diff --git a/CHANGELOG.md b/CHANGELOG.md
index a7257a0d8dc8b..6fb2f4287950c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -37,6 +37,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Bump `com.gradle.enterprise` from 3.16.2 to 3.17.1 ([#13116](https://github.com/opensearch-project/OpenSearch/pull/13116), [#13191](https://github.com/opensearch-project/OpenSearch/pull/13191))
 - Bump `gradle/wrapper-validation-action` from 2 to 3 ([#13192](https://github.com/opensearch-project/OpenSearch/pull/13192))
 - Bump joda from 2.12.2 to 2.12.7 ([#13193](https://github.com/opensearch-project/OpenSearch/pull/13193))
+- Bump bouncycastle from 1.77 to 1.78 ([#13243](https://github.com/opensearch-project/OpenSearch/pull/13243))
 
 ### Changed
 - [BWC and API enforcement] Enforcing the presence of API annotations at build time ([#12872](https://github.com/opensearch-project/OpenSearch/pull/12872))
diff --git a/buildSrc/version.properties b/buildSrc/version.properties
index 58064b7d2994f..ae9abcd58aa3a 100644
--- a/buildSrc/version.properties
+++ b/buildSrc/version.properties
@@ -51,7 +51,7 @@ 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=1.77
+bouncycastle=1.78
 # test dependencies
 randomizedrunner  = 2.7.1
 junit             = 4.13.2
diff --git a/plugins/identity-shiro/licenses/bcprov-jdk18on-1.77.jar.sha1 b/plugins/identity-shiro/licenses/bcprov-jdk18on-1.77.jar.sha1
deleted file mode 100644
index 3e780df9559a9..0000000000000
--- a/plugins/identity-shiro/licenses/bcprov-jdk18on-1.77.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-2cc971b6c20949c1ff98d1a4bc741ee848a09523
\ No newline at end of file
diff --git a/plugins/identity-shiro/licenses/bcprov-jdk18on-1.78.jar.sha1 b/plugins/identity-shiro/licenses/bcprov-jdk18on-1.78.jar.sha1
new file mode 100644
index 0000000000000..47fb5fd5e5f5d
--- /dev/null
+++ b/plugins/identity-shiro/licenses/bcprov-jdk18on-1.78.jar.sha1
@@ -0,0 +1 @@
+619aafb92dc0b4c6cc4cf86c487ca48ee2d67a8e
\ No newline at end of file
diff --git a/plugins/ingest-attachment/licenses/bcmail-jdk18on-1.77.jar.sha1 b/plugins/ingest-attachment/licenses/bcmail-jdk18on-1.77.jar.sha1
deleted file mode 100644
index f71659316b8cd..0000000000000
--- a/plugins/ingest-attachment/licenses/bcmail-jdk18on-1.77.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-f2bb8aa55dc901ee8b8aae7d1007c03592d65e03
\ No newline at end of file
diff --git a/plugins/ingest-attachment/licenses/bcmail-jdk18on-1.78.jar.sha1 b/plugins/ingest-attachment/licenses/bcmail-jdk18on-1.78.jar.sha1
new file mode 100644
index 0000000000000..eb7e650306f73
--- /dev/null
+++ b/plugins/ingest-attachment/licenses/bcmail-jdk18on-1.78.jar.sha1
@@ -0,0 +1 @@
+d26f5514b8c54f2878f8d49e0bc8e2acaab3c8bd
\ No newline at end of file
diff --git a/plugins/ingest-attachment/licenses/bcpkix-jdk18on-1.77.jar.sha1 b/plugins/ingest-attachment/licenses/bcpkix-jdk18on-1.77.jar.sha1
deleted file mode 100644
index 05a8b2d5729bd..0000000000000
--- a/plugins/ingest-attachment/licenses/bcpkix-jdk18on-1.77.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-ed953791ba0229747dd0fd9911e3d76a462acfd3
\ No newline at end of file
diff --git a/plugins/ingest-attachment/licenses/bcpkix-jdk18on-1.78.jar.sha1 b/plugins/ingest-attachment/licenses/bcpkix-jdk18on-1.78.jar.sha1
new file mode 100644
index 0000000000000..385a9d930eede
--- /dev/null
+++ b/plugins/ingest-attachment/licenses/bcpkix-jdk18on-1.78.jar.sha1
@@ -0,0 +1 @@
+dd61bcdb87678451dd42d42e267979bd4b4451a1
\ No newline at end of file
diff --git a/plugins/ingest-attachment/licenses/bcprov-jdk18on-1.77.jar.sha1 b/plugins/ingest-attachment/licenses/bcprov-jdk18on-1.77.jar.sha1
deleted file mode 100644
index 3e780df9559a9..0000000000000
--- a/plugins/ingest-attachment/licenses/bcprov-jdk18on-1.77.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-2cc971b6c20949c1ff98d1a4bc741ee848a09523
\ No newline at end of file
diff --git a/plugins/ingest-attachment/licenses/bcprov-jdk18on-1.78.jar.sha1 b/plugins/ingest-attachment/licenses/bcprov-jdk18on-1.78.jar.sha1
new file mode 100644
index 0000000000000..47fb5fd5e5f5d
--- /dev/null
+++ b/plugins/ingest-attachment/licenses/bcprov-jdk18on-1.78.jar.sha1
@@ -0,0 +1 @@
+619aafb92dc0b4c6cc4cf86c487ca48ee2d67a8e
\ No newline at end of file