diff --git a/.swift-version b/.swift-version
index 913671cd..23ee9ab8 100644
--- a/.swift-version
+++ b/.swift-version
@@ -1 +1 @@
-6.2
\ No newline at end of file
+6.3-snapshot-2026-02-27
\ No newline at end of file
diff --git a/Sources/Containerization/VZVirtualMachine+Helpers.swift b/Sources/Containerization/VZVirtualMachine+Helpers.swift
index 1c3ae3da..2cbadb1c 100644
--- a/Sources/Containerization/VZVirtualMachine+Helpers.swift
+++ b/Sources/Containerization/VZVirtualMachine+Helpers.swift
@@ -123,7 +123,7 @@ extension VZVirtualMachine {
 
 extension VZVirtualMachine {
     func waitForAgent(queue: DispatchQueue) async throws -> FileHandle {
-        let agentConnectionRetryCount: Int = 150
+        let agentConnectionRetryCount: Int = 200
         let agentConnectionSleepDuration: Duration = .milliseconds(20)
 
         for _ in 0...agentConnectionRetryCount {
@@ -134,7 +134,7 @@ extension VZVirtualMachine {
                 continue
             }
         }
-        throw ContainerizationError(.invalidArgument, message: "no connection to agent socket")
+        throw ContainerizationError(.timeout, message: "failed to get a connection to agent socket")
     }
 }
 
diff --git a/vminitd/Makefile b/vminitd/Makefile
index 7b3c9947..14b27c53 100644
--- a/vminitd/Makefile
+++ b/vminitd/Makefile
@@ -17,8 +17,8 @@ WARNINGS_AS_ERRORS ?= true
 SWIFT_WARNING_CONFIG := $(if $(filter-out false,$(WARNINGS_AS_ERRORS)),-Xswiftc -warnings-as-errors)
 SWIFT_CONFIGURATION := --swift-sdk aarch64-swift-linux-musl $(SWIFT_WARNING_CONFIG) -Xlinker -s --disable-automatic-resolution
 
-SWIFT_VERSION := 6.2.3
-SWIFT_SDK_URL := https://download.swift.org/swift-6.2.3-release/static-sdk/swift-6.2.3-RELEASE/swift-6.2.3-RELEASE_static-linux-0.0.1.artifactbundle.tar.gz
+SWIFT_VERSION := 6.3-snapshot-2026-02-27
+SWIFT_SDK_URL := https://download.swift.org/swift-6.3-branch/static-sdk/swift-6.3-DEVELOPMENT-SNAPSHOT-2026-02-27-a/swift-6.3-DEVELOPMENT-SNAPSHOT-2026-02-27-a_static-linux-0.1.0.artifactbundle.tar.gz
 SWIFT_SDK_PATH := /tmp/$(notdir $(SWIFT_SDK_URL))
 
 SWIFTLY_URL := https://download.swift.org/swiftly/darwin/swiftly.pkg
diff --git a/vminitd/Package.swift b/vminitd/Package.swift
index 5943ffbd..8722193e 100644
--- a/vminitd/Package.swift
+++ b/vminitd/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version: 6.2
+// swift-tools-version: 6.3
 //===----------------------------------------------------------------------===//
 // Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
 //