diff --git a/django/db/backends/oracle/operations.py b/django/db/backends/oracle/operations.py
index 2d3df92411..d7f6c70c18 100644
--- a/django/db/backends/oracle/operations.py
+++ b/django/db/backends/oracle/operations.py
@@ -89,12 +89,12 @@ END;
         elif lookup_type == "iso_year":
             return "TO_CHAR(%s, 'IYYY')" % field_name
         else:
-            # https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf/EXTRACT-datetime.html
+            # https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/EXTRACT-datetime.html
             return "EXTRACT(%s FROM %s)" % (lookup_type.upper(), field_name)
 
     def date_trunc_sql(self, lookup_type, field_name, tzname=None):
         field_name = self._convert_field_to_tz(field_name, tzname)
-        # https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf/ROUND-and-TRUNC-Date-Functions.html
+        # https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/ROUND-and-TRUNC-Date-Functions.html
         if lookup_type in ("year", "month"):
             return "TRUNC(%s, '%s')" % (field_name, lookup_type.upper())
         elif lookup_type == "quarter":
@@ -152,7 +152,7 @@ END;
 
     def datetime_trunc_sql(self, lookup_type, field_name, tzname):
         field_name = self._convert_field_to_tz(field_name, tzname)
-        # https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf/ROUND-and-TRUNC-Date-Functions.html
+        # https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/ROUND-and-TRUNC-Date-Functions.html
         if lookup_type in ("year", "month"):
             sql = "TRUNC(%s, '%s')" % (field_name, lookup_type.upper())
         elif lookup_type == "quarter":
diff --git a/django/db/backends/oracle/schema.py b/django/db/backends/oracle/schema.py
index 0eb0f6f668..e4178ec10b 100644
--- a/django/db/backends/oracle/schema.py
+++ b/django/db/backends/oracle/schema.py
@@ -114,7 +114,7 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
         # Add it
         self.add_field(model, new_temp_field)
         # Explicit data type conversion
-        # https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf
+        # https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf
         # /Data-Type-Comparison-Rules.html#GUID-D0C5A47E-6F93-4C2D-9E49-4F2B86B359DD
         new_value = self.quote_name(old_field.column)
         old_type = old_field.db_type(self.connection)
diff --git a/docs/ref/contrib/gis/functions.txt b/docs/ref/contrib/gis/functions.txt
index 82aaf1196d..a7dae25f97 100644
--- a/docs/ref/contrib/gis/functions.txt
+++ b/docs/ref/contrib/gis/functions.txt
@@ -221,7 +221,7 @@ south = ``π``; west = ``3π/2``.
 .. class:: BoundingCircle(expression, num_seg=48, **extra)
 
 *Availability*: `PostGIS <https://postgis.net/docs/ST_MinimumBoundingCircle.html>`__,
-`Oracle <https://docs.oracle.com/en/database/oracle/oracle-database/18/spatl/
+`Oracle <https://docs.oracle.com/en/database/oracle/oracle-database/21/spatl/
 SDO_GEOM-reference.html#GUID-82A61626-BB64-4793-B53D-A0DBEC91831A>`_
 
 Accepts a single geographic field or expression and returns the smallest circle
@@ -307,8 +307,8 @@ queryset is calculated::
 
 *Availability*: MariaDB, `MySQL
 <https://dev.mysql.com/doc/refman/en/gis-general-property-functions.html#function_st-envelope>`__,
-`Oracle <https://docs.oracle.com/en/database/oracle/oracle-database/18/spatl/
-SDO_GEOM-reference.html#GUID-646638D0-2C5F-490A-AF63-DE9B7A4C97C1__CHDJCEIH>`__,
+`Oracle <https://docs.oracle.com/en/database/oracle/oracle-database/21/spatl/
+spatial-operators-reference.html#GUID-ACED800F-3435-44AA-9606-D40934A23ED0>`__,
 `PostGIS <https://postgis.net/docs/ST_Envelope.html>`__, SpatiaLite
 
 Accepts a single geographic field or expression and returns the geometry
diff --git a/docs/ref/contrib/gis/geoquerysets.txt b/docs/ref/contrib/gis/geoquerysets.txt
index 7aa5c94681..dac663e3b8 100644
--- a/docs/ref/contrib/gis/geoquerysets.txt
+++ b/docs/ref/contrib/gis/geoquerysets.txt
@@ -838,7 +838,7 @@ Keyword Argument       Description
                        details.
 =====================  =====================================================
 
-__ https://docs.oracle.com/en/database/oracle/oracle-database/18/spatl/
+__ https://docs.oracle.com/en/database/oracle/oracle-database/21/spatl/
    spatial-concepts.html#GUID-CE10AB14-D5EA-43BA-A647-DAC9EEF41EE6
 
 Example::
diff --git a/docs/ref/unicode.txt b/docs/ref/unicode.txt
index cf0f9d3e0e..57e08f6482 100644
--- a/docs/ref/unicode.txt
+++ b/docs/ref/unicode.txt
@@ -29,9 +29,9 @@ able to store certain characters in the database, and information will be lost.
 
 .. _MySQL manual: https://dev.mysql.com/doc/refman/en/charset-database.html
 .. _PostgreSQL manual: https://www.postgresql.org/docs/current/multibyte.html#id-1.6.11.5.6
-.. _Oracle manual: https://docs.oracle.com/en/database/oracle/oracle-database/18/nlspg/index.html
-.. _section 2: https://docs.oracle.com/en/database/oracle/oracle-database/18/nlspg/choosing-character-set.html
-.. _section 11: https://docs.oracle.com/en/database/oracle/oracle-database/18/nlspg/character-set-migration.html
+.. _Oracle manual: https://docs.oracle.com/en/database/oracle/oracle-database/21/nlspg/index.html
+.. _section 2: https://docs.oracle.com/en/database/oracle/oracle-database/21/nlspg/choosing-character-set.html
+.. _section 11: https://docs.oracle.com/en/database/oracle/oracle-database/21/nlspg/character-set-migration.html
 
 All of Django's database backends automatically convert strings into
 the appropriate encoding for talking to the database. They also automatically
diff --git a/docs/releases/2.0.txt b/docs/releases/2.0.txt
index c3730a794b..6501620ecf 100644
--- a/docs/releases/2.0.txt
+++ b/docs/releases/2.0.txt
@@ -237,7 +237,7 @@ Models
   finds the starting index of a string inside another string.
 
 * On Oracle, ``AutoField`` and ``BigAutoField`` are now created as `identity
-  columns <https://docs.oracle.com/en/database/oracle/oracle-database/18/drdaa/
+  columns <https://docs.oracle.com/en/database/oracle/oracle-database/21/drdaa/
   intro-to-tools-and-products-supporting-migraiton.html#GUID-14E4817B-F3BC-4D99
   -B471-A0ACDC303CC9>`__.