diff --git a/DEPS b/DEPS
index 65c748dd341..835c510b595 100644
--- a/DEPS
+++ b/DEPS
@@ -710,20 +710,4 @@ hooks = [
     'action': ['python3', 'sdk/build/vs_toolchain.py', 'update'],
     'condition': 'checkout_win'
   },
-  {
-    "name": "7zip",
-    "pattern": ".",
-    "action": [
-      "download_from_google_storage",
-      "--no_auth",
-      "--no_resume",
-      "--bucket",
-      "dart-dependencies",
-      "--platform=win32",
-      "--extract",
-      "-s",
-      Var('dart_root') + "/third_party/7zip.tar.gz.sha1",
-    ],
-    'condition': 'checkout_win'
-  },
 ]
diff --git a/sdk/BUILD.gn b/sdk/BUILD.gn
index 13900927b88..37348695ffe 100644
--- a/sdk/BUILD.gn
+++ b/sdk/BUILD.gn
@@ -280,19 +280,6 @@ foreach(library, _full_sdk_libraries) {
   ]
 }
 
-if (is_win) {
-  copy_tree_specs += [
-    {
-      target = "copy_7zip"
-      visibility = [ ":create_common_sdk" ]
-      deps = [ ":copy_libraries" ]
-      source = "../third_party/7zip"
-      dest = "$root_out_dir/dart-sdk/lib/_internal/pub/asset/7zip"
-      ignore_patterns = ".svn"
-    },
-  ]
-}
-
 # This generates targets for everything in copy_tree_specs. The targets have the
 # same name as the "target" fields in the scopes of copy_tree_specs.
 copy_trees("copy_trees") {
@@ -836,10 +823,6 @@ group("create_common_sdk") {
   if (dart_target_arch != "ia32") {
     public_deps += [ ":copy_dart2native" ]
   }
-
-  if (is_win) {
-    public_deps += [ ":copy_7zip" ]
-  }
 }
 
 # Parts specific to the platform SDK.
diff --git a/third_party/.gitignore b/third_party/.gitignore
index 0bd8a834a68..779e818cd02 100644
--- a/third_party/.gitignore
+++ b/third_party/.gitignore
@@ -7,7 +7,6 @@
 !pkg_tested
 !/tcmalloc
 !d8
-!7zip.tar.gz.sha1
 !firefox_jsshell
 !clang.tar.gz.sha1
 !unittest.tar.gz.sha1
diff --git a/third_party/7zip.tar.gz.sha1 b/third_party/7zip.tar.gz.sha1
deleted file mode 100644
index 83e790b503d..00000000000
--- a/third_party/7zip.tar.gz.sha1
+++ /dev/null
@@ -1 +0,0 @@
-22fe352b3c39c4281a599cf8576abef80ec44cc9
\ No newline at end of file
diff --git a/tools/bots/dart_sdk.py b/tools/bots/dart_sdk.py
index 019396922e4..d87632021c3 100755
--- a/tools/bots/dart_sdk.py
+++ b/tools/bots/dart_sdk.py
@@ -74,7 +74,6 @@ def CreateAndUploadSDKZip(arch, sdk_path):
     DartArchiveUploadSDKs(BUILD_OS, arch, sdk_zip)
 
 
-
 def DartArchiveUploadSDKs(system, arch, sdk_zip):
     namer = bot_utils.GCSNamer(CHANNEL, bot_utils.ReleaseType.RAW)
     git_number = utils.GetArchiveVersion()
@@ -171,26 +170,12 @@ def GsutilExists(gsu_path):
 
 
 def CreateZip(directory, target_file):
-    if 'win' in BUILD_OS:
-        CreateZipWindows(directory, target_file)
-    else:
-        CreateZipPosix(directory, target_file)
-
-
-def CreateZipPosix(directory, target_file):
-    with utils.ChangedWorkingDirectory(os.path.dirname(directory)):
-        command = ['zip', '-yrq9', target_file, os.path.basename(directory)]
-        Run(command)
-
-
-def CreateZipWindows(directory, target_file):
-    with utils.ChangedWorkingDirectory(os.path.dirname(directory)):
-        zip_win = os.path.join(bot_utils.DART_DIR, 'third_party', '7zip', '7za')
-        command = [
-            zip_win, 'a', '-tzip', target_file,
-            os.path.basename(directory)
-        ]
-        Run(command)
+    root = os.path.dirname(directory)
+    base = os.path.basename(directory)
+    f = shutil.make_archive(target_file, 'zip', root, base)
+    # make_archive will appened '.zip' to the filename, so we have to rename
+    # to avoid having it being '.zip.zip'
+    shutil.move(f, target_file)
 
 
 def FileDelete(f):