diff --git a/features/org.eclipse.objectteams.otdt.core.patch/feature.xml b/features/org.eclipse.objectteams.otdt.core.patch/feature.xml
index 6145597..b1c35f7 100644
--- a/features/org.eclipse.objectteams.otdt.core.patch/feature.xml
+++ b/features/org.eclipse.objectteams.otdt.core.patch/feature.xml
@@ -59,7 +59,7 @@
    </url>
 
    <requires>
-      <import feature="org.eclipse.jdt" version="3.11.0.v20150528-0700" patch="true"/>
+      <import feature="org.eclipse.jdt" version="3.11.0.v20150603-2000" patch="true"/>
    </requires>
 
    <plugin
diff --git a/releng/build-scripts/build/otdt_prerequisites.sh b/releng/build-scripts/build/otdt_prerequisites.sh
index d03b774..4431c19 100644
--- a/releng/build-scripts/build/otdt_prerequisites.sh
+++ b/releng/build-scripts/build/otdt_prerequisites.sh
@@ -52,14 +52,14 @@
 
 # VERSIONS:
 # Eclipse SDK build identifier (used for substitution in otdt.map.in etc.):
-SDK_QUALIFIER=I20150528-0700
+SDK_QUALIFIER=I20150603-2000
 
 # Architecture (as used by OSGi):
 ARCH=`arch`
 
 # used only locally (components of the ECLIPSE_SDK_TGZ path):
-EVERSION=4.5RC3
-DROP=${BASEDIR}/drops4/S-4.5RC3-201505280700
+EVERSION=4.5RC4
+DROP=${BASEDIR}/drops4/S-4.5RC4-201506032000
 
 # EXPORT: archive file of the base eclipse SDK build:
 ECLIPSE_SDK_TGZ=${DROP}/eclipse-SDK-${EVERSION}-linux-gtk-${ARCH}.tar.gz
diff --git a/releng/build-scripts/build/run.properties b/releng/build-scripts/build/run.properties
index 81bbaa1..1eb9f32 100644
--- a/releng/build-scripts/build/run.properties
+++ b/releng/build-scripts/build/run.properties
@@ -26,8 +26,8 @@
 org.eclipse.equinox.launcher_jar=org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar
 
 # for patching our patch feature to match this version with any suffix:
-jdt.feature.version=3.11.0.v20150528-0700
-jdt.feature.version.next=3.11.0.v20150528-0701
+jdt.feature.version=3.11.0.v20150603-2000
+jdt.feature.version.next=3.11.0.v20150603-2001
 # -----------------------------------------------------------
 
 #Git Support for PDE BUILD:
diff --git a/releng/map/otdt.map.in b/releng/map/otdt.map.in
index 0a83181..c5007d5 100644
--- a/releng/map/otdt.map.in
+++ b/releng/map/otdt.map.in
@@ -43,11 +43,11 @@
 plugin@org.eclipse.objectteams.otdt.samples=GIT,repo=git://git.eclipse.org/gitroot/objectteams/org.eclipse.objectteams.git,path=plugins/org.eclipse.objectteams.otdt.samples,tag=builds/201406101339
 
 !** Consume BCEL from Orbit: **!
-plugin@org.apache.bcel,5.2.0=p2IU,id=org.apache.bcel,version=5.2.0.v201005080400,repository=http://download.eclipse.org/tools/orbit/downloads/drops/R20140525021250/repository
+plugin@org.apache.bcel,5.2.0=p2IU,id=org.apache.bcel,version=5.2.0.v201005080400,repository=http://download.eclipse.org/tools/orbit/downloads/drops/R20150519210750/repository
 !** ASM from Orbit: **!
-plugin@org.objectweb.asm,5.0.1=p2IU,id=org.objectweb.asm,version=5.0.1.v201404251740,repository=http://download.eclipse.org/tools/orbit/downloads/drops/R20140525021250/repository/
-plugin@org.objectweb.asm.tree,5.0.1=p2IU,id=org.objectweb.asm.tree,version=5.0.1.v201404251740,repository=http://download.eclipse.org/tools/orbit/downloads/drops/R20140525021250/repository/
-plugin@org.objectweb.asm.commons,5.0.1=p2IU,id=org.objectweb.asm.commons,version=5.0.1.v201404251740,repository=http://download.eclipse.org/tools/orbit/downloads/drops/R20140525021250/repository/
+plugin@org.objectweb.asm,5.0.1=p2IU,id=org.objectweb.asm,version=5.0.1.v201404251740,repository=http://download.eclipse.org/tools/orbit/downloads/drops/R20150519210750/repository/
+plugin@org.objectweb.asm.tree,5.0.1=p2IU,id=org.objectweb.asm.tree,version=5.0.1.v201404251740,repository=http://download.eclipse.org/tools/orbit/downloads/drops/R20150519210750/repository/
+plugin@org.objectweb.asm.commons,5.0.1=p2IU,id=org.objectweb.asm.commons,version=5.0.1.v201404251740,repository=http://download.eclipse.org/tools/orbit/downloads/drops/R20150519210750/repository/
 
 !========== JDT/UI: ==========!
 plugin@org.eclipse.jdt.ui=GIT,tag=@SDK_QUALIFIER@,repo=git://git.eclipse.org/gitroot/jdt/eclipse.jdt.ui.git,path=org.eclipse.jdt.ui