diff --git a/recipes/README.recipes.md b/recipes/README.recipes.md
index 89291f1951..3220b84589 100644
--- a/recipes/README.recipes.md
+++ b/recipes/README.recipes.md
@@ -534,7 +534,7 @@ upload.
 Args:
   * branch (str): new branch name, which must not yet exist.
   * name (str): step name.
-  * upstream (str): to origin/main.
+  * upstream (str): to origin/master.
   * kwargs: Forwarded to '__call__'.
 
 — **def [rebase](/recipes/recipe_modules/git/api.py#328)(self, name_prefix, branch, dir_path, remote_name=None, \*\*kwargs):**
diff --git a/recipes/recipe_modules/git/api.py b/recipes/recipe_modules/git/api.py
index b193a34cd0..e4390f713f 100644
--- a/recipes/recipe_modules/git/api.py
+++ b/recipes/recipe_modules/git/api.py
@@ -211,16 +211,16 @@ class GitApi(recipe_api.RecipeApi):
 
       # There are five kinds of refs we can be handed:
       # 0) None. In this case, we default to api.buildbucket.gitiles_commit.ref.
-      # 1) A fully qualified branch name, e.g. 'refs/heads/main'.
+      # 1) A fully qualified branch name, e.g. 'refs/heads/master'.
       #    Chop off 'refs/heads/' and now it matches case (4).
       # 2) A 40-character SHA1 hash.
       # 3) A fully-qualifed arbitrary ref, e.g. 'refs/foo/bar/baz'.
-      # 4) A branch name, e.g. 'main'.
+      # 4) A branch name, e.g. 'master'.
       # Note that 'FETCH_HEAD' can be many things (and therefore not a valid
       # checkout target) if many refs are fetched, but we only explicitly fetch
       # one ref here, so this is safe.
       if not ref:                                  # Case 0.
-        ref = self.m.buildbucket.gitiles_commit.ref or 'HEAD'
+        ref = self.m.buildbucket.gitiles_commit.ref or 'master'
 
       # If it's a fully-qualified branch name, trim the 'refs/heads/' prefix.
       if ref.startswith('refs/heads/'):            # Case 1.
@@ -396,7 +396,7 @@ class GitApi(recipe_api.RecipeApi):
     Args:
       * branch (str): new branch name, which must not yet exist.
       * name (str): step name.
-      * upstream (str): to origin/main.
+      * upstream (str): to origin/master.
       * kwargs: Forwarded to '__call__'.
     """
     env = self.m.context.env
diff --git a/recipes/recipe_modules/git/examples/full.expected/basic.json b/recipes/recipe_modules/git/examples/full.expected/basic.json
index 7b3b676197..176c6af755 100644
--- a/recipes/recipe_modules/git/examples/full.expected/basic.json
+++ b/recipes/recipe_modules/git/examples/full.expected/basic.json
@@ -16,7 +16,7 @@
       "git",
       "fetch",
       "origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress"
     ],
diff --git a/recipes/recipe_modules/git/examples/full.expected/basic_file_name.json b/recipes/recipe_modules/git/examples/full.expected/basic_file_name.json
index 97c1d02d80..1275a56736 100644
--- a/recipes/recipe_modules/git/examples/full.expected/basic_file_name.json
+++ b/recipes/recipe_modules/git/examples/full.expected/basic_file_name.json
@@ -16,7 +16,7 @@
       "git",
       "fetch",
       "origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress"
     ],
diff --git a/recipes/recipe_modules/git/examples/full.expected/basic_submodule_update_force.json b/recipes/recipe_modules/git/examples/full.expected/basic_submodule_update_force.json
index 5798c2028b..b464689b26 100644
--- a/recipes/recipe_modules/git/examples/full.expected/basic_submodule_update_force.json
+++ b/recipes/recipe_modules/git/examples/full.expected/basic_submodule_update_force.json
@@ -16,7 +16,7 @@
       "git",
       "fetch",
       "origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress"
     ],
diff --git a/recipes/recipe_modules/git/examples/full.expected/basic_tags.json b/recipes/recipe_modules/git/examples/full.expected/basic_tags.json
index 8dc9372347..c82fc0f387 100644
--- a/recipes/recipe_modules/git/examples/full.expected/basic_tags.json
+++ b/recipes/recipe_modules/git/examples/full.expected/basic_tags.json
@@ -16,7 +16,7 @@
       "git",
       "fetch",
       "origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress",
       "--tags"
diff --git a/recipes/recipe_modules/git/examples/full.expected/can_fail_build.json b/recipes/recipe_modules/git/examples/full.expected/can_fail_build.json
index 9562d7bebd..bbe7b50f97 100644
--- a/recipes/recipe_modules/git/examples/full.expected/can_fail_build.json
+++ b/recipes/recipe_modules/git/examples/full.expected/can_fail_build.json
@@ -16,7 +16,7 @@
       "git",
       "fetch",
       "origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress"
     ],
diff --git a/recipes/recipe_modules/git/examples/full.expected/cannot_fail_build.json b/recipes/recipe_modules/git/examples/full.expected/cannot_fail_build.json
index c0ad995401..c41a265ec5 100644
--- a/recipes/recipe_modules/git/examples/full.expected/cannot_fail_build.json
+++ b/recipes/recipe_modules/git/examples/full.expected/cannot_fail_build.json
@@ -16,7 +16,7 @@
       "git",
       "fetch",
       "origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress"
     ],
diff --git a/recipes/recipe_modules/git/examples/full.expected/count-objects_delta.json b/recipes/recipe_modules/git/examples/full.expected/count-objects_delta.json
index f6474708fd..8cef208cd5 100644
--- a/recipes/recipe_modules/git/examples/full.expected/count-objects_delta.json
+++ b/recipes/recipe_modules/git/examples/full.expected/count-objects_delta.json
@@ -37,7 +37,7 @@
       "git",
       "fetch",
       "origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress"
     ],
diff --git a/recipes/recipe_modules/git/examples/full.expected/count-objects_failed.json b/recipes/recipe_modules/git/examples/full.expected/count-objects_failed.json
index 0d1d714124..7b036a1b1d 100644
--- a/recipes/recipe_modules/git/examples/full.expected/count-objects_failed.json
+++ b/recipes/recipe_modules/git/examples/full.expected/count-objects_failed.json
@@ -16,7 +16,7 @@
       "git",
       "fetch",
       "origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress"
     ],
diff --git a/recipes/recipe_modules/git/examples/full.expected/count-objects_with_bad_output.json b/recipes/recipe_modules/git/examples/full.expected/count-objects_with_bad_output.json
index 77197bba96..2f0af94031 100644
--- a/recipes/recipe_modules/git/examples/full.expected/count-objects_with_bad_output.json
+++ b/recipes/recipe_modules/git/examples/full.expected/count-objects_with_bad_output.json
@@ -16,7 +16,7 @@
       "git",
       "fetch",
       "origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress"
     ],
diff --git a/recipes/recipe_modules/git/examples/full.expected/count-objects_with_bad_output_fails_build.json b/recipes/recipe_modules/git/examples/full.expected/count-objects_with_bad_output_fails_build.json
index e0b07f29c7..6b63b36bc8 100644
--- a/recipes/recipe_modules/git/examples/full.expected/count-objects_with_bad_output_fails_build.json
+++ b/recipes/recipe_modules/git/examples/full.expected/count-objects_with_bad_output_fails_build.json
@@ -16,7 +16,7 @@
       "git",
       "fetch",
       "origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress"
     ],
diff --git a/recipes/recipe_modules/git/examples/full.expected/git-cache-checkout.json b/recipes/recipe_modules/git/examples/full.expected/git-cache-checkout.json
index d62f991701..08c4aa43f8 100644
--- a/recipes/recipe_modules/git/examples/full.expected/git-cache-checkout.json
+++ b/recipes/recipe_modules/git/examples/full.expected/git-cache-checkout.json
@@ -64,7 +64,7 @@
       "git",
       "fetch",
       "origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress"
     ],
diff --git a/recipes/recipe_modules/git/examples/full.expected/platform_win.json b/recipes/recipe_modules/git/examples/full.expected/platform_win.json
index c18c699023..140a12904d 100644
--- a/recipes/recipe_modules/git/examples/full.expected/platform_win.json
+++ b/recipes/recipe_modules/git/examples/full.expected/platform_win.json
@@ -16,7 +16,7 @@
       "git",
       "fetch",
       "origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress"
     ],
diff --git a/recipes/recipe_modules/git/examples/full.expected/rebase_failed.json b/recipes/recipe_modules/git/examples/full.expected/rebase_failed.json
index c5bf11828e..d6df9e2701 100644
--- a/recipes/recipe_modules/git/examples/full.expected/rebase_failed.json
+++ b/recipes/recipe_modules/git/examples/full.expected/rebase_failed.json
@@ -16,7 +16,7 @@
       "git",
       "fetch",
       "origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress"
     ],
diff --git a/recipes/recipe_modules/git/examples/full.expected/remote_not_origin.json b/recipes/recipe_modules/git/examples/full.expected/remote_not_origin.json
index 5853ac4c13..427935de0a 100644
--- a/recipes/recipe_modules/git/examples/full.expected/remote_not_origin.json
+++ b/recipes/recipe_modules/git/examples/full.expected/remote_not_origin.json
@@ -18,7 +18,7 @@
       "git",
       "fetch",
       "not_origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress"
     ],
diff --git a/recipes/recipe_modules/git/examples/full.expected/set_got_revision.json b/recipes/recipe_modules/git/examples/full.expected/set_got_revision.json
index b3e4a83335..05b0fd46b5 100644
--- a/recipes/recipe_modules/git/examples/full.expected/set_got_revision.json
+++ b/recipes/recipe_modules/git/examples/full.expected/set_got_revision.json
@@ -16,7 +16,7 @@
       "git",
       "fetch",
       "origin",
-      "HEAD",
+      "master",
       "--recurse-submodules",
       "--progress"
     ],