diff --git a/examples/flutter_gallery/pubspec.yaml b/examples/flutter_gallery/pubspec.yaml
index 4acf6549d99..af8981509de 100644
--- a/examples/flutter_gallery/pubspec.yaml
+++ b/examples/flutter_gallery/pubspec.yaml
@@ -1,7 +1,7 @@
 name: flutter_gallery
 dependencies:
-  intl: '>=0.12.4+2 <0.14.0'
-  collection: '>=1.4.0 <2.0.0'
+  collection: '>=1.9.1 <2.0.0'
+  intl: '>=0.14.0 <0.15.0'
   string_scanner: ^1.0.0
 
   flutter:
diff --git a/examples/stocks/pubspec.yaml b/examples/stocks/pubspec.yaml
index a8874daf281..096bd890841 100644
--- a/examples/stocks/pubspec.yaml
+++ b/examples/stocks/pubspec.yaml
@@ -2,7 +2,7 @@ name: stocks
 dependencies:
   flutter:
     path: ../../packages/flutter
-  intl: '>=0.12.4+2 <0.14.0'
+  intl: '>=0.14.0 <0.15.0'
 
 dev_dependencies:
   flutter_test:
diff --git a/packages/flutter/pubspec.yaml b/packages/flutter/pubspec.yaml
index ad0d1a45df8..4a18ee7e204 100644
--- a/packages/flutter/pubspec.yaml
+++ b/packages/flutter/pubspec.yaml
@@ -5,13 +5,10 @@ description: A framework for writing Flutter applications
 homepage: http://flutter.io
 
 dependencies:
-  collection: '>=1.4.0 <2.0.0'
-  intl: '>=0.12.4+2 <0.14.0'
-  vector_math: '>=2.0.3 <3.0.0'
-
-  crypto: '>=1.1.1 <3.0.0'
-
+  collection: '>=1.9.1 <2.0.0'
+  intl: '>=0.14.0 <0.15.0'
   meta: ^1.0.2
+  vector_math: '>=2.0.3 <3.0.0'
 
   sky_engine:
     path: ../../bin/cache/pkg/sky_engine
@@ -23,4 +20,4 @@ dev_dependencies:
     path: ../flutter_test
 
 environment:
-  sdk: '>=1.16.0 <2.0.0'
+  sdk: '>=1.19.0 <2.0.0'
diff --git a/packages/flutter_driver/pubspec.yaml b/packages/flutter_driver/pubspec.yaml
index 3644850e8f2..3939e2e5818 100644
--- a/packages/flutter_driver/pubspec.yaml
+++ b/packages/flutter_driver/pubspec.yaml
@@ -5,7 +5,7 @@ homepage: http://flutter.io
 author: Flutter Authors <flutter-dev@googlegroups.com>
 
 environment:
-  sdk: '>=1.16.0 <2.0.0'
+  sdk: '>=1.19.0 <2.0.0'
 
 dependencies:
   file: '^0.1.0'
diff --git a/packages/flutter_tools/pubspec.yaml b/packages/flutter_tools/pubspec.yaml
index 5bc3bff84bf..d2f75dfcf87 100644
--- a/packages/flutter_tools/pubspec.yaml
+++ b/packages/flutter_tools/pubspec.yaml
@@ -5,7 +5,7 @@ homepage: http://flutter.io
 author: Flutter Authors <flutter-dev@googlegroups.com>
 
 environment:
-  sdk: '>=1.16.0 <2.0.0'
+  sdk: '>=1.19.0 <2.0.0'
 
 dependencies:
   archive: ^1.0.20
diff --git a/packages/playfair/pubspec.yaml b/packages/playfair/pubspec.yaml
index 652bac26189..a7e39f1efb3 100644
--- a/packages/playfair/pubspec.yaml
+++ b/packages/playfair/pubspec.yaml
@@ -13,4 +13,4 @@ dev_dependencies:
     path: ../flutter_test
 
 environment:
-  sdk: '>=1.16.0 <2.0.0'
+  sdk: '>=1.19.0 <2.0.0'