diff --git a/static/arguments.json b/static/arguments.json
index 4e8cb62588..b41423ce96 100644
--- a/static/arguments.json
+++ b/static/arguments.json
@@ -3034,7 +3034,7 @@
         "name": "size",
         "type": "Integer",
         "default": "`20`",
-        "description": "One of `16`, `20`, `24`, `32`, `40`, `48`, or `80`."
+        "description": "One of `16`, `20`, `24`, `32`, `40`, `48`, `64`, or `80`."
       },
       {
         "name": "shape",
diff --git a/static/constants.json b/static/constants.json
index 03c803dce4..74c8ba86d7 100644
--- a/static/constants.json
+++ b/static/constants.json
@@ -709,6 +709,7 @@
       32,
       40,
       48,
+      64,
       80
     ],
     "SMALL_THRESHOLD": 24
diff --git a/static/info_arch.json b/static/info_arch.json
index ce5cbd0e0f..5b7680b263 100644
--- a/static/info_arch.json
+++ b/static/info_arch.json
@@ -9258,7 +9258,7 @@
         "name": "size",
         "type": "Integer",
         "default": "`20`",
-        "description": "One of `16`, `20`, `24`, `32`, `40`, `48`, or `80`."
+        "description": "One of `16`, `20`, `24`, `32`, `40`, `48`, `64`, or `80`."
       },
       {
         "name": "shape",
@@ -9403,6 +9403,19 @@
           ]
         }
       },
+      {
+        "preview_path": "primer/beta/avatar/size_64",
+        "name": "size_64",
+        "snapshot": "true",
+        "skip_rules": {
+          "wont_fix": [
+            "region"
+          ],
+          "will_fix": [
+            "color-contrast"
+          ]
+        }
+      },
       {
         "preview_path": "primer/beta/avatar/size_80",
         "name": "size_80",
diff --git a/static/previews.json b/static/previews.json
index f699a8f082..1d02ff2452 100644
--- a/static/previews.json
+++ b/static/previews.json
@@ -1176,6 +1176,19 @@
           ]
         }
       },
+      {
+        "preview_path": "primer/beta/avatar/size_64",
+        "name": "size_64",
+        "snapshot": "true",
+        "skip_rules": {
+          "wont_fix": [
+            "region"
+          ],
+          "will_fix": [
+            "color-contrast"
+          ]
+        }
+      },
       {
         "preview_path": "primer/beta/avatar/size_80",
         "name": "size_80",