diff --git a/buildSrc/version.properties b/buildSrc/version.properties
index d3dbae38c2615..4ff8609a495fa 100644
--- a/buildSrc/version.properties
+++ b/buildSrc/version.properties
@@ -48,7 +48,7 @@ reactivestreams   = 1.0.4
 # when updating this version, you need to ensure compatibility with:
 #  - plugins/ingest-attachment (transitive dependency, check the upstream POM)
 #  - distribution/tools/plugin-cli
-bouncycastle=1.70
+bouncycastle=1.75
 # test dependencies
 randomizedrunner  = 2.7.1
 junit             = 4.13.2
diff --git a/plugins/identity-shiro/build.gradle b/plugins/identity-shiro/build.gradle
index 22dc21864b620..5be590fdda983 100644
--- a/plugins/identity-shiro/build.gradle
+++ b/plugins/identity-shiro/build.gradle
@@ -28,7 +28,7 @@ dependencies {
 
   implementation 'org.passay:passay:1.6.3'
 
-  implementation "org.bouncycastle:bcprov-jdk15on:${versions.bouncycastle}"
+  implementation "org.bouncycastle:bcprov-jdk18on:${versions.bouncycastle}"
 
   testImplementation project(path: ':modules:transport-netty4') // for http
   testImplementation project(path: ':plugins:transport-nio') // for http
diff --git a/plugins/identity-shiro/licenses/bcprov-jdk15on-1.70.jar.sha1 b/plugins/identity-shiro/licenses/bcprov-jdk15on-1.70.jar.sha1
deleted file mode 100644
index f5e89c0f5ed45..0000000000000
--- a/plugins/identity-shiro/licenses/bcprov-jdk15on-1.70.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-4636a0d01f74acaf28082fb62b317f1080118371
\ No newline at end of file
diff --git a/plugins/ingest-attachment/build.gradle b/plugins/ingest-attachment/build.gradle
index 1f3c80909733c..950e37c64dd2c 100644
--- a/plugins/ingest-attachment/build.gradle
+++ b/plugins/ingest-attachment/build.gradle
@@ -71,9 +71,9 @@ dependencies {
   api "org.apache.pdfbox:fontbox:${versions.pdfbox}"
   api "org.apache.pdfbox:jempbox:1.8.17"
   api "commons-logging:commons-logging:${versions.commonslogging}"
-  api "org.bouncycastle:bcmail-jdk15on:${versions.bouncycastle}"
-  api "org.bouncycastle:bcprov-jdk15on:${versions.bouncycastle}"
-  api "org.bouncycastle:bcpkix-jdk15on:${versions.bouncycastle}"
+  api "org.bouncycastle:bcmail-jdk18on:${versions.bouncycastle}"
+  api "org.bouncycastle:bcprov-jdk18on:${versions.bouncycastle}"
+  api "org.bouncycastle:bcpkix-jdk18on:${versions.bouncycastle}"
   // OpenOffice
   api "org.apache.poi:poi-ooxml:${versions.poi}"
   api "org.apache.poi:poi:${versions.poi}"
diff --git a/plugins/ingest-attachment/licenses/bcmail-jdk15on-1.70.jar.sha1 b/plugins/ingest-attachment/licenses/bcmail-jdk15on-1.70.jar.sha1
deleted file mode 100644
index 672e479eda8d7..0000000000000
--- a/plugins/ingest-attachment/licenses/bcmail-jdk15on-1.70.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-08f4aafad90f6cc7f16b9992279828ae848c9e0d
\ No newline at end of file
diff --git a/plugins/ingest-attachment/licenses/bcmail-jdk18on-1.75.jar.sha1 b/plugins/ingest-attachment/licenses/bcmail-jdk18on-1.75.jar.sha1
new file mode 100644
index 0000000000000..d0660290c8f37
--- /dev/null
+++ b/plugins/ingest-attachment/licenses/bcmail-jdk18on-1.75.jar.sha1
@@ -0,0 +1 @@
+37914b6a6ea3cad9a20ef8b37ea10de7260b8e92
\ No newline at end of file
diff --git a/plugins/ingest-attachment/licenses/bcmail-jdk15on-LICENSE.txt b/plugins/ingest-attachment/licenses/bcmail-jdk18on-LICENSE.txt
similarity index 100%
rename from plugins/ingest-attachment/licenses/bcmail-jdk15on-LICENSE.txt
rename to plugins/ingest-attachment/licenses/bcmail-jdk18on-LICENSE.txt
diff --git a/plugins/ingest-attachment/licenses/bcmail-jdk15on-NOTICE.txt b/plugins/ingest-attachment/licenses/bcmail-jdk18on-NOTICE.txt
similarity index 100%
rename from plugins/ingest-attachment/licenses/bcmail-jdk15on-NOTICE.txt
rename to plugins/ingest-attachment/licenses/bcmail-jdk18on-NOTICE.txt
diff --git a/plugins/ingest-attachment/licenses/bcpkix-jdk15on-1.70.jar.sha1 b/plugins/ingest-attachment/licenses/bcpkix-jdk15on-1.70.jar.sha1
deleted file mode 100644
index e348463a21257..0000000000000
--- a/plugins/ingest-attachment/licenses/bcpkix-jdk15on-1.70.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-f81e5af49571a9d5a109a88f239a73ce87055417
\ No newline at end of file
diff --git a/plugins/ingest-attachment/licenses/bcpkix-jdk18on-1.75.jar.sha1 b/plugins/ingest-attachment/licenses/bcpkix-jdk18on-1.75.jar.sha1
new file mode 100644
index 0000000000000..d8ba05d5f3c5a
--- /dev/null
+++ b/plugins/ingest-attachment/licenses/bcpkix-jdk18on-1.75.jar.sha1
@@ -0,0 +1 @@
+5adfef8a71a0933454739264b56283cc73dd2383
\ No newline at end of file
diff --git a/plugins/ingest-attachment/licenses/bcpkix-jdk15on-LICENSE.txt b/plugins/ingest-attachment/licenses/bcpkix-jdk18on-LICENSE.txt
similarity index 100%
rename from plugins/ingest-attachment/licenses/bcpkix-jdk15on-LICENSE.txt
rename to plugins/ingest-attachment/licenses/bcpkix-jdk18on-LICENSE.txt
diff --git a/plugins/ingest-attachment/licenses/bcpkix-jdk15on-NOTICE.txt b/plugins/ingest-attachment/licenses/bcpkix-jdk18on-NOTICE.txt
similarity index 100%
rename from plugins/ingest-attachment/licenses/bcpkix-jdk15on-NOTICE.txt
rename to plugins/ingest-attachment/licenses/bcpkix-jdk18on-NOTICE.txt
diff --git a/plugins/ingest-attachment/licenses/bcprov-jdk15on-1.70.jar.sha1 b/plugins/ingest-attachment/licenses/bcprov-jdk15on-1.70.jar.sha1
deleted file mode 100644
index f5e89c0f5ed45..0000000000000
--- a/plugins/ingest-attachment/licenses/bcprov-jdk15on-1.70.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-4636a0d01f74acaf28082fb62b317f1080118371
\ No newline at end of file
diff --git a/plugins/ingest-attachment/licenses/bcprov-jdk18on-1.75.jar.sha1 b/plugins/ingest-attachment/licenses/bcprov-jdk18on-1.75.jar.sha1
new file mode 100644
index 0000000000000..7ad5b12c0abe7
--- /dev/null
+++ b/plugins/ingest-attachment/licenses/bcprov-jdk18on-1.75.jar.sha1
@@ -0,0 +1 @@
+fd9638f6468e934991c56242d0da2ae38890c2a4
\ No newline at end of file
diff --git a/plugins/ingest-attachment/licenses/bcprov-jdk15on-LICENSE.txt b/plugins/ingest-attachment/licenses/bcprov-jdk18on-LICENSE.txt
similarity index 100%
rename from plugins/ingest-attachment/licenses/bcprov-jdk15on-LICENSE.txt
rename to plugins/ingest-attachment/licenses/bcprov-jdk18on-LICENSE.txt
diff --git a/plugins/ingest-attachment/licenses/bcprov-jdk15on-NOTICE.txt b/plugins/ingest-attachment/licenses/bcprov-jdk18on-NOTICE.txt
similarity index 100%
rename from plugins/ingest-attachment/licenses/bcprov-jdk15on-NOTICE.txt
rename to plugins/ingest-attachment/licenses/bcprov-jdk18on-NOTICE.txt
diff --git a/test/fixtures/hdfs-fixture/build.gradle b/test/fixtures/hdfs-fixture/build.gradle
index 70b84a405c9c6..0ac2e9e92230f 100644
--- a/test/fixtures/hdfs-fixture/build.gradle
+++ b/test/fixtures/hdfs-fixture/build.gradle
@@ -51,7 +51,7 @@ dependencies {
   api "org.apache.logging.log4j:log4j-core:${versions.log4j}"
   api "io.netty:netty-all:${versions.netty}"
   api 'com.google.code.gson:gson:2.10.1'
-  api "org.bouncycastle:bcpkix-jdk15on:${versions.bouncycastle}"
+  api "org.bouncycastle:bcpkix-jdk18on:${versions.bouncycastle}"
   api "com.fasterxml.jackson.jaxrs:jackson-jaxrs-json-provider:${versions.jackson}"
   api "com.fasterxml.jackson.core:jackson-databind:${versions.jackson_databind}"
   api "com.fasterxml.woodstox:woodstox-core:${versions.woodstox}"