diff --git a/gradle.properties b/gradle.properties
index a601e0438708..5cf101a77fcf 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -44,7 +44,7 @@ atomikosTransactionsVersion=5.0.8
 awaitilityVersion=3.1.6
 balMessagingBrokerAmqpVersion=0.970.5
 bitbucketCowwocVersion=1.2
-bouncycastleVersion=1.61
+bouncycastleVersion=1.78
 bytedecoJavacppPlatformVersion=6.0.1-1.4.2
 checkStyleToolVersion=10.12.0
 chewiebugGcviewerVersion=1.36
diff --git a/gradle/javaProject.gradle b/gradle/javaProject.gradle
index 68dc122517be..1c0ec5e69977 100644
--- a/gradle/javaProject.gradle
+++ b/gradle/javaProject.gradle
@@ -67,8 +67,8 @@ dependencies {
         implementation "org.codehaus.woodstox:stax2-api:${project.codehausWoodstoxStax2ApiVersion}"
         implementation "org.awaitility:awaitility:${project.awaitilityVersion}"
 
-        implementation "org.bouncycastle:bcprov-jdk15on:${project.bouncycastleVersion}"
-        implementation "org.bouncycastle:bcpkix-jdk15on:${project.bouncycastleVersion}"
+        implementation "org.bouncycastle:bcprov-jdk18on:${project.bouncycastleVersion}"
+        implementation "org.bouncycastle:bcpkix-jdk18on:${project.bouncycastleVersion}"
         implementation "org.bytedeco.javacpp-presets:llvm-platform:${project.bytedecoJavacppPlatformVersion}"
         implementation "org.codehaus.plexus:plexus-utils:${project.codehausPlexusUtilsVersion}"
         implementation "org.eclipse.lsp4j:org.eclipse.lsp4j:${project.eclipseLsp4jVersion}"
diff --git a/tests/ballerina-test-utils/build.gradle b/tests/ballerina-test-utils/build.gradle
index 71ea8da860a9..bc2e08db8425 100644
--- a/tests/ballerina-test-utils/build.gradle
+++ b/tests/ballerina-test-utils/build.gradle
@@ -75,8 +75,8 @@ shadowJar {
         exclude(dependency('commons-pool.wso2:commons-pool'))
         exclude(dependency('commons-pool:commons-pool'))
         exclude(dependency('org.wso2.orbit.org.yaml:snakeyaml'))
-        exclude(dependency('org.bouncycastle:bcprov-jdk15on'))
-        exclude(dependency('org.bouncycastle:bcpkix-jdk15on'))
+        exclude(dependency('org.bouncycastle:bcprov-jdk18on'))
+        exclude(dependency('org.bouncycastle:bcpkix-jdk18on'))
         exclude(dependency('io.netty:netty-tcnative-boringssl-static'))
         exclude(dependency('org.testng:testng'))
         exclude(dependency('com.beust:jcommander'))