diff --git a/integration/src/IBUNDLE-META-INF/MANIFEST.MF b/integration/src/IBUNDLE-META-INF/MANIFEST.MF
index 2142088a..f7f1d5d3 100644
--- a/integration/src/IBUNDLE-META-INF/MANIFEST.MF
+++ b/integration/src/IBUNDLE-META-INF/MANIFEST.MF
@@ -10,6 +10,6 @@ Implementation-Title: iBundle
 Bundle-ManifestVersion: 2
 Bundle-SymbolicName: iBundle
 Bundle-Name: abundle
-Bundle-RequiredExecutionEnvironment: J2SE-1.6
+Bundle-RequiredExecutionEnvironment: JavaSE-1.6
 Export-Package: apack
 Import-Package: org.osgi.framework, org.slf4j;version=1.5
\ No newline at end of file
diff --git a/jcl-over-slf4j/src/main/resources/META-INF/MANIFEST.MF b/jcl-over-slf4j/src/main/resources/META-INF/MANIFEST.MF
index bb1d43e4..a9f06fd5 100755
--- a/jcl-over-slf4j/src/main/resources/META-INF/MANIFEST.MF
+++ b/jcl-over-slf4j/src/main/resources/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@ Bundle-ManifestVersion: 2
 Bundle-SymbolicName: jcl.over.slf4j
 Bundle-Name: jcl-over-slf4j
 Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: J2SE-1.5
+Bundle-RequiredExecutionEnvironment: JavaSE-1.6
 Export-Package: org.apache.commons.logging;version=1.2, 
   org.apache.commons.logging.impl;version=1.2
 Import-Package: org.slf4j;version=${parsedVersion.osgiVersion}, org.slf4j.spi;version=${parsedVersion.osgiVersion}
diff --git a/jul-to-slf4j/src/main/resources/META-INF/MANIFEST.MF b/jul-to-slf4j/src/main/resources/META-INF/MANIFEST.MF
index 6e4ed9ee..d4f9ffb9 100644
--- a/jul-to-slf4j/src/main/resources/META-INF/MANIFEST.MF
+++ b/jul-to-slf4j/src/main/resources/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Bundle-ManifestVersion: 2
 Bundle-SymbolicName: jul.to.slf4j
 Bundle-Name: jul-to-slf4j
 Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: J2SE-1.5
+Bundle-RequiredExecutionEnvironment: JavaSE-1.6
 Export-Package: org.slf4j.bridge;version=${parsedVersion.osgiVersion};uses:="org.slf4j,org.slf4j.spi"
 Import-Package: org.slf4j;version=${parsedVersion.osgiVersion},org.slf4j.spi;version=${parsedVersion.osgiVersion}
 Automatic-Module-Name: jul.to.slf4j
diff --git a/log4j-over-slf4j/src/main/resources/META-INF/MANIFEST.MF b/log4j-over-slf4j/src/main/resources/META-INF/MANIFEST.MF
index b63540aa..9518f15f 100755
--- a/log4j-over-slf4j/src/main/resources/META-INF/MANIFEST.MF
+++ b/log4j-over-slf4j/src/main/resources/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@ Bundle-ManifestVersion: 2
 Bundle-SymbolicName: log4j.over.slf4j
 Bundle-Name: log4j-over-slf4j
 Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: J2SE-1.5
+Bundle-RequiredExecutionEnvironment: JavaSE-1.6
 Export-Package: org.apache.log4j;version=${log4j.version},
  org.apache.log4j.helpers;version=${log4j.version},
  org.apache.log4j.spi;version=${log4j.version},
diff --git a/osgi-over-slf4j/src/main/resources/META-INF/MANIFEST.MF b/osgi-over-slf4j/src/main/resources/META-INF/MANIFEST.MF
index 73cebcfc..ce04dd8b 100644
--- a/osgi-over-slf4j/src/main/resources/META-INF/MANIFEST.MF
+++ b/osgi-over-slf4j/src/main/resources/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Implementation-Title: osgi-over-slf4j
 Bundle-ManifestVersion: 2
 Bundle-SymbolicName: org.slf4j.osgi-over-slf4j
 Bundle-Name: OSGi LogService implemented over SLF4J
-Bundle-RequiredExecutionEnvironment: J2SE-1.5
+Bundle-RequiredExecutionEnvironment: JavaSE-1.6
 Bundle-Activator: org.slf4j.osgi.logservice.impl.Activator
 Bundle-Category: osgi
 Import-Package: org.osgi.framework;version="[1.5,2)",org.osgi.service.log;version="[1.3,2)",org.slf4j;version=${parsedVersion.osgiVersion}
diff --git a/slf4j-ext/src/main/resources/META-INF/MANIFEST.MF b/slf4j-ext/src/main/resources/META-INF/MANIFEST.MF
index aee11701..3a3d458e 100644
--- a/slf4j-ext/src/main/resources/META-INF/MANIFEST.MF
+++ b/slf4j-ext/src/main/resources/META-INF/MANIFEST.MF
@@ -3,6 +3,6 @@ Bundle-ManifestVersion: 2
 Bundle-SymbolicName: slf4j.ext
 Bundle-Name: slf4j-ext
 Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: J2SE-1.5
+Bundle-RequiredExecutionEnvironment: JavaSE-1.6
 Export-Package: org.slf4j.profiler;version=${parsedVersion.osgiVersion}, org.slf4j.cal10n;version=${parsedVersion.osgiVersion}, org.slf4j.ext;version=${parsedVersion.osgiVersion}
 Import-Package: org.slf4j;version=${parsedVersion.osgiVersion}, org.slf4j.spi;version=${parsedVersion.osgiVersion}, org.slf4j.helpers;version=${parsedVersion.osgiVersion}, ch.qos.cal10n;version=${cal10n.version};resolution:=optional
diff --git a/slf4j-jdk14/src/main/resources/META-INF/MANIFEST.MF b/slf4j-jdk14/src/main/resources/META-INF/MANIFEST.MF
index 602207f1..7251f31f 100755
--- a/slf4j-jdk14/src/main/resources/META-INF/MANIFEST.MF
+++ b/slf4j-jdk14/src/main/resources/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@ Bundle-ManifestVersion: 2
 Bundle-SymbolicName: slf4j.jdk14
 Bundle-Name: slf4j-jdk14
 Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: J2SE-1.5
+Bundle-RequiredExecutionEnvironment: JavaSE-1.6
 Export-Package: org.slf4j.jul;version=${parsedVersion.osgiVersion}
 Import-Package: org.slf4j;version=${parsedVersion.osgiVersion},
  org.slf4j.spi;version=${parsedVersion.osgiVersion},
diff --git a/slf4j-log4j12/src/main/resources/META-INF/MANIFEST.MF b/slf4j-log4j12/src/main/resources/META-INF/MANIFEST.MF
index fd9cfb24..9f7c363e 100755
--- a/slf4j-log4j12/src/main/resources/META-INF/MANIFEST.MF
+++ b/slf4j-log4j12/src/main/resources/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@ Bundle-ManifestVersion: 2
 Bundle-SymbolicName: slf4j.log4j12
 Bundle-Name: slf4j-log4j12
 Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: J2SE-1.5
+Bundle-RequiredExecutionEnvironment: JavaSE-1.6
 Export-Package: org.slf4j.log4j12;version=${parsedVersion.osgiVersion}
 Import-Package: org.slf4j;version=${parsedVersion.osgiVersion},
  org.slf4j.spi;version=${parsedVersion.osgiVersion},
diff --git a/slf4j-nop/src/main/resources/META-INF/MANIFEST.MF b/slf4j-nop/src/main/resources/META-INF/MANIFEST.MF
index f6e9dd48..73dc3c1c 100755
--- a/slf4j-nop/src/main/resources/META-INF/MANIFEST.MF
+++ b/slf4j-nop/src/main/resources/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@ Bundle-ManifestVersion: 2
 Bundle-SymbolicName: slf4j.nop
 Bundle-Name: slf4j-nop
 Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: J2SE-1.5
+Bundle-RequiredExecutionEnvironment: JavaSE-1.6
 Export-Package: org.slf4j.nop;version=${parsedVersion.osgiVersion}
 Import-Package: org.slf4j;version=${parsedVersion.osgiVersion},
  org.slf4j.spi;version=${parsedVersion.osgiVersion},
diff --git a/slf4j-simple/src/main/resources/META-INF/MANIFEST.MF b/slf4j-simple/src/main/resources/META-INF/MANIFEST.MF
index 7c1942a9..6b95a08a 100755
--- a/slf4j-simple/src/main/resources/META-INF/MANIFEST.MF
+++ b/slf4j-simple/src/main/resources/META-INF/MANIFEST.MF
@@ -4,7 +4,7 @@ Bundle-SymbolicName: slf4j.simple
 Bundle-Name: slf4j-simple
 Bundle-Vendor: SLF4J.ORG
 Require-Bundle: slf4j.api
-Bundle-RequiredExecutionEnvironment: J2SE-1.5
+Bundle-RequiredExecutionEnvironment: JavaSE-1.6
 Export-Package: org.slf4j.simple;version=${parsedVersion.osgiVersion}
 Import-Package: org.slf4j;version=${parsedVersion.osgiVersion},
  org.slf4j.spi;version=${parsedVersion.osgiVersion},
diff --git a/slf4j-site/src/site/pages/news.html b/slf4j-site/src/site/pages/news.html
index 3b443d7e..049c3c84 100755
--- a/slf4j-site/src/site/pages/news.html
+++ b/slf4j-site/src/site/pages/news.html
@@ -48,6 +48,18 @@
    <a href="https://jira.qos.ch/browse/SLF4J-233">SLF4J-233</a> by
    John Vasileff.</p>
 
+   <p>In all relevant <em>MANIFEST.MF</em> files set the
+   <code>Bundle-RequiredExecutionEnvironment</code> directive to
+   <code>JavaSE-1.6</code>. This fixes <a
+   href="https://jira.qos.ch/browse/SLF4J-449">SLF4J-449</a> as
+   reported by  Larissa Smirnova.</p>
+
+   pdated the entry and corrected an issue loading slf4j with an
+   improper or unexpected execution environment <b
+   class="red">J2SE-1.6</b>, so changed the
+   Bundle-RequiredExecutionEnvironment from J2SE-1.6 to
+   <b>JavaSE-1.6</b>.
+   
    <p>In the slf4j-ext package, marked the ch.qos.cal10n package as
    optional. This fixes <a
    href="https://jira.qos.ch/browse/SLF4J-439">SLF4J-439</a> reported