diff --git a/.dart_tool/package_config.json b/.dart_tool/package_config.json
index d50d6f5ef0c..0d8297b653e 100644
--- a/.dart_tool/package_config.json
+++ b/.dart_tool/package_config.json
@@ -11,7 +11,7 @@
     "constraint, update this by running tools/generate_package_config.dart."
   ],
   "configVersion": 2,
-  "generated": "2021-11-15T17:34:02.415038",
+  "generated": "2021-12-09T13:52:42.287379",
   "generator": "tools/generate_package_config.dart",
   "packages": [
     {
@@ -760,7 +760,7 @@
       "name": "vm",
       "rootUri": "../pkg/vm",
       "packageUri": "lib/",
-      "languageVersion": "2.12"
+      "languageVersion": "2.15"
     },
     {
       "name": "vm_service",
diff --git a/pkg/vm/lib/transformations/type_flow/transformer.dart b/pkg/vm/lib/transformations/type_flow/transformer.dart
index 1868a4db620..aa9af8f2671 100644
--- a/pkg/vm/lib/transformations/type_flow/transformer.dart
+++ b/pkg/vm/lib/transformations/type_flow/transformer.dart
@@ -315,13 +315,7 @@ class AnnotateKernel extends RecursiveVisitor {
     Constant? constantValue;
     bool isInt = false;
 
-    // Note: the explicit type `bool` is needed because the checked-in version
-    // of the CFE that we use for bootstrapping doesn't yet have constructor
-    // tearoffs enabled, and the fix for bug
-    // https://github.com/dart-lang/language/issues/1785 only takes effect when
-    // constructor tearoffs are enabled.  TODO(paulberry): remove the type after
-    // the bootstrap CFE enables constructor tearoffs.
-    final bool nullable = type is NullableType;
+    final nullable = type is NullableType;
     if (nullable) {
       type = type.baseType;
     }
diff --git a/pkg/vm/pubspec.yaml b/pkg/vm/pubspec.yaml
index 3ae9534c209..4086172060c 100644
--- a/pkg/vm/pubspec.yaml
+++ b/pkg/vm/pubspec.yaml
@@ -4,7 +4,7 @@ description: VM specific Dart code and helper scripts
 publish_to: none
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.15.0 <3.0.0'
 
 dependencies:
   args: ^2.0.0