diff --git a/changelog/unreleased/PR#4383-update-org-testcontainers-testcontainers.yml b/changelog/unreleased/PR#4383-update-org-testcontainers-testcontainers.yml
new file mode 100644
index 000000000000..de10507b00ef
--- /dev/null
+++ b/changelog/unreleased/PR#4383-update-org-testcontainers-testcontainers.yml
@@ -0,0 +1,7 @@
+title: Update org.testcontainers:testcontainers to v1.21.4
+type: dependency_update
+authors:
+- name: solrbot
+links:
+- name: PR#4383
+  url: https://github.com/apache/solr/pull/4383
diff --git a/solr/licenses/docker-java-api-3.4.0.jar.sha1 b/solr/licenses/docker-java-api-3.4.0.jar.sha1
deleted file mode 100644
index bf5ca0d6db4c..000000000000
--- a/solr/licenses/docker-java-api-3.4.0.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-9ef23dcc93693f15e69b64632be096c38e31bc44
diff --git a/solr/licenses/docker-java-api-3.4.2.jar.sha1 b/solr/licenses/docker-java-api-3.4.2.jar.sha1
new file mode 100644
index 000000000000..9cefbd16ed4d
--- /dev/null
+++ b/solr/licenses/docker-java-api-3.4.2.jar.sha1
@@ -0,0 +1 @@
+90aef34aa23575de51923c83771fbe378b2eb4e5
diff --git a/solr/licenses/docker-java-transport-3.4.0.jar.sha1 b/solr/licenses/docker-java-transport-3.4.0.jar.sha1
deleted file mode 100644
index c1232d24a6be..000000000000
--- a/solr/licenses/docker-java-transport-3.4.0.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-c058705684d782effc4b2edfdef1a87544ba4af8
diff --git a/solr/licenses/docker-java-transport-3.4.2.jar.sha1 b/solr/licenses/docker-java-transport-3.4.2.jar.sha1
new file mode 100644
index 000000000000..3fb96bd9a270
--- /dev/null
+++ b/solr/licenses/docker-java-transport-3.4.2.jar.sha1
@@ -0,0 +1 @@
+e70abb944ff1fe7c25fbcdecd31c732772a07a6e
diff --git a/solr/licenses/docker-java-transport-zerodep-3.4.0.jar.sha1 b/solr/licenses/docker-java-transport-zerodep-3.4.0.jar.sha1
deleted file mode 100644
index b658f8f0810d..000000000000
--- a/solr/licenses/docker-java-transport-zerodep-3.4.0.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-c4ce6d8695cfdb0027872f99cc20f8f679f8a969
diff --git a/solr/licenses/docker-java-transport-zerodep-3.4.2.jar.sha1 b/solr/licenses/docker-java-transport-zerodep-3.4.2.jar.sha1
new file mode 100644
index 000000000000..96031aeaa52c
--- /dev/null
+++ b/solr/licenses/docker-java-transport-zerodep-3.4.2.jar.sha1
@@ -0,0 +1 @@
+784b535b8e294e699032abead0687b6773761e34
diff --git a/solr/licenses/testcontainers-1.20.4.jar.sha1 b/solr/licenses/testcontainers-1.20.4.jar.sha1
deleted file mode 100644
index 29746a98e881..000000000000
--- a/solr/licenses/testcontainers-1.20.4.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-ee2fe3afc9fa6cb2e6a43233998f3633f761692f
diff --git a/solr/licenses/testcontainers-1.21.4.jar.sha1 b/solr/licenses/testcontainers-1.21.4.jar.sha1
new file mode 100644
index 000000000000..8df2ba837f6c
--- /dev/null
+++ b/solr/licenses/testcontainers-1.21.4.jar.sha1
@@ -0,0 +1 @@
+d61745358c9ecdb8a5a124ce40c972d56a93fd60
diff --git a/versions.lock b/versions.lock
index 659611f7d411..4bda0c5ca19e 100644
--- a/versions.lock
+++ b/versions.lock
@@ -391,9 +391,9 @@ com.fasterxml.jackson.dataformat:jackson-dataformat-xml:2.18.0 (2 constraints: a
 com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.18.0 (4 constraints: 6e48dd35)
 com.fasterxml.jackson.module:jackson-module-kotlin:2.18.0 (2 constraints: aa1d6d60)
 com.fasterxml.jackson.module:jackson-module-parameter-names:2.18.0 (2 constraints: 0d248182)
-com.github.docker-java:docker-java-api:3.4.0 (1 constraints: 3b0f6067)
-com.github.docker-java:docker-java-transport:3.4.0 (1 constraints: c51513cb)
-com.github.docker-java:docker-java-transport-zerodep:3.4.0 (1 constraints: 3b0f6067)
+com.github.docker-java:docker-java-api:3.4.2 (1 constraints: 3d0f6267)
+com.github.docker-java:docker-java-transport:3.4.2 (1 constraints: c71515cb)
+com.github.docker-java:docker-java-transport-zerodep:3.4.2 (1 constraints: 3d0f6267)
 com.google.cloud:google-cloud-nio:0.127.20 (1 constraints: c90e267b)
 com.nimbusds:content-type:2.2 (1 constraints: d80b68eb)
 com.nimbusds:lang-tag:1.7 (1 constraints: dc0b6aeb)
@@ -463,7 +463,7 @@ org.springframework.boot:spring-boot-starter-jetty:2.7.13 (1 constraints: f30a39
 org.springframework.boot:spring-boot-starter-json:2.7.13 (1 constraints: d914679e)
 org.springframework.boot:spring-boot-starter-logging:2.7.13 (1 constraints: 6e138c46)
 org.springframework.boot:spring-boot-starter-web:2.7.13 (1 constraints: f30a39d6)
-org.testcontainers:testcontainers:1.20.4 (1 constraints: 3905313b)
+org.testcontainers:testcontainers:1.21.4 (1 constraints: 3a05343b)
 org.yaml:snakeyaml:1.30 (1 constraints: 0713d91f)
 software.amazon.awssdk:url-connection-client:2.42.37 (2 constraints: 461f04f7)
 software.amazon.ion:ion-java:1.0.2 (1 constraints: 720db831)
diff --git a/versions.props b/versions.props
index 9696656c75ea..1ad02d7c1ba4 100644
--- a/versions.props
+++ b/versions.props
@@ -83,6 +83,6 @@ org.osgi:osgi.annotation=8.1.0
 org.quicktheories:quicktheories=0.26
 org.semver4j:semver4j=5.8.0
 org.slf4j:*=2.0.17
-org.testcontainers:testcontainers*=1.20.4
+org.testcontainers:testcontainers*=1.21.4
 org.xerial.snappy:snappy-java=1.1.10.8
 software.amazon.awssdk:*=2.42.37