diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 694725891..7355e6dc2 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -37,10 +37,10 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v4
 
-    - name: Set up JDK 8
+    - name: Set up JDK 11
       uses: actions/setup-java@v4
       with:
-        java-version: '8'
+        java-version: '11'
         distribution: 'temurin'
 
     # Initializes the CodeQL tools for scanning.
diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
index b2b7b69bf..4cd198407 100644
--- a/.github/workflows/gradle.yml
+++ b/.github/workflows/gradle.yml
@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        java: [ '8', '11', '17', '21']
+        java: ['11', '17', '21']
 
     steps:
     - uses: actions/checkout@v4
diff --git a/README.md b/README.md
index 304deebaf..a3c119678 100755
--- a/README.md
+++ b/README.md
@@ -25,8 +25,11 @@ all unit tests, and create the jar, run:
 
     ./gradlew build --warning-mode all
 
-RSTA 3.0 and newer requires Java 8 to compile and run.  If you need
-Java 6 compatibility, you'll need to use a 2.6.x version.
+RSTA 4.0 and newer requires Java 11 to compile and run. If you need
+to support older Java versions:
+
+* RSTA 3.x requires Java 8
+* RSTA 2.6.x supports Java 6
 
 # Demos
 
diff --git a/RSyntaxTextArea/build.gradle b/RSyntaxTextArea/build.gradle
index 10a942ffc..2fb1e05c2 100755
--- a/RSyntaxTextArea/build.gradle
+++ b/RSyntaxTextArea/build.gradle
@@ -2,9 +2,9 @@ import static org.gradle.api.JavaVersion.*
 
 ['base', 'jacoco', 'biz.aQute.bnd.builder', 'distribution', 'maven-publish', 'signing'].each { apply plugin: it }
 
-// We require building with JDK 8 or later.  We turn off doclint since our
+// We require building with JDK 11 or later.  We turn off doclint since our
 // generated *TokenMakers have horrible documentation (see https://github.com/jflex-de/jflex/issues/182)
-assert current().isJava8Compatible()
+assert current().isJava11Compatible()
 allprojects {
 	tasks.withType(Javadoc) {
 		options.addStringOption('Xdoclint:none', '-quiet')
diff --git a/build.gradle b/build.gradle
index 941fc1a46..3f99d37ec 100755
--- a/build.gradle
+++ b/build.gradle
@@ -12,7 +12,7 @@ plugins {
 }
 
 group 'com.fifesoft'
-// NOTE: Local Java 8:  /Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home
+// NOTE: Local Java 11:  /Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home
 
 allprojects {
 
diff --git a/gradle.properties b/gradle.properties
index 62c1a58ea..ea4f3eb8d 100755
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,6 +1,9 @@
 # Note that Maven- and signing-related properties are in <maven-home>/gradle.properties
+
+# This controls source- and target-compatibility.
+# Our builds require Java 11+, but still built artifacts compatible with Java 8.
 javaVersion=1.8
-version=3.5.3-SNAPSHOT
+version=4.0.0-SNAPSHOT
 
 # Ugh, see https://github.com/gradle/gradle/issues/11308
 systemProp.org.gradle.internal.publish.checksums.insecure=true