diff --git a/changelog/unreleased/PR#4384-update-net-bytebuddy-to-v1-18-8-jdk5-branch-9x.yml b/changelog/unreleased/PR#4384-update-net-bytebuddy-to-v1-18-8-jdk5-branch-9x.yml
new file mode 100644
index 000000000000..d7e59b5d7402
--- /dev/null
+++ b/changelog/unreleased/PR#4384-update-net-bytebuddy-to-v1-18-8-jdk5-branch-9x.yml
@@ -0,0 +1,7 @@
+title: Update net.bytebuddy:* to v1.18.8-jdk5 (branch_9x)
+type: dependency_update
+authors:
+- name: solrbot
+links:
+- name: PR#4384
+  url: https://github.com/apache/solr/pull/4384
diff --git a/solr/licenses/byte-buddy-1.17.7.jar.sha1 b/solr/licenses/byte-buddy-1.17.7.jar.sha1
deleted file mode 100644
index 1104b3c9420d..000000000000
--- a/solr/licenses/byte-buddy-1.17.7.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-3856bfab61beb23e099a0d6629f2ba8de4b98ace
diff --git a/solr/licenses/byte-buddy-1.18.8-jdk5.jar.sha1 b/solr/licenses/byte-buddy-1.18.8-jdk5.jar.sha1
new file mode 100644
index 000000000000..3eeb169fa495
--- /dev/null
+++ b/solr/licenses/byte-buddy-1.18.8-jdk5.jar.sha1
@@ -0,0 +1 @@
+d8ea191a3c22dec50640db3a625a3c8402b262e3
diff --git a/solr/licenses/byte-buddy-agent-1.17.7.jar.sha1 b/solr/licenses/byte-buddy-agent-1.17.7.jar.sha1
deleted file mode 100644
index 1074f60f1bf8..000000000000
--- a/solr/licenses/byte-buddy-agent-1.17.7.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-fbf3d6d649ed37fc9e9c59480a05be0a26e3c2da
diff --git a/solr/licenses/byte-buddy-agent-1.18.8-jdk5.jar.sha1 b/solr/licenses/byte-buddy-agent-1.18.8-jdk5.jar.sha1
new file mode 100644
index 000000000000..ab589f1aaa35
--- /dev/null
+++ b/solr/licenses/byte-buddy-agent-1.18.8-jdk5.jar.sha1
@@ -0,0 +1 @@
+903b4cd6426ef0d68f781eefd298ca6d3542141b
diff --git a/versions.lock b/versions.lock
index 659611f7d411..5d48c19db84e 100644
--- a/versions.lock
+++ b/versions.lock
@@ -411,8 +411,8 @@ jakarta.websocket:jakarta.websocket-api:1.1.2 (1 constraints: 92155ab9)
 jakarta.xml.bind:jakarta.xml.bind-api:2.3.3 (1 constraints: bd0db535)
 javax.inject:javax.inject:1 (1 constraints: 7a0df617)
 joda-time:joda-time:2.8.1 (1 constraints: 7a0dd431)
-net.bytebuddy:byte-buddy:1.17.7 (2 constraints: 8b1044cc)
-net.bytebuddy:byte-buddy-agent:1.17.7 (1 constraints: 4205453b)
+net.bytebuddy:byte-buddy:1.18.8-jdk5 (2 constraints: 28124522)
+net.bytebuddy:byte-buddy-agent:1.18.8-jdk5 (1 constraints: df065d5a)
 net.java.dev.jna:jna:5.18.1 (2 constraints: 371b0b62)
 net.minidev:accessors-smart:2.4.9 (1 constraints: 500a92b8)
 net.minidev:json-smart:2.4.10 (1 constraints: 400e9a7c)
diff --git a/versions.props b/versions.props
index 9696656c75ea..9e9e0c60314c 100644
--- a/versions.props
+++ b/versions.props
@@ -36,7 +36,7 @@ io.prometheus:simpleclient*=0.16.0
 io.swagger.core.v3:*=2.2.22
 jakarta.ws.rs:jakarta.ws.rs-api=3.1.0
 junit:junit=4.13.2
-net.bytebuddy:*=1.17.7
+net.bytebuddy:*=1.18.8-jdk5
 net.java.dev.jna:jna=5.18.1
 net.thisptr:jackson-jq=0.0.13
 no.nav.security:mock-oauth2-server=0.5.10