diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
index 6cdcad4..0d87579 100644
--- a/.github/workflows/gradle.yml
+++ b/.github/workflows/gradle.yml
@@ -21,7 +21,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        java: [ 11, 17, 21 ]
+        java: [ 21 ]
         os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
     - uses: actions/checkout@v2
diff --git a/build.gradle b/build.gradle
index 4a333a1..fe61c53 100644
--- a/build.gradle
+++ b/build.gradle
@@ -25,6 +25,11 @@ allprojects {
     checkstyle {
         toolVersion = "10.12.3"
     }
+    
+    java {
+      targetCompatibility = JavaVersion.VERSION_21
+      sourceCompatibility = JavaVersion.VERSION_21
+    }
 }
 
 subprojects {
@@ -66,6 +71,9 @@ subprojects {
             // Force opensearch transport-netty4-client depending on newer version of netty-handler due to CVE-2023-34462.
             // Remove after upgrading the compiled opensearch version.
             force "io.netty:netty-handler:4.1.94.Final"
+            force "org.bouncycastle:bcpkix-jdk15to18:1.78.1"
+            force "org.bouncycastle:bcprov-jdk15to18:1.78.1"
+            force "org.bouncycastle:bcutil-jdk15to18:1.78.1"
         }
     }
     
@@ -108,9 +116,9 @@ subprojects {
         implementation("org.glassfish.hk2:hk2-api:2.6.1")
         implementation("org.apache.httpcomponents:httpclient:4.5.14")
         implementation("org.apache.httpcomponents:httpcore:4.4.15")
-        implementation("org.bouncycastle:bcpkix-jdk15to18:1.74")
-        implementation("org.bouncycastle:bcprov-jdk15to18:1.74")
-        implementation("org.bouncycastle:bcutil-jdk15to18:1.74")
+        implementation("org.bouncycastle:bcpkix-jdk15to18:1.78.1")
+        implementation("org.bouncycastle:bcprov-jdk15to18:1.78.1")
+        implementation("org.bouncycastle:bcutil-jdk15to18:1.78.1")
         implementation("org.javassist:javassist:3.25.0-GA")
         implementation("io.vavr:vavr:0.10.2")
         implementation("io.vavr:vavr-match:0.10.2")
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index d64cd49..2c35211 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index a595206..cce662e 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
+distributionSha256Sum=d725d707bfabd4dfdc958c624003b3c80accc03f7037b5122c4b1d0ef15cecab
diff --git a/gradlew b/gradlew
index 1aa94a4..f5feea6 100755
--- a/gradlew
+++ b/gradlew
@@ -15,6 +15,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
 #
@@ -55,7 +57,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
@@ -84,7 +86,8 @@ done
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
 # Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
-APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
+' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
diff --git a/gradlew.bat b/gradlew.bat
index 6689b85..9b42019 100644
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -13,6 +13,8 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 @rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
 
 @if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
@@ -43,11 +45,11 @@ set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
 if %ERRORLEVEL% equ 0 goto execute
 
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -57,11 +59,11 @@ set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
 if exist "%JAVA_EXE%" goto execute
 
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail