diff --git a/oauth2-authorization-server/src/main/java/org/springframework/security/oauth2/core/OAuth2TokenIntrospectionClaimAccessor.java b/oauth2-authorization-server/src/main/java/org/springframework/security/oauth2/core/OAuth2TokenIntrospectionClaimAccessor.java
deleted file mode 100644
index c48f3144..00000000
--- a/oauth2-authorization-server/src/main/java/org/springframework/security/oauth2/core/OAuth2TokenIntrospectionClaimAccessor.java
+++ /dev/null
@@ -1,150 +0,0 @@
-/*
- * Copyright 2002-2020 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.security.oauth2.core;
-
-import java.net.URL;
-import java.time.Instant;
-import java.util.List;
-
-/*
- * TODO
- * This class is "mostly" a copy from Spring Security and should be removed after upgrading to Spring Security 5.6.0 GA.
- * The major changes made between the Spring Security class and this one are:
- * 1) Class renamed from `OAuth2IntrospectionClaimAccessor` to `OAuth2TokenIntrospectionClaimAccessor`
- * 2) Moved from package `org.springframework.security.oauth2.server.resource.introspection` to `org.springframework.security.oauth2.core`
- *
- * gh-9647 Move and rename OAuth2IntrospectionClaimAccessor/Names
- * https://github.com/spring-projects/spring-security/issues/9647
- */
-
-/**
- * A {@link ClaimAccessor} for the "claims" that may be contained in the
- * Introspection Response.
- *
- * @author David Kovac
- * @since 5.4
- * @see ClaimAccessor
- * @see OAuth2TokenIntrospectionClaimNames
- * @see Introspection Response
- * @deprecated See gh-597
- */
-@Deprecated
-public interface OAuth2TokenIntrospectionClaimAccessor extends ClaimAccessor {
-
- /**
- * Returns the indicator {@code (active)} whether or not the token is currently active
- * @return the indicator whether or not the token is currently active
- */
- default boolean isActive() {
- return Boolean.TRUE.equals(getClaimAsBoolean(OAuth2TokenIntrospectionClaimNames.ACTIVE));
- }
-
- /**
- * Returns the scopes {@code (scope)} associated with the token
- * @return the scopes associated with the token
- */
- default List getScopes() {
- return getClaimAsStringList(OAuth2TokenIntrospectionClaimNames.SCOPE);
- }
-
- /**
- * Returns the client identifier {@code (client_id)} for the token
- * @return the client identifier for the token
- */
- default String getClientId() {
- return getClaimAsString(OAuth2TokenIntrospectionClaimNames.CLIENT_ID);
- }
-
- /**
- * Returns a human-readable identifier {@code (username)} for the resource owner that
- * authorized the token
- * @return a human-readable identifier for the resource owner that authorized the
- * token
- */
- default String getUsername() {
- return getClaimAsString(OAuth2TokenIntrospectionClaimNames.USERNAME);
- }
-
- /**
- * Returns the type of the token {@code (token_type)}, for example {@code bearer}.
- * @return the type of the token, for example {@code bearer}.
- */
- default String getTokenType() {
- return getClaimAsString(OAuth2TokenIntrospectionClaimNames.TOKEN_TYPE);
- }
-
- /**
- * Returns a timestamp {@code (exp)} indicating when the token expires
- * @return a timestamp indicating when the token expires
- */
- default Instant getExpiresAt() {
- return getClaimAsInstant(OAuth2TokenIntrospectionClaimNames.EXP);
- }
-
- /**
- * Returns a timestamp {@code (iat)} indicating when the token was issued
- * @return a timestamp indicating when the token was issued
- */
- default Instant getIssuedAt() {
- return getClaimAsInstant(OAuth2TokenIntrospectionClaimNames.IAT);
- }
-
- /**
- * Returns a timestamp {@code (nbf)} indicating when the token is not to be used
- * before
- * @return a timestamp indicating when the token is not to be used before
- */
- default Instant getNotBefore() {
- return getClaimAsInstant(OAuth2TokenIntrospectionClaimNames.NBF);
- }
-
- /**
- * Returns usually a machine-readable identifier {@code (sub)} of the resource owner
- * who authorized the token
- * @return usually a machine-readable identifier of the resource owner who authorized
- * the token
- */
- default String getSubject() {
- return getClaimAsString(OAuth2TokenIntrospectionClaimNames.SUB);
- }
-
- /**
- * Returns the intended audience {@code (aud)} for the token
- * @return the intended audience for the token
- */
- default List getAudience() {
- return getClaimAsStringList(OAuth2TokenIntrospectionClaimNames.AUD);
- }
-
- /**
- * Returns the issuer {@code (iss)} of the token
- * @return the issuer of the token
- */
- default URL getIssuer() {
- return getClaimAsURL(OAuth2TokenIntrospectionClaimNames.ISS);
- }
-
- /**
- * Returns the identifier {@code (jti)} for the token
- * @return the identifier for the token
- */
- default String getId() {
- return getClaimAsString(OAuth2TokenIntrospectionClaimNames.JTI);
- }
-
-}
diff --git a/oauth2-authorization-server/src/main/java/org/springframework/security/oauth2/core/OAuth2TokenIntrospectionClaimNames.java b/oauth2-authorization-server/src/main/java/org/springframework/security/oauth2/core/OAuth2TokenIntrospectionClaimNames.java
deleted file mode 100644
index 09e8a41e..00000000
--- a/oauth2-authorization-server/src/main/java/org/springframework/security/oauth2/core/OAuth2TokenIntrospectionClaimNames.java
+++ /dev/null
@@ -1,104 +0,0 @@
-/*
- * Copyright 2002-2019 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.security.oauth2.core;
-
-/*
- * TODO
- * This class is "mostly" a copy from Spring Security and should be removed after upgrading to Spring Security 5.6.0 GA.
- * The major changes made between the Spring Security class and this one are:
- * 1) Class renamed from `OAuth2IntrospectionClaimNames` to `OAuth2TokenIntrospectionClaimNames`
- * 2) Moved from package `org.springframework.security.oauth2.server.resource.introspection` to `org.springframework.security.oauth2.core`
- *
- * gh-9647 Move and rename OAuth2IntrospectionClaimAccessor/Names
- * https://github.com/spring-projects/spring-security/issues/9647
- */
-
-/**
- * The names of the "Introspection Claims" defined by an
- * Introspection
- * Response.
- *
- * @author Josh Cummings
- * @since 5.2
- * @deprecated See gh-597
- */
-@Deprecated
-public interface OAuth2TokenIntrospectionClaimNames {
-
- /**
- * {@code active} - Indicator whether or not the token is currently active
- */
- String ACTIVE = "active";
-
- /**
- * {@code scope} - The scopes for the token
- */
- String SCOPE = "scope";
-
- /**
- * {@code client_id} - The Client identifier for the token
- */
- String CLIENT_ID = "client_id";
-
- /**
- * {@code username} - A human-readable identifier for the resource owner that
- * authorized the token
- */
- String USERNAME = "username";
-
- /**
- * {@code token_type} - The type of the token, for example {@code bearer}.
- */
- String TOKEN_TYPE = "token_type";
-
- /**
- * {@code exp} - A timestamp indicating when the token expires
- */
- String EXP = "exp";
-
- /**
- * {@code iat} - A timestamp indicating when the token was issued
- */
- String IAT = "iat";
-
- /**
- * {@code nbf} - A timestamp indicating when the token is not to be used before
- */
- String NBF = "nbf";
-
- /**
- * {@code sub} - Usually a machine-readable identifier of the resource owner who
- * authorized the token
- */
- String SUB = "sub";
-
- /**
- * {@code aud} - The intended audience for the token
- */
- String AUD = "aud";
-
- /**
- * {@code iss} - The issuer of the token
- */
- String ISS = "iss";
-
- /**
- * {@code jti} - The identifier for the token
- */
- String JTI = "jti";
-
-}