diff --git a/.github/workflows/test-pr.yml b/.github/workflows/test-pr.yml
index 79b18f0c..15e3451d 100644
--- a/.github/workflows/test-pr.yml
+++ b/.github/workflows/test-pr.yml
@@ -7,16 +7,19 @@ on:
 jobs:
   build:
     name: Checkout and Build
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
+
+    continue-on-error: true
 
     strategy:
+      fail-fast: false
       matrix:
-        java-version: [8, 11, 16, 17]
+        java-version: [8, 11, 16, 17, 21]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: JDK setup
-        uses: actions/setup-java@v2
+        uses: actions/setup-java@v4
         with:
           java-version: ${{ matrix.java-version }}
           distribution: 'temurin'
@@ -44,11 +47,11 @@ jobs:
 
   coverage:
     name: Quality Assurance
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     needs: [ build ]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Download metadata coverage report
         uses: actions/download-artifact@master
         with:
diff --git a/.github/workflows/update-jakarta-workflow.yml b/.github/workflows/update-jakarta-workflow.yml
index fb87747d..8e05273d 100644
--- a/.github/workflows/update-jakarta-workflow.yml
+++ b/.github/workflows/update-jakarta-workflow.yml
@@ -9,18 +9,21 @@ jobs:
   checkout-and-build:
     runs-on: ubuntu-latest
 
+    continue-on-error: true
+
     strategy:
+      fail-fast: false
       matrix:
-        java-version: [11, 16, 17]
+        java-version: [11, 16, 17, 21]
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
           ref: integration
       - name: JDK setup
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           java-version: ${{ matrix.java-version }}
           distribution: 'temurin'
@@ -44,7 +47,7 @@ jobs:
     needs: checkout-and-build
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
           ref: integration
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index d294077a..00000000
--- a/.travis.yml
+++ /dev/null
@@ -1,13 +0,0 @@
-language: java
-sudo: required
-dist: trusty
-
-jdk:
-  - openjdk8
-  - oraclejdk8
-  - openjdk11
-
-branches:
-  except:
-    - /^v|d\d+\.\d+\.\d+$/
-    - /^jenkins-veraPDF-pdfbox-validation-v|d\\d+\\.\\d+\\.\\d+$/
diff --git a/README.md b/README.md
index b0b4ac1e..d89378d7 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ Quick Start
 
 In order to build the parser you'll need:
 
- * Java 9 - 17, which can be downloaded [from Oracle](https://www.oracle.com/technetwork/java/javase/downloads/index.html), or for Linux users [OpenJDK](https://openjdk.java.net/install/index.html).
+ * Java 9 - 21, which can be downloaded [from Oracle](https://www.oracle.com/technetwork/java/javase/downloads/index.html), or for Linux users [OpenJDK](https://openjdk.java.net/install/index.html).
  * [Maven v3+](https://maven.apache.org/)
 
 ### Building the veraPDF PDF Box Validation Model