diff --git a/DEPS b/DEPS
index db7aa286c7a9..a2608274f73e 100644
--- a/DEPS
+++ b/DEPS
@@ -54,7 +54,7 @@ vars = {
 
   # co19 is a cipd package automatically generated for each co19 commit.
   # Use tests/co19/update.sh to update this hash.
-  "co19_rev": "b5126f0bd51ea0819df8d5c362574f951a564940",
+  "co19_rev": "dadc1781676fe5562917ac6bc5ea38da64abe76a",
 
   # The internal benchmarks to use. See go/dart-benchmarks-internal
   "benchmarks_internal_rev": "f048a4a853e3062056d39c3db100acdde42f16d6",
diff --git a/pkg/dartdev/lib/src/commands/compile.dart b/pkg/dartdev/lib/src/commands/compile.dart
index 3e4aa8980bf8..7b915ad38dda 100644
--- a/pkg/dartdev/lib/src/commands/compile.dart
+++ b/pkg/dartdev/lib/src/commands/compile.dart
@@ -10,7 +10,6 @@ import 'package:dart2native/generate.dart';
 import 'package:dart2wasm/generate_wasm.dart';
 import 'package:front_end/src/api_prototype/compiler_options.dart'
     show Verbosity;
-import 'package:front_end/src/api_unstable/vm.dart' as fe;
 import 'package:path/path.dart' as path;
 import 'package:vm/target_os.dart'; // For possible --target-os values.
 
@@ -559,9 +558,6 @@ class CompileWasmCommand extends CompileSubcommandCommand {
       options.translatorOptions.importSharedMemory = true;
       options.translatorOptions.sharedMemoryMaxPages = maxPages;
     }
-    // Enable inline classes.
-    // TODO: Remove this when inline classe ship.
-    options.feExperimentalFlags = {fe.ExperimentalFlag.inlineClass: true};
 
     int result;
     try {
diff --git a/tools/VERSION b/tools/VERSION
index 205260d7012f..a99e1bcf1d04 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -27,5 +27,5 @@ CHANNEL dev
 MAJOR 3
 MINOR 4
 PATCH 0
-PRERELEASE 50
+PRERELEASE 51
 PRERELEASE_PATCH 0