diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 5bdf36909b3..f2f1912bf0a 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -43,7 +43,7 @@ jobs:
     - name: Install Linux requirements
       run: |
         sudo apt-get update -qq 
-        sudo apt-get install -qq -y libgtk-3-dev freeglut3-dev webkit2gtk-driver
+        sudo apt-get install -qq -y libgtk-3-dev libgtk-4-dev freeglut3-dev webkit2gtk-driver
       if: ${{ matrix.config.native == 'gtk.linux.x86_64'}}
     - name: Pull large static Windows binaries
       run: |
diff --git a/Jenkinsfile b/Jenkinsfile
index 6d60c8cda10..6b2e8404e98 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -24,7 +24,7 @@ kind: Pod
 spec:
   containers:
   - name: "swtbuild"
-    image: "eclipse/platformreleng-centos-swt-build:8"
+    image: "eclipse/platformreleng-centos-swt-build:9"
     imagePullPolicy: "Always"
     resources:
       limits:
diff --git a/binaries/pom.xml b/binaries/pom.xml
index ea59779ad29..0bd747cb498 100644
--- a/binaries/pom.xml
+++ b/binaries/pom.xml
@@ -135,12 +135,10 @@
 														</exec>
 													</then>
 													<else>
-														<property name="gtk_version" value="3.0" />
 														<exec dir="${build_dir}" executable="sh" failonerror="true">
 															<arg line="build.sh"/>
 															<env key="SWT_JAVA_HOME" value="${SWT_JAVA_HOME}"/>
 															<env key="OUTPUT_DIR" value="${project.basedir}"/>
-															<env key="GTK_VERSION" value="${gtk_version}"/>
 															<env key="MODEL" value="${arch}"/>
 															<arg line="install clean"/>
 														</exec>
diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/library/build.sh b/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/library/build.sh
index 1b8398b28c9..77aa4590366 100755
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/library/build.sh	
+++ b/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/library/build.sh	
@@ -273,14 +273,7 @@ func_build_gtk3 () {
 	fi
 }
 
-if [ "$1" = "-gtk-all" ]; then
-	shift
-	func_echo_plus "Note: When building multiple GTK versions, a cleanup is required (and automatically performed) between them."
-	func_clean_up
-	func_build_gtk4 "$@"
-	func_clean_up
-	func_build_gtk3 "$@"
-elif [ "$1" = "-gtk4" ]; then
+if [ "$1" = "-gtk4" ]; then
 	shift
 	func_build_gtk4 "$@"
 elif [ "$1" = "-gtk3" ]; then
@@ -288,7 +281,18 @@ elif [ "$1" = "-gtk3" ]; then
 	func_build_gtk3 "$@"
 elif [ "${GTK_VERSION}" = "4.0" ]; then
 	func_build_gtk4 "$@"
-elif [ "${GTK_VERSION}" = "3.0" -o "${GTK_VERSION}" = "" ]; then
-	export GTK_VERSION="3.0"
+elif [ "${GTK_VERSION}" = "3.0" ]; then
+	func_build_gtk3 "$@"
+else
+	func_echo_plus "==== Building GTK3 + GTK 4 ===="
+	func_echo_plus "See below for installed GTK versions:"
+	dpkg --get-selections | grep libgtk
+	apt list --installed libgtk*
+	func_build_gtk3 "$@"
+	shift
+	func_echo_plus "Note: When building multiple GTK versions, a cleanup is required (and automatically performed) between them."
+	func_clean_up
+	func_build_gtk4 "$@"
+	func_clean_up
 	func_build_gtk3 "$@"
 fi
diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/library/gtk3.h b/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/library/gtk3.h
index ed6b65e62ba..ecd2334427d 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/library/gtk3.h	
+++ b/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/library/gtk3.h	
@@ -10,6 +10,7 @@
  *
  * Contributors:
  *     Syntevo - initial API and implementation
+ * DUMMY CHANGE
  *******************************************************************************/
   
 #ifndef INC_gtk3_H
diff --git a/container/Dockerfile b/container/Dockerfile
index 574e2f758f6..f4c64fb043b 100644
--- a/container/Dockerfile
+++ b/container/Dockerfile
@@ -21,7 +21,7 @@ RUN chmod 555 /usr/local/bin/jenkins-slave && \
 ENTRYPOINT [ "uid_entrypoint", "jenkins-slave" ]
 
 RUN dnf -y update && dnf -y install \
-    java-openjdk maven webkit2gtk3-devel \
+    java-openjdk maven webkit2gtk3-devel libgtk-4-dev \
     make gcc mesa-libGLU-devel mesa-libGL-devel \
     libXt-devel procps-ng \
     && dnf clean all