diff --git a/.github/workflows/build-2.x.yml b/.github/workflows/build-2.x.yml
index 230e247..17a6726 100644
--- a/.github/workflows/build-2.x.yml
+++ b/.github/workflows/build-2.x.yml
@@ -21,8 +21,8 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-versions: ["7.4", "8.0", "8.1"]
-        drupal-version: ["9.3.x", "9.4.x", "9.5.x-dev"]
+        php-versions: ["8.0", "8.1"]
+        drupal-version: ["9.5.x"]
 
     env:
       DRUPAL_VERSION: ${{ matrix.drupal-version }}
diff --git a/.github/workflows/build-3.x.yml b/.github/workflows/build-3.x.yml
new file mode 100644
index 0000000..eb70911
--- /dev/null
+++ b/.github/workflows/build-3.x.yml
@@ -0,0 +1,111 @@
+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the action will run.
+on:
+  # Triggers the workflow on push or pull request events but only for the 8.x branch
+  push:
+    branches: [ 3.x ]
+  pull_request:
+    branches: [ 3.x ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-versions: ["8.1"]
+        drupal-version: ["10.0.x", "10.1.x-dev"]
+
+    env:
+      DRUPAL_VERSION: ${{ matrix.drupal-version }}
+      SCRIPT_DIR: ${{ github.workspace }}/islandora_ci
+      DRUPAL_DIR: /opt/drupal
+      DRUPAL_WEB_ROOT: /opt/drupal/web
+      PHPUNIT_FILE: ${{ github.workspace }}/build_dir/phpunit.xml
+
+    services:
+      mysql:
+        image: mysql:8.0
+        env:
+          MYSQL_ALLOW_EMPTY_PASSWORD: yes
+          MYSQL_DATABASE: drupal
+        ports:
+          - 3306:3306
+      activemq:
+        image: webcenter/activemq:5.14.3
+        ports:
+          - 8161:8161
+          - 61616:61616
+          - 61613:61613
+
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          path: build_dir
+
+      - name: Checkout islandora_ci
+        uses: actions/checkout@v2
+        with:
+          repository: islandora/islandora_ci
+          ref: github-actions
+          path: islandora_ci
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          tools: composer:v2
+
+      - name: Setup Mysql client
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y mysql-client
+
+      - name: Cache Composer dependencies
+        uses: actions/cache@v2
+        with:
+          path: /tmp/composer-cache
+          key: ${{ runner.os }}-${{ hashFiles('**/composer.lock') }}
+
+      - name: Setup Drupal
+        run: |
+          mkdir $DRUPAL_DIR
+          $SCRIPT_DIR/travis_setup_drupal.sh
+          cd $DRUPAL_DIR
+          chmod -R u+w web/sites/default
+          mkdir -p web/sites/simpletest/browser_output
+
+      - name: Setup composer paths
+        run: |
+          git -C "$GITHUB_WORKSPACE/build_dir" checkout -b github-testing
+          cd $DRUPAL_DIR
+          composer config repositories.local path "$GITHUB_WORKSPACE/build_dir"
+          composer config minimum-stability dev
+          composer require "islandora/jsonld:dev-github-testing as dev-2.x" --prefer-source -W
+
+      - name: Install modules
+        run: |
+          cd $DRUPAL_DIR/web
+          drush --uri=127.0.0.1:8282 en -y user jsonld
+
+      - name: Copy PHPunit file
+        run: cp $PHPUNIT_FILE $DRUPAL_DIR/web/core/phpunit.xml
+
+      - name: Test scripts
+        run: $SCRIPT_DIR/travis_scripts.sh
+
+        # Unit test config is defined in the module's phpunit.xml file.
+      - name: PHPUNIT tests
+        run: |
+          cd $DRUPAL_DIR/web/core
+          $DRUPAL_DIR/vendor/bin/phpunit --verbose --debug
diff --git a/README.md b/README.md
index bca292d..fe82c04 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,9 @@
 
 ## Introduction
 
-JSON-LD Serializer for Drupal 8 and Islandora.
+JSON-LD Serializer for Drupal 10 and Islandora.
+
+NOTE: This 3.x branch is compatible with Drupal 10. For progress in D10 compatibility with the rest of Islandora, see [ticket](https://github.com/Islandora/documentation/issues/2235).
 
 This module adds a simple Drupal entity to JSON-LD 
 `normalizer/serializer/unserializer` service provider and a few supporting 
diff --git a/composer.json b/composer.json
index 3d1a93f..652a24e 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,9 @@
         }
     ],
     "require" : {
-        "php": ">=7.4"
+        "php": ">=7.4",
+        "drupal/hal": "^1||^2",
+        "drupal/rdf": "^2.1"
     },
     "require-dev": {
         "phpunit/phpunit": "^8",
diff --git a/jsonld.info.yml b/jsonld.info.yml
index 53e9b62..8fd21d4 100644
--- a/jsonld.info.yml
+++ b/jsonld.info.yml
@@ -2,8 +2,8 @@ name: 'JSON-LD'
 type: module
 description: 'Serializes entities to JSON-LD / LDP for the Islandora Project'
 package: Web services
-core_version_requirement: ^9
+core_version_requirement: ^10
 dependencies:
-  - hal
-  - serialization
-  - rdf
+  - drupal:serialization
+  - hal:hal
+  - rdf:rdf
diff --git a/src/ContextGenerator/JsonldContextGenerator.php b/src/ContextGenerator/JsonldContextGenerator.php
index f9a2cc8..b0ccc7e 100644
--- a/src/ContextGenerator/JsonldContextGenerator.php
+++ b/src/ContextGenerator/JsonldContextGenerator.php
@@ -333,9 +333,8 @@ protected function getTermContextFromField($field_type) {
     // yet for this instance.
     if (empty($this->fieldMappings)) {
       // Cribbed from rdf module's rdf_get_namespaces.
-      foreach (\Drupal::moduleHandler()->getImplementations(self::FIELD_MAPPPINGS_HOOK) as $module) {
-        $function = $module . '_' . self::FIELD_MAPPPINGS_HOOK;
-        foreach ($function() as $field => $mapping) {
+      \Drupal::moduleHandler()->invokeAllWith(self::FIELD_MAPPPINGS_HOOK, function (callable $hook, string $module) {
+        foreach ($hook() as $field => $mapping) {
           if (array_key_exists($field, $this->fieldMappings)) {
             $this->logger->warning(
               t('Tried to map @field_type to @new_type, but @field_type is already mapped to @orig_type.', [
@@ -349,7 +348,7 @@ protected function getTermContextFromField($field_type) {
             $this->fieldMappings[$field] = $mapping;
           }
         }
-      }
+      });
     }
     return array_key_exists($field_type, $this->fieldMappings) ? $this->fieldMappings[$field_type] : $default_mapping;
   }
diff --git a/src/Encoder/JsonldEncoder.php b/src/Encoder/JsonldEncoder.php
index 72e8537..aee2ec0 100644
--- a/src/Encoder/JsonldEncoder.php
+++ b/src/Encoder/JsonldEncoder.php
@@ -22,7 +22,7 @@ class JsonldEncoder extends SymfonyJsonEncoder {
   /**
    * {@inheritdoc}
    */
-  public function supportsEncoding($format) {
+  public function supportsEncoding(string $format): bool {
 
     return $format == $this->format;
   }
@@ -30,7 +30,7 @@ public function supportsEncoding($format) {
   /**
    * {@inheritdoc}
    */
-  public function supportsDecoding($format) {
+  public function supportsDecoding(string $format): bool {
 
     return $format == $this->format;
   }
diff --git a/src/Normalizer/NormalizerBase.php b/src/Normalizer/NormalizerBase.php
index b8a40ac..65802fb 100644
--- a/src/Normalizer/NormalizerBase.php
+++ b/src/Normalizer/NormalizerBase.php
@@ -20,7 +20,7 @@ abstract class NormalizerBase extends SerializationNormalizerBase implements Den
   /**
    * {@inheritdoc}
    */
-  public function supportsNormalization($data, $format = NULL) {
+  public function supportsNormalization($data, string $format = NULL, array $context = []): bool {
 
     return in_array($format, $this->formats) && parent::supportsNormalization($data, $format);
   }
@@ -28,7 +28,7 @@ public function supportsNormalization($data, $format = NULL) {
   /**
    * {@inheritdoc}
    */
-  public function supportsDenormalization($data, $type, $format = NULL) {
+  public function supportsDenormalization($data, string $type, string $format = NULL, array $context = []): bool {
 
     if (in_array($format, $this->formats) && (class_exists($this->supportedInterfaceOrClass) || interface_exists($this->supportedInterfaceOrClass))) {
       $target = new \ReflectionClass($type);
diff --git a/tests/src/Functional/JsonldContextGeneratorTest.php b/tests/src/Functional/JsonldContextGeneratorTest.php
index 649e4f3..3f9e0f9 100644
--- a/tests/src/Functional/JsonldContextGeneratorTest.php
+++ b/tests/src/Functional/JsonldContextGeneratorTest.php
@@ -94,7 +94,7 @@ public function testJsonldcontextContentypeheaderResponseIsValid() {
     );
     $this->drupalGet($url);
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertEquals($this->drupalGetHeader('Content-Type'), 'application/ld+json', 'Correct JSON-LD mime type was returned');
+    $this->assertEquals($this->getSession()->getResponseHeader('Content-Type'), 'application/ld+json', 'Correct JSON-LD mime type was returned');
   }
 
   /**
@@ -121,7 +121,7 @@ public function testJsonldcontextResponseIsValid() {
     $this->drupalGet($url);
     $this->assertSession()->statusCodeEquals(200);
     $jsonldarray = json_decode($this->getSession()->getPage()->getContent(), TRUE);
-    $this->verbose($jsonldarray);
+    dump($jsonldarray);
     $this->assertEquals($expected, $jsonldarray, "Returned @context matches expected response.");
   }
 
diff --git a/tests/src/Kernel/JsonldContextGeneratorTest.php b/tests/src/Kernel/JsonldContextGeneratorTest.php
index 85d5c99..ecbafe3 100644
--- a/tests/src/Kernel/JsonldContextGeneratorTest.php
+++ b/tests/src/Kernel/JsonldContextGeneratorTest.php
@@ -17,7 +17,7 @@ class JsonldContextGeneratorTest extends JsonldKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'entity_test',
     'hal',
     'jsonld',
diff --git a/tests/src/Kernel/JsonldHookTest.php b/tests/src/Kernel/JsonldHookTest.php
index b7ae0b7..ccfc17b 100644
--- a/tests/src/Kernel/JsonldHookTest.php
+++ b/tests/src/Kernel/JsonldHookTest.php
@@ -13,7 +13,7 @@ class JsonldHookTest extends JsonldKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'entity_test',
     'hal',
     'jsonld',
diff --git a/tests/src/Kernel/JsonldKernelTestBase.php b/tests/src/Kernel/JsonldKernelTestBase.php
index 24c8e8f..13d05b4 100644
--- a/tests/src/Kernel/JsonldKernelTestBase.php
+++ b/tests/src/Kernel/JsonldKernelTestBase.php
@@ -24,7 +24,7 @@ abstract class JsonldKernelTestBase extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'system',
     'user',
     'field',
diff --git a/tests/src/Kernel/JsonldTestEntityGenerator.php b/tests/src/Kernel/JsonldTestEntityGenerator.php
index 8d5c4f1..13fca31 100644
--- a/tests/src/Kernel/JsonldTestEntityGenerator.php
+++ b/tests/src/Kernel/JsonldTestEntityGenerator.php
@@ -158,7 +158,7 @@ public function makeDuplicateReferenceMapping(): JsonldTestEntityGenerator {
    *   Error saving the entity.
    */
   public function generateNewEntity(): array {
-    $dt = new \DateTime(NULL, new \DateTimeZone('UTC'));
+    $dt = new \DateTime('now', new \DateTimeZone('UTC'));
     $created = $dt->format("U");
     $created_iso = $dt->format(\DateTime::W3C);
     // Create an entity.