diff --git a/.pick_status.json b/.pick_status.json
index 5ae48edbabe..c7650c79db6 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -5,7 +5,7 @@
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-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14036,7 +14036,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14045,7 +14045,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14054,7 +14054,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14063,7 +14063,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14072,7 +14072,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14081,7 +14081,7 @@
         "nominated": true,
         "nomination_type": 1,
         "resolution": 1,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": "6d4f33e469b301b2fc4f398f62c81ef66f9150be"
     },
     {
@@ -14090,7 +14090,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14099,7 +14099,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14108,7 +14108,7 @@
         "nominated": true,
         "nomination_type": 1,
         "resolution": 1,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": "adf1659ff5f07d907eca552be3b566e408c8601e"
     },
     {
@@ -14117,7 +14117,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14126,7 +14126,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 1,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14135,7 +14135,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14144,7 +14144,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14153,7 +14153,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14162,7 +14162,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14171,7 +14171,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14180,7 +14180,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14189,7 +14189,7 @@
         "nominated": true,
         "nomination_type": 0,
         "resolution": 1,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14198,7 +14198,7 @@
         "nominated": true,
         "nomination_type": 1,
         "resolution": 1,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": "86644b84b94910ddb78b7a1117b8bcf55bb76265"
     },
     {
@@ -14207,7 +14207,7 @@
         "nominated": true,
         "nomination_type": 1,
         "resolution": 1,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": "86644b84b94910ddb78b7a1117b8bcf55bb76265"
     },
     {
@@ -14216,7 +14216,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14225,7 +14225,7 @@
         "nominated": false,
         "nomination_type": 1,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": "002304482ceeb4812607e5ed8ee6bb0e1fe7747e"
     },
     {
@@ -14234,7 +14234,7 @@
         "nominated": true,
         "nomination_type": 1,
         "resolution": 1,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": "cbd299b051a7a6a7192a9d87ee0a1afbbaf1d0cc"
     },
     {
@@ -14243,7 +14243,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14252,7 +14252,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14261,7 +14261,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14270,7 +14270,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14279,7 +14279,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14288,7 +14288,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14297,7 +14297,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14306,7 +14306,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14315,7 +14315,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14324,7 +14324,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14333,7 +14333,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14342,7 +14342,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14351,7 +14351,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14360,7 +14360,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14369,7 +14369,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14378,7 +14378,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14387,7 +14387,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14396,7 +14396,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14405,7 +14405,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14414,7 +14414,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14423,7 +14423,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14432,7 +14432,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14441,7 +14441,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14450,7 +14450,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14459,7 +14459,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14468,7 +14468,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14477,7 +14477,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14486,7 +14486,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14495,7 +14495,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14504,7 +14504,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14513,7 +14513,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14522,7 +14522,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14531,7 +14531,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14540,7 +14540,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14549,7 +14549,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14558,7 +14558,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14567,7 +14567,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14576,7 +14576,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14585,7 +14585,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14594,7 +14594,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14603,7 +14603,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14612,7 +14612,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14621,7 +14621,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14630,7 +14630,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14639,7 +14639,7 @@
         "nominated": true,
         "nomination_type": 1,
         "resolution": 1,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": "44217be92134b03e7426860b42918b1d4602e08e"
     },
     {
@@ -14648,7 +14648,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14657,7 +14657,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14666,7 +14666,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14675,7 +14675,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14684,7 +14684,7 @@
         "nominated": false,
         "nomination_type": null,
         "resolution": 4,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": null
     },
     {
@@ -14693,7 +14693,7 @@
         "nominated": true,
         "nomination_type": 1,
         "resolution": 1,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": "7c64623e9489a37297808f7346e6e80bd1c78587"
     },
     {
@@ -14702,7 +14702,7 @@
         "nominated": true,
         "nomination_type": 1,
         "resolution": 1,
-        "master_sha": null,
+        "main_sha": null,
         "because_sha": "7c64623e9489a37297808f7346e6e80bd1c78587"
     }
 ]
\ No newline at end of file
diff --git a/bin/pick/core.py b/bin/pick/core.py
index cc0b00f4d40..de5d0715cee 100644
--- a/bin/pick/core.py
+++ b/bin/pick/core.py
@@ -42,7 +42,7 @@ if typing.TYPE_CHECKING:
         nominated: bool
         nomination_type: typing.Optional[int]
         resolution: typing.Optional[int]
-        master_sha: typing.Optional[str]
+        main_sha: typing.Optional[str]
         because_sha: typing.Optional[str]
 
 IS_FIX = re.compile(r'^\s*fixes:\s*([a-f0-9]{6,40})', flags=re.MULTILINE | re.IGNORECASE)
@@ -118,7 +118,7 @@ class Commit:
     nominated: bool = attr.ib(False)
     nomination_type: typing.Optional[NominationType] = attr.ib(None)
     resolution: Resolution = attr.ib(Resolution.UNRESOLVED)
-    master_sha: typing.Optional[str] = attr.ib(None)
+    main_sha: typing.Optional[str] = attr.ib(None)
     because_sha: typing.Optional[str] = attr.ib(None)
 
     def to_json(self) -> 'CommitDict':
@@ -131,7 +131,7 @@ class Commit:
 
     @classmethod
     def from_json(cls, data: 'CommitDict') -> 'Commit':
-        c = cls(data['sha'], data['description'], data['nominated'], master_sha=data['master_sha'], because_sha=data['because_sha'])
+        c = cls(data['sha'], data['description'], data['nominated'], main_sha=data['main_sha'], because_sha=data['because_sha'])
         if data['nomination_type'] is not None:
             c.nomination_type = NominationType(data['nomination_type'])
         if data['resolution'] is not None:
diff --git a/bin/pick/core_test.py b/bin/pick/core_test.py
index 6ac186801ab..a7d14d04d24 100644
--- a/bin/pick/core_test.py
+++ b/bin/pick/core_test.py
@@ -34,7 +34,7 @@ class TestCommit:
 
     @pytest.fixture
     def unnominated_commit(self) -> 'core.Commit':
-        return core.Commit('abc123', 'sub: A commit', master_sha='45678')
+        return core.Commit('abc123', 'sub: A commit', main_sha='45678')
 
     @pytest.fixture
     def nominated_commit(self) -> 'core.Commit':
@@ -48,7 +48,7 @@ class TestCommit:
             v = c.to_json()
             assert v == {'sha': 'abc123', 'description': 'sub: A commit', 'nominated': False,
                          'nomination_type': None, 'resolution': core.Resolution.UNRESOLVED.value,
-                         'master_sha': '45678', 'because_sha': None}
+                         'main_sha': '45678', 'because_sha': None}
 
         def test_nominated(self, nominated_commit: 'core.Commit'):
             c = nominated_commit
@@ -58,7 +58,7 @@ class TestCommit:
                          'nominated': True,
                          'nomination_type': core.NominationType.CC.value,
                          'resolution': core.Resolution.UNRESOLVED.value,
-                         'master_sha': None,
+                         'main_sha': None,
                          'because_sha': None}
 
     class TestFromJson: