diff --git a/.dart_tool/package_config.json b/.dart_tool/package_config.json
index 8400a1c9294..cba63c1213c 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": "2021-02-23T11:38:53.873726",
+  "generated": "2021-02-24T07:33:35.310314",
   "generator": "tools/generate_package_config.dart",
   "packages": [
     {
@@ -569,7 +569,7 @@
       "name": "shelf_packages_handler",
       "rootUri": "../third_party/pkg/shelf_packages_handler",
       "packageUri": "lib/",
-      "languageVersion": "2.0"
+      "languageVersion": "2.12"
     },
     {
       "name": "shelf_proxy",
@@ -581,13 +581,13 @@
       "name": "shelf_static",
       "rootUri": "../third_party/pkg/shelf_static",
       "packageUri": "lib/",
-      "languageVersion": "2.3"
+      "languageVersion": "2.12"
     },
     {
       "name": "shelf_web_socket",
       "rootUri": "../third_party/pkg/shelf_web_socket",
       "packageUri": "lib/",
-      "languageVersion": "2.1"
+      "languageVersion": "2.12"
     },
     {
       "name": "smith",
diff --git a/DEPS b/DEPS
index 6c5771302a3..436dc5de902 100644
--- a/DEPS
+++ b/DEPS
@@ -140,11 +140,11 @@ vars = {
   "resource_rev": "6b79867d0becf5395e5819a75720963b8298e9a7",
   "root_certificates_rev": "7e5ec82c99677a2e5b95ce296c4d68b0d3378ed8",
   "rust_revision": "b7856f695d65a8ebc846754f97d15814bcb1c244",
-  "shelf_static_rev": "779a6e99b320ce9ed4ff6b88bd0cdc40ea5c62c4",
-  "shelf_packages_handler_tag": "2.0.0",
+  "shelf_static_rev": "bafde9eaddb5d02040a614e41deddd971b4d67e6",
+  "shelf_packages_handler_rev": "78302e67c035047e6348e692b0c1182131f0fe35",
   "shelf_proxy_tag": "0.1.0+7",
   "shelf_rev": "fa5afaa38bd51dedeeaa25b7bfd8822cabbcc57f",
-  "shelf_web_socket_rev": "dedd6040d45159bd0661eb5252c7e936d6b7514a",
+  "shelf_web_socket_rev": "091d2ed2105827b7f376668fafc88b2b8c845d71",
   "source_map_stack_trace_rev": "1c3026f69d9771acf2f8c176a1ab750463309cce",
   "source_maps-0.9.4_rev": "38524",
   "source_maps_rev": "53eb92ccfe6e64924054f83038a534b959b12b3e",
@@ -407,7 +407,7 @@ deps = {
       Var("dart_git") + "shelf.git" + "@" + Var("shelf_rev"),
   Var("dart_root") + "/third_party/pkg/shelf_packages_handler":
       Var("dart_git") + "shelf_packages_handler.git"
-      + "@" + Var("shelf_packages_handler_tag"),
+      + "@" + Var("shelf_packages_handler_rev"),
   Var("dart_root") + "/third_party/pkg/shelf_proxy":
       Var("dart_git") + "shelf_proxy.git" + "@" + Var("shelf_proxy_tag"),
   Var("dart_root") + "/third_party/pkg/shelf_static":