diff --git a/MANIFEST.MF b/MANIFEST.MF
index 9f2ffa1..88bab9e 100644
--- a/MANIFEST.MF
+++ b/MANIFEST.MF
@@ -1,28 +1,28 @@
 Manifest-Version: 1.0
-Main-Class: org.eclipse.jdt.internal.compiler.batch.Main
-Bundle-ManifestVersion: 2
-Bundle-Name: Eclipse Compiler for Java(TM)
+Archiver-Version: Plexus Archiver
+Created-By: Apache Maven
+Built-By: e4Build
+Build-Jdk: 1.8.0_51
 Bundle-SymbolicName: org.eclipse.jdt.core.compiler.batch
-Bundle-Version: 3.11.0.qualifier
+Export-Package: org.eclipse.jdt.core,org.eclipse.jdt.core.compiler,org
+ .eclipse.jdt.internal.antadapter;x-internal:=true,org.eclipse.jdt.int
+ ernal.compiler;x-internal:=true,org.eclipse.jdt.internal.compiler.apt
+ .dispatch;x-internal:=true,org.eclipse.jdt.internal.compiler.apt.mode
+ l;x-internal:=true,org.eclipse.jdt.internal.compiler.apt.util;x-inter
+ nal:=true,org.eclipse.jdt.internal.compiler.ast;x-internal:=true,org.
+ eclipse.jdt.internal.compiler.batch;x-internal:=true,org.eclipse.jdt.
+ internal.compiler.classfmt;x-internal:=true,org.eclipse.jdt.internal.
+ compiler.codegen;x-internal:=true,org.eclipse.jdt.internal.compiler.e
+ nv;x-internal:=true,org.eclipse.jdt.internal.compiler.flow;x-internal
+ :=true,org.eclipse.jdt.internal.compiler.impl;x-internal:=true,org.ec
+ lipse.jdt.internal.compiler.lookup;x-internal:=true,org.eclipse.jdt.i
+ nternal.compiler.parser;x-internal:=true,org.eclipse.jdt.internal.com
+ piler.parser.diagnose;x-internal:=true,org.eclipse.jdt.internal.compi
+ ler.problem;x-internal:=true,org.eclipse.jdt.internal.compiler.util;x
+ -internal:=true,org.eclipse.jdt.internal.compiler.tool;x-internal:=true
+Bundle-Name: Eclipse Compiler for Java(TM)
+Bundle-Version: 3.11.1.v20150902-1521
 Bundle-ClassPath: .
+Bundle-ManifestVersion: 2
 Bundle-Vendor: Eclipse.org
-Export-Package: org.eclipse.jdt.core,
- org.eclipse.jdt.core.compiler,
- org.eclipse.jdt.internal.antadapter;x-internal:=true,
- org.eclipse.jdt.internal.compiler;x-internal:=true,
- org.eclipse.jdt.internal.compiler.apt.dispatch;x-internal:=true,
- org.eclipse.jdt.internal.compiler.apt.model;x-internal:=true,
- org.eclipse.jdt.internal.compiler.apt.util;x-internal:=true,
- org.eclipse.jdt.internal.compiler.ast;x-internal:=true,
- org.eclipse.jdt.internal.compiler.batch;x-internal:=true,
- org.eclipse.jdt.internal.compiler.classfmt;x-internal:=true,
- org.eclipse.jdt.internal.compiler.codegen;x-internal:=true,
- org.eclipse.jdt.internal.compiler.env;x-internal:=true,
- org.eclipse.jdt.internal.compiler.flow;x-internal:=true,
- org.eclipse.jdt.internal.compiler.impl;x-internal:=true,
- org.eclipse.jdt.internal.compiler.lookup;x-internal:=true,
- org.eclipse.jdt.internal.compiler.parser;x-internal:=true,
- org.eclipse.jdt.internal.compiler.parser.diagnose;x-internal:=true,
- org.eclipse.jdt.internal.compiler.problem;x-internal:=true,
- org.eclipse.jdt.internal.compiler.util;x-internal:=true,
- org.eclipse.jdt.internal.compiler.tool;x-internal:=true
+Main-Class: org.eclipse.jdt.internal.compiler.batch.Main
diff --git a/ecj-include-props.patch b/ecj-include-props.patch
deleted file mode 100644
index f1b3110..0000000
--- a/ecj-include-props.patch
+++ /dev/null
@@ -1,10 +0,0 @@
---- build.xml	2014-05-01 09:36:51.417339328 +0300
-+++ build.xml	2014-05-01 09:38:36.330493400 +0300
-@@ -49,6 +49,7 @@
- 				<include name="**/readableNames.props"/>
- 				<include name="META-INF/**"/>
- 				<include name="**/*.properties"/>
-+				<include name="**/*.props"/>
- 				<exclude name="META-INF/eclipse.inf"/>
- 			</fileset>
- 		</zip>
diff --git a/ecj.sh.in b/ecj.sh.in
index 3ca7c0d..d8a40e9 100644
--- a/ecj.sh.in
+++ b/ecj.sh.in
@@ -1,4 +1,4 @@
 #!/bin/sh
 
-CLASSPATH=@JAVADIR@/ecj.jar:${CLASSPATH=.} \
+CLASSPATH=$(build-classpath ecj):${CLASSPATH=.} \
 java org.eclipse.jdt.internal.compiler.batch.Main "$@"
diff --git a/ecj.spec b/ecj.spec
index 5c3ba93..bb58584 100644
--- a/ecj.spec
+++ b/ecj.spec
@@ -1,10 +1,10 @@
 Epoch: 1
 
-%global qualifier R-4.5-201506032000
+%global qualifier R-4.5.1-201509040015
 
 Summary: Eclipse Compiler for Java
 Name: ecj
-Version: 4.5
+Version: 4.5.1
 Release: 1%{?dist}
 URL: http://www.eclipse.org
 License: EPL
@@ -12,12 +12,11 @@ License: EPL
 Source0: http://download.eclipse.org/eclipse/downloads/drops4/%{qualifier}/ecjsrc-%{version}.jar
 Source1: ecj.sh.in
 Source3: https://repo1.maven.org/maven2/org/eclipse/jdt/core/compiler/ecj/%{version}/ecj-%{version}.pom
-Source4: http://git.eclipse.org/c/jdt/eclipse.jdt.core.git/plain/org.eclipse.jdt.core/scripts/binary/META-INF/MANIFEST.MF
+# Extracted from https://www.eclipse.org/downloads/download.php?file=/eclipse/downloads/drops4/%{qualifier}/ecj-%{version}.jar
+Source4: MANIFEST.MF
 
 # Always generate debug info when building RPMs (Andrew Haley)
 Patch0: %{name}-rpmdebuginfo.patch
-# build.xml fails to include a necessary .props file in the built ecj.jar
-Patch1: %{name}-include-props.patch
 
 BuildArch: noarch
 
@@ -34,7 +33,6 @@ the JDT Core batch compiler.
 %prep
 %setup -q -c
 %patch0 -p1
-%patch1 -b .sav
 
 sed -i -e 's|debuglevel=\"lines,source\"|debug=\"yes\"|g' build.xml
 sed -i -e "s/Xlint:none/Xlint:none -encoding cp1252/g" build.xml
@@ -57,7 +55,7 @@ rm -f org/eclipse/jdt/core/JDTCompilerAdapter.java
 %mvn_alias org.eclipse.jdt.core.compiler:ecj \
   org.eclipse.jdt:org.eclipse.jdt.core org.eclipse.jdt:org.eclipse.jdt.compiler.apt \
   org.eclipse.tycho:org.eclipse.jdt.core org.eclipse.tycho:org.eclipse.jdt.compiler.apt \
-  org.eclipse.jetty.orbit:org.eclipse.jdt.core \
+  org.eclipse.jetty.orbit:org.eclipse.jdt.core org.eclipse.jetty.orbit:org.eclipse.jdt.compiler.apt \
   org.eclipse.jdt:core
 
 %build
@@ -70,7 +68,6 @@ gzip ecj.1
 
 # Install the ecj wrapper script
 install -p -D -m0755 %{SOURCE1} $RPM_BUILD_ROOT%{_bindir}/ecj
-sed --in-place "s:@JAVADIR@:%{_javadir}:" $RPM_BUILD_ROOT%{_bindir}/ecj
 
 # Install manpage
 mkdir -p $RPM_BUILD_ROOT%{_mandir}/man1
@@ -82,6 +79,9 @@ install -m 644 -p ecj.1.gz $RPM_BUILD_ROOT%{_mandir}/man1/ecj.1.gz
 %{_mandir}/man1/ecj.1.gz
 
 %changelog
+* Tue Oct 06 2015 Mat Booth <mat.booth@redhat.com> - 1:4.5.1-1
+- Update to Mars.1 release
+
 * Thu Jul 2 2015 Alexander Kurtakov <akurtako@redhat.com> 1:4.5-1
 - Update to upstream 4.5 release.
 
diff --git a/sources b/sources
index 9b9408b..17c5ce4 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-bb2427a9831a023d0a9ea1128ca27f8a  ecjsrc-4.5.jar
-ac89091d9516e39f94acf227abf5f192  ecj-4.5.pom
+3618a92e8628eaca8190a0e9fb576218  ecjsrc-4.5.1.jar
+864c260c4ea601a4a642abdce963d740  ecj-4.5.1.pom