == nil,
               let identifier = node.pattern.as(IdentifierPatternSyntax.self)?.identifier,
               let parentStmt = node.parent?.parent?.parent,
-              (parentStmt.is(IfStmtSyntax.self) || parentStmt.is(GuardStmtSyntax.self))
+              (parentStmt.is(IfExprSyntax.self) || parentStmt.is(GuardStmtSyntax.self))
         else { return }
         letShorthandIdentifiers.insert(identifier.text)
     }
 
     func visit(_ node: FunctionCallExprSyntax) {
         if let identifierExpr = node.calledExpression.as(IdentifierExprSyntax.self),
-           identifierExpr.identifier.rawTokenKind == .capitalSelfKeyword {
+           identifierExpr.identifier.tokenKind == .keyword(.Self) {
             didVisitCapitalSelfFunctionCall = true
         }
     }
@@ -317,10 +317,10 @@ final class DeclarationSyntaxVisitor: PeripherySyntaxVisitor {
         consumeCapitalSelfFunctionCalls: Bool = false,
         at position: AbsolutePosition
     ) {
-        let modifierNames = modifiers?.withoutTrivia().map { $0.name.text } ?? []
+        let modifierNames = modifiers?.map { $0.name.text } ?? []
         let accessibility = modifierNames.mapFirst { Accessibility(rawValue: $0) }
-        let attributeNames = attributes?.withoutTrivia().compactMap {
-            AttributeSyntax($0)?.attributeName.text ?? CustomAttributeSyntax($0)?.attributeName.firstToken?.text
+        let attributeNames = attributes?.compactMap {
+            AttributeSyntax($0)?.attributeName.trimmedDescription ?? AttributeSyntax($0)?.attributeName.firstToken?.text
         } ?? []
         let location = sourceLocationBuilder.location(at: position)
         var letShorthandIdentifiers = Set<String>()
diff --git a/Sources/PeripheryKit/Syntax/ImportSyntaxVisitor.swift b/Sources/PeripheryKit/Syntax/ImportSyntaxVisitor.swift
index 50baf834f..cad0323a3 100644
--- a/Sources/PeripheryKit/Syntax/ImportSyntaxVisitor.swift
+++ b/Sources/PeripheryKit/Syntax/ImportSyntaxVisitor.swift
@@ -10,7 +10,7 @@ final class ImportSyntaxVisitor: PeripherySyntaxVisitor {
 
     func visit(_ node: ImportDeclSyntax) {
         let parts = node.path.map { $0.name.text }
-        let attributes = node.attributes?.compactMap { $0.as(AttributeSyntax.self)?.attributeName.text } ?? []
+        let attributes = node.attributes?.compactMap { $0.as(AttributeSyntax.self)?.attributeName.trimmedDescription } ?? []
         importStatements.append((parts, attributes.contains("testable")))
     }
 }
diff --git a/Sources/PeripheryKit/Syntax/TypeSyntaxInspector.swift b/Sources/PeripheryKit/Syntax/TypeSyntaxInspector.swift
index b8bd11bbf..e68d23bec 100644
--- a/Sources/PeripheryKit/Syntax/TypeSyntaxInspector.swift
+++ b/Sources/PeripheryKit/Syntax/TypeSyntaxInspector.swift
@@ -28,7 +28,7 @@ struct TypeSyntaxInspector {
         } else if let funcType = typeSyntax.as(FunctionTypeSyntax.self) {
             // Function type.
             let locations = funcType.arguments.flatMap { typeLocations(for: $0.type) }
-            return typeLocations(for: funcType.returnType).union(locations)
+            return typeLocations(for: funcType.output.returnType).union(locations)
         } else if let arrayType = typeSyntax.as(ArrayTypeSyntax.self) {
             // Array type.
             return typeLocations(for: arrayType.elementType)
diff --git a/Sources/PeripheryKit/Syntax/UnusedParameterParser.swift b/Sources/PeripheryKit/Syntax/UnusedParameterParser.swift
index 8ad177389..f1f19530b 100644
--- a/Sources/PeripheryKit/Syntax/UnusedParameterParser.swift
+++ b/Sources/PeripheryKit/Syntax/UnusedParameterParser.swift
@@ -206,7 +206,7 @@ struct UnusedParameterParser {
             if optBindingCondition.initializer == nil,
                let pattern = optBindingCondition.pattern.as(IdentifierPatternSyntax.self),
                let parentStmt = optBindingCondition.parent?.parent?.parent,
-               (parentStmt.is(IfStmtSyntax.self) || parentStmt.is(GuardStmtSyntax.self)) {
+               (parentStmt.is(IfExprSyntax.self) || parentStmt.is(GuardStmtSyntax.self)) {
                 // Handle `let x {}` syntax.
                 parsed = parse(identifier: pattern.identifier)
             } else {
@@ -335,7 +335,7 @@ struct UnusedParameterParser {
         let items = parse(node: body, collector)?.items ?? []
         let fullName = buildFullName(for: name, with: params)
         let genericParamNames = genericParams?.genericParameterList.compactMap { $0.name.text } ?? []
-        let attributeNames = attributes?.children(viewMode: .sourceAccurate).compactMap { AttributeSyntax($0)?.attributeName.text } ?? []
+        let attributeNames = attributes?.children(viewMode: .sourceAccurate).compactMap { AttributeSyntax($0)?.attributeName.trimmedDescription } ?? []
 
         let function = Function(
             name: name,