diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 36adbe19d..0493ad8df 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -1,29 +1,22 @@
 name: xrpl4j-CI
 
-
 on:
   push:
   pull_request:
-    types: [assigned]
+    types: [ assigned ]
 jobs:
-  build_java8:
-    runs-on: ubuntu-20.04
+  build_jdk_temurin_8:
+    runs-on: ubuntu-latest
     steps:
       # Checks-out the repository under $GITHUB_WORKSPACE
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       # Set up Java 8
-      - name: Set up JDK 1.8
-        uses: actions/setup-java@v1
-        with:
-          java-version: 1.8
-      - name: Cache mvn dependencies
-        uses: actions/cache@v4
-        env:
-          cache-name: mvn-deps
+      - name: Set up JDK 8
+        uses: actions/setup-java@v4
         with:
-          path: ~/.m2
-          key: ${{ env.cache-name }}-${{ hashFiles('pom.xml') }}
-          restore-keys: ${{ env.cache-name }}-
+          distribution: 'temurin'
+          java-version: '8'
+          cache: 'maven'
       - name: Build
         run: mvn dependency:go-offline install
       - name: Upload to Codecov
@@ -32,130 +25,129 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: true
 
-  build_android:
-    runs-on: ubuntu-20.04
+  build_jdk_semeru_8:
+    runs-on: ubuntu-latest
     steps:
       # Checks-out the repository under $GITHUB_WORKSPACE
-      - uses: actions/checkout@v2
-      # Set up Android
-      - name: Setup Android SDK
-        uses: android-actions/setup-android@v2
-      - name: Cache mvn dependencies
-        uses: actions/cache@v4
-        env:
-          cache-name: mvn-deps
+      - uses: actions/checkout@v4
+      # Set up Java 8
+      - name: Set up JDK 8
+        uses: actions/setup-java@v4
         with:
-          path: ~/.m2
-          key: ${{ env.cache-name }}-${{ hashFiles('pom.xml') }}
-          restore-keys: ${{ env.cache-name }}-
+          distribution: 'semeru'
+          java-version: '8'
+          cache: 'maven'
       - name: Build
-        run: mvn dependency:go-offline install -Dmaven.javadoc.skip=true -Pandroid
+        run: mvn dependency:go-offline install
+
+  build_jdk_zulu_8:
+    runs-on: ubuntu-latest
+    steps:
+      # Checks-out the repository under $GITHUB_WORKSPACE
+      - uses: actions/checkout@v4
+      # Set up Java 8
+      - name: Set up JDK 8
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'zulu'
+          java-version: '8'
+          cache: 'maven'
+      - name: Build
+        run: mvn dependency:go-offline install
 
-  build_other_java:
-    runs-on: ubuntu-20.04
+  build_jdk_temurin_other:
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        # test against each major Java version
-        java: [ 9, 10, 11, 12, 13, 14, 15, 16, 17 ]
+        # test against each major Java version (Java 8 built separately above for codecov upload)
+        java: [ 11, 16, 17, 21 ]
     steps:
       # Checks-out the repository under $GITHUB_WORKSPACE
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       # Set up Java version
       - name: Set up JDK ${{ matrix.java }}
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v4
         with:
+          distribution: 'temurin'
           java-version: ${{ matrix.java }}
-      - name: Cache mvn dependencies
-        uses: actions/cache@v4
-        env:
-          cache-name: mvn-deps
-        with:
-          path: ~/.m2
-          key: ${{ env.cache-name }}-${{ hashFiles('pom.xml') }}
-          restore-keys: ${{ env.cache-name }}-
+          cache: 'maven'
       - name: Build
         run: mvn dependency:go-offline install -Dmaven.javadoc.skip=true
 
-  build_open_jdk_non_us:
-    runs-on: ubuntu-20.04
+  build_jdk_temurin_non_us:
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      # Set up Adopt OpenJDK Hotspot 16
-      - name: Set up OpenJDK 16
-        uses: actions/setup-java@v1
-        with:
-          distribution: adopt
-          java-version: 16
-      - name: Cache mvn dependencies
-        uses: actions/cache@v4
-        env:
-          cache-name: mvn-deps
+      - uses: actions/checkout@v4
+      # Set up Temurin 21
+      - name: Set up Temurin v21
+        uses: actions/setup-java@v4
         with:
-          path: ~/.m2
-          key: ${{ env.cache-name }}-${{ hashFiles('pom.xml') }}
-          restore-keys: ${{ env.cache-name }}-
+          distribution: 'temurin'
+          java-version: 21
+          cache: 'maven'
       # Maven install with JVM locale = de_DE
       - name: Build
         run: mvn dependency:go-offline install -Dmaven.javadoc.skip=true -DargLine="-Duser.language=de -Duser.country=DE"
 
+  build_android:
+    runs-on: ubuntu-latest
+    steps:
+      # Checks-out the repository under $GITHUB_WORKSPACE
+      - uses: actions/checkout@v4
+      # Set up Java 17
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+          cache: 'maven'
+      # Set up Android
+      - name: Setup Android SDK
+        uses: android-actions/setup-android@v3
+      - name: Build
+        run: mvn dependency:go-offline install -Dmaven.javadoc.skip=true -Pandroid
+
   build_devnet_its:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       # Checks-out the repository under $GITHUB_WORKSPACE
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       # Set up Java 8
-      - name: Set up JDK 1.8
-        uses: actions/setup-java@v1
-        with:
-          java-version: 1.8
-      - name: Cache mvn dependencies
-        uses: actions/cache@v4
-        env:
-          cache-name: mvn-deps
+      - name: Set up JDK 8
+        uses: actions/setup-java@v4
         with:
-          path: ~/.m2
-          key: ${{ env.cache-name }}-${{ hashFiles('pom.xml') }}
-          restore-keys: ${{ env.cache-name }}-
+          distribution: 'temurin'
+          java-version: '8'
+          cache: 'maven'
       - name: Build
         run: mvn dependency:go-offline install -Dmaven.javadoc.skip=true -DuseDevnet
 
   build_testnet_reporting_its:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       # Checks-out the repository under $GITHUB_WORKSPACE
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       # Set up Java 8
-      - name: Set up JDK 1.8
-        uses: actions/setup-java@v1
+      - name: Set up JDK 8
+        uses: actions/setup-java@v4
         with:
-          java-version: 1.8
-      - name: Cache mvn dependencies
-        uses: actions/cache@v4
-        env:
-          cache-name: mvn-deps
-        with:
-          path: ~/.m2
-          key: ${{ env.cache-name }}-${{ hashFiles('pom.xml') }}
-          restore-keys: ${{ env.cache-name }}-
+          distribution: 'temurin'
+          java-version: '8'
+          cache: 'maven' # setup-java v4 includes maven caching
       - name: Build
         run: mvn dependency:go-offline install -Dmaven.javadoc.skip=true -DuseTestnet
+
   build_testnet_clio_its:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       # Checks-out the repository under $GITHUB_WORKSPACE
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       # Set up Java 8
-      - name: Set up JDK 1.8
-        uses: actions/setup-java@v1
-        with:
-          java-version: 1.8
-      - name: Cache mvn dependencies
-        uses: actions/cache@v4
-        env:
-          cache-name: mvn-deps
+      - name: Set up JDK 8
+        uses: actions/setup-java@v4
         with:
-          path: ~/.m2
-          key: ${{ env.cache-name }}-${{ hashFiles('pom.xml') }}
-          restore-keys: ${{ env.cache-name }}-
+          distribution: 'temurin'
+          java-version: '8'
+          cache: 'maven'
       - name: Build
         run: mvn dependency:go-offline install -Dmaven.javadoc.skip=true -DuseClioTestnet -DuseClioMainnet