diff --git a/django/db/backends/postgresql/schema.py b/django/db/backends/postgresql/schema.py
index 842830be3040..0c8548a5d663 100644
--- a/django/db/backends/postgresql/schema.py
+++ b/django/db/backends/postgresql/schema.py
@@ -255,25 +255,6 @@ def _alter_column_type_sql(
                 model, old_field, new_field, new_type, old_collation, new_collation
             )
 
-    def _alter_column_collation_sql(
-        self, model, new_field, new_type, new_collation, old_field
-    ):
-        sql = self.sql_alter_column_collate
-        # Cast when data type changed.
-        if using_sql := self._using_sql(new_field, old_field):
-            sql += using_sql
-        return (
-            sql
-            % {
-                "column": self.quote_name(new_field.column),
-                "type": new_type,
-                "collation": (
-                    " " + self._collate_sql(new_collation) if new_collation else ""
-                ),
-            },
-            [],
-        )
-
     def _alter_field(
         self,
         model,