diff --git a/DEPS b/DEPS
index 269e2fb691f1b..2f4336142204e 100644
--- a/DEPS
+++ b/DEPS
@@ -48,7 +48,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/main/DEPS
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': '35a9facce1915cd76055740aa106e5c2135c2d55',
+  'dart_revision': 'e517487c567962e03982e14152f54564c2dcf1e4',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -301,7 +301,7 @@ deps = {
    Var('chromium_git') + '/external/github.com/WebAssembly/binaryen.git@ec53f4b2d5b0d52ae703c5b696ecf052ad5fffbb',
 
   'src/third_party/dart/third_party/devtools':
-   {'packages': [{'version': 'git_revision:dd3fade2bd2ef74fc6102e56333a48f0efc594d3', 'package': 'dart/third_party/flutter/devtools'}], 'dep_type': 'cipd'},
+   {'packages': [{'package': 'dart/third_party/flutter/devtools', 'version': 'git_revision:dd3fade2bd2ef74fc6102e56333a48f0efc594d3'}], 'dep_type': 'cipd'},
 
   'src/third_party/dart/third_party/pkg/args':
    Var('dart_git') + '/args.git@da037acc018a8dd267d109eb634454490b7ff759',
@@ -466,7 +466,7 @@ deps = {
    Var('dart_git') + '/yaml_edit.git' + '@' + Var('dart_yaml_edit_rev'),
 
   'src/third_party/dart/tools/sdks':
-   {'packages': [{'version': 'version:2.19.0-374.0.dev', 'package': 'dart/dart-sdk/${{platform}}'}], 'dep_type': 'cipd'},
+   {'packages': [{'package': 'dart/dart-sdk/${{platform}}', 'version': 'version:2.19.0-374.0.dev'}], 'dep_type': 'cipd'},
 
   # WARNING: end of dart dependencies list that is cleaned up automatically - see create_updated_flutter_deps.py.
 
diff --git a/ci/format.bat b/ci/format.bat
index d82d64cec0221..35451118bc58e 100644
--- a/ci/format.bat
+++ b/ci/format.bat
@@ -28,5 +28,4 @@ cd "%ci_dir%"
 REM Do not use the CALL command in the next line to execute Dart. CALL causes
 REM Windows to re-read the line from disk after the CALL command has finished
 REM regardless of the ampersand chain.
-REM TODO(gspencergoog): Remove --no-sound-null-safety once isolate package is null-safe.
-"%dart%" --no-sound-null-safety --disable-dart-dev bin\format.dart %* & exit /B !ERRORLEVEL!
+"%dart%" --disable-dart-dev bin\format.dart %* & exit /B !ERRORLEVEL!
diff --git a/ci/format.sh b/ci/format.sh
index 50475df4df335..0425eb380eb7c 100755
--- a/ci/format.sh
+++ b/ci/format.sh
@@ -32,10 +32,8 @@ SRC_DIR="$(cd "$SCRIPT_DIR/../.."; pwd -P)"
 DART_SDK_DIR="${SRC_DIR}/third_party/dart/tools/sdks/dart-sdk"
 DART="${DART_SDK_DIR}/bin/dart"
 
-# TODO(gspencergoog): Remove --no-sound-null-safety once isolate package is null-safe.
 cd "$SCRIPT_DIR"
 "$DART" \
   --disable-dart-dev \
-  --no-sound-null-safety \
   bin/format.dart \
   "$@"
diff --git a/ci/licenses_golden/licenses_third_party b/ci/licenses_golden/licenses_third_party
index 723e8af790515..15801936dc0a4 100644
--- a/ci/licenses_golden/licenses_third_party
+++ b/ci/licenses_golden/licenses_third_party
@@ -1,4 +1,4 @@
-Signature: b90c42ec04793b821b5f62cd4af4ecb3
+Signature: 63cfa049a820981aee7d50bcca19f888
 
 UNUSED LICENSES:
 
diff --git a/shell/platform/fuchsia/dart_runner/dart_runner.cc b/shell/platform/fuchsia/dart_runner/dart_runner.cc
index c75e5c22556fb..eebe34ec5deef 100644
--- a/shell/platform/fuchsia/dart_runner/dart_runner.cc
+++ b/shell/platform/fuchsia/dart_runner/dart_runner.cc
@@ -55,6 +55,9 @@ const char* kDartVMArgs[] = {
 #if !defined(DART_PRODUCT) && (!defined(FLUTTER_PROFILE) || !defined(NDEBUG))
     "--enable_asserts",
 #endif
+    // Run in unsound null safety mode as some packages used in Integration
+    // testing have not been migrated yet.
+    "--no-sound-null-safety",
     // clang-format on
 };
 
diff --git a/shell/platform/fuchsia/flutter/component_v1.cc b/shell/platform/fuchsia/flutter/component_v1.cc
index bc58d846538f9..a024974c13b84 100644
--- a/shell/platform/fuchsia/flutter/component_v1.cc
+++ b/shell/platform/fuchsia/flutter/component_v1.cc
@@ -425,6 +425,10 @@ ComponentV1::ComponentV1(
 
   settings_.dart_flags = {};
 
+  // Run in unsound null safety mode as some packages used in Integration
+  // testing have not been migrated yet.
+  settings_.dart_flags.push_back("--no-sound-null-safety");
+
   // Don't collect CPU samples from Dart VM C++ code.
   settings_.dart_flags.push_back("--no_profile_vm");
 
diff --git a/shell/platform/fuchsia/flutter/component_v2.cc b/shell/platform/fuchsia/flutter/component_v2.cc
index 09fce7e806458..93504818d8915 100644
--- a/shell/platform/fuchsia/flutter/component_v2.cc
+++ b/shell/platform/fuchsia/flutter/component_v2.cc
@@ -488,6 +488,10 @@ ComponentV2::ComponentV2(
 
   settings_.dart_flags = {};
 
+  // Run in unsound null safety mode as some packages used in Integration
+  // testing have not been migrated yet.
+  settings_.dart_flags.push_back("--no-sound-null-safety");
+
   // Don't collect CPU samples from Dart VM C++ code.
   settings_.dart_flags.push_back("--no_profile_vm");