diff --git a/build.xml b/build.xml
index a9a428306..4ce7b4807 100644
--- a/build.xml
+++ b/build.xml
@@ -191,7 +191,7 @@
     	<pathelement location="${lib}/jaudiotagger-2.0.4-20111207.115108-15.jar" />
         <pathelement location="${lib}/javax.servlet-api-3.1.0.jar" />
     	<pathelement location="${lib}/jcifs-1.3.17.jar" />
-    	<pathelement location="${lib}/jcl-over-slf4j-1.7.16.jar" />
+    	<pathelement location="${lib}/jcl-over-slf4j-1.7.18.jar" />
     	<pathelement location="${lib}/jempbox-1.8.11.jar" />
         <pathelement location="${lib}/jetty-client-9.2.15.v20160210.jar" />
         <pathelement location="${lib}/jetty-continuation-9.2.15.v20160210.jar" />
@@ -210,7 +210,7 @@
     	<pathelement location="${lib}/jsch-0.1.53.jar" />
     	<pathelement location="${lib}/json-simple-1.1.1.jar" />
     	<pathelement location="${lib}/jsoup-1.8.3.jar" />
-    	<pathelement location="${lib}/log4j-over-slf4j-1.7.16.jar" />
+    	<pathelement location="${lib}/log4j-over-slf4j-1.7.18.jar" />
     	<pathelement location="${lib}/lucene-analyzers-common-5.5.0.jar" />
     	<pathelement location="${lib}/lucene-analyzers-phonetic-5.5.0.jar" />
     	<pathelement location="${lib}/lucene-backward-codecs-5.5.0.jar" />
@@ -235,8 +235,8 @@
         <pathelement location="${lib}/pdfbox-1.8.11.jar" />
     	<pathelement location="${lib}/poi-3.13-20150929.jar" />
     	<pathelement location="${lib}/poi-scratchpad-3.13-20150929.jar" />
-        <pathelement location="${lib}/slf4j-api-1.7.16.jar" />
-        <pathelement location="${lib}/slf4j-jdk14-1.7.16.jar" />
+        <pathelement location="${lib}/slf4j-api-1.7.18.jar" />
+        <pathelement location="${lib}/slf4j-jdk14-1.7.18.jar" />
         <pathelement location="${lib}/solr-core-5.5.0.jar" />
         <pathelement location="${lib}/solr-solrj-5.5.0.jar" />
     	<pathelement location="${lib}/spatial4j-0.5.jar" />
diff --git a/lib/jcl-over-slf4j-1.7.16.jar b/lib/jcl-over-slf4j-1.7.18.jar
similarity index 78%
rename from lib/jcl-over-slf4j-1.7.16.jar
rename to lib/jcl-over-slf4j-1.7.18.jar
index 28dff62a1..8b6130eec 100644
Binary files a/lib/jcl-over-slf4j-1.7.16.jar and b/lib/jcl-over-slf4j-1.7.18.jar differ
diff --git a/lib/log4j-over-slf4j-1.7.16.jar b/lib/log4j-over-slf4j-1.7.18.jar
similarity index 74%
rename from lib/log4j-over-slf4j-1.7.16.jar
rename to lib/log4j-over-slf4j-1.7.18.jar
index 675197119..565eb61ea 100644
Binary files a/lib/log4j-over-slf4j-1.7.16.jar and b/lib/log4j-over-slf4j-1.7.18.jar differ
diff --git a/lib/slf4j-api-1.7.16.jar b/lib/slf4j-api-1.7.16.jar
deleted file mode 100644
index 35c94e0c3..000000000
Binary files a/lib/slf4j-api-1.7.16.jar and /dev/null differ
diff --git a/lib/slf4j-api-1.7.18.jar b/lib/slf4j-api-1.7.18.jar
new file mode 100644
index 000000000..acf68c0b6
Binary files /dev/null and b/lib/slf4j-api-1.7.18.jar differ
diff --git a/lib/slf4j-jdk14-1.7.16.jar b/lib/slf4j-jdk14-1.7.18.jar
similarity index 72%
rename from lib/slf4j-jdk14-1.7.16.jar
rename to lib/slf4j-jdk14-1.7.18.jar
index 77c8704b3..66dd08943 100644
Binary files a/lib/slf4j-jdk14-1.7.16.jar and b/lib/slf4j-jdk14-1.7.18.jar differ
diff --git a/nbproject/project.xml b/nbproject/project.xml
index e9db1e837..60dd77e70 100644
--- a/nbproject/project.xml
+++ b/nbproject/project.xml
@@ -83,7 +83,7 @@
             <compilation-unit>
                 <package-root>source</package-root>
                 <package-root>htroot</package-root>
-                <classpath mode="compile">lib/J7Zip-modified.jar;lib/apache-mime4j-0.6.jar;lib/bcmail-jdk15-1.46.jar;lib/bcprov-jdk15-1.46.jar;lib/chardet.jar;lib/common-image-3.2.1.jar;lib/common-io-3.2.1.jar;lib/common-lang-3.2.1.jar;lib/commons-codec-1.10.jar;lib/commons-compress-1.10.jar;lib/commons-fileupload-1.3.1.jar;lib/commons-io-2.4.jar;lib/commons-jxpath-1.3.jar;lib/commons-lang-2.6.jar;lib/commons-logging-1.2.jar;lib/fontbox-1.8.11.jar;lib/guava-18.0.jar;lib/htmllexer.jar;lib/httpclient-4.5.2.jar;lib/httpcore-4.4.4.jar;lib/httpmime-4.5.2.jar;lib/icu4j-56_1.jar;lib/imageio-bmp-3.2.1.jar;lib/imageio-core-3.2.1.jar;lib/imageio-metadata-3.2.1.jar;lib/imageio-tiff-3.2.1.jar;lib/jakarta-oro-2.0.8.jar;lib/jaudiotagger-2.0.4-20111207.115108-15.jar;lib/javax.servlet-api-3.1.0.jar;lib/jcifs-1.3.17.jar;lib/jcl-over-slf4j-1.7.16.jar;lib/jempbox-1.8.11.jar;lib/jetty-client-9.2.15.v20160210.jar;lib/jetty-continuation-9.2.15.v20160210.jar;lib/jetty-deploy-9.2.15.v20160210.jar;lib/jetty-http-9.2.15.v20160210.jar;lib/jetty-io-9.2.15.v20160210.jar;lib/jetty-jmx-9.2.15.v20160210.jar;lib/jetty-proxy-9.2.15.v20160210.jar;lib/jetty-security-9.2.15.v20160210.jar;lib/jetty-server-9.2.15.v20160210.jar;lib/jetty-servlet-9.2.15.v20160210.jar;lib/jetty-servlets-9.2.15.v20160210.jar;lib/jetty-util-9.2.15.v20160210.jar;lib/jetty-webapp-9.2.15.v20160210.jar;lib/jetty-xml-9.2.15.v20160210.jar;lib/jsch-0.1.53.jar;lib/json-simple-1.1.1.jar;lib/jsonic-1.2.0.jar;lib/jsoup-1.8.3.jar;lib/langdetect.jar;lib/log4j-over-slf4j-1.7.16.jar;lib/lucene-analyzers-common-5.5.0.jar;lib/lucene-analyzers-phonetic-5.5.0.jar;lib/lucene-backward-codecs-5.5.0.jar;lib/lucene-classification-5.5.0.jar;lib/lucene-codecs-5.5.0.jar;lib/lucene-core-5.5.0.jar;lib/lucene-facet-5.5.0.jar;lib/lucene-grouping-5.5.0.jar;lib/lucene-highlighter-5.5.0.jar;lib/lucene-join-5.5.0.jar;lib/lucene-memory-5.5.0.jar;lib/lucene-misc-5.5.0.jar;lib/lucene-queries-5.5.0.jar;lib/lucene-queryparser-5.5.0.jar;lib/lucene-spatial-5.5.0.jar;lib/lucene-suggest-5.5.0.jar;lib/metadata-extractor-2.8.1.jar;lib/noggit-0.6.jar;lib/org.restlet.jar;lib/pdfbox-1.8.11.jar;lib/poi-3.13-20150929.jar;lib/poi-scratchpad-3.13-20150929.jar;lib/slf4j-api-1.7.16.jar;lib/slf4j-jdk14-1.7.16.jar;lib/solr-core-5.5.0.jar;lib/solr-solrj-5.5.0.jar;lib/spatial4j-0.5.jar;lib/stax2-api-3.1.4.jar;lib/webcat-swf-0.1.jar;lib/weupnp-0.1.4.jar;lib/woodstox-core-asl-4.4.1.jar;lib/xercesImpl.jar;lib/xml-apis.jar;lib/xmpcore-5.1.2.jar;lib/zookeeper-3.4.6.jar</classpath>
+                <classpath mode="compile">lib/J7Zip-modified.jar;lib/apache-mime4j-0.6.jar;lib/bcmail-jdk15-1.46.jar;lib/bcprov-jdk15-1.46.jar;lib/chardet.jar;lib/common-image-3.2.1.jar;lib/common-io-3.2.1.jar;lib/common-lang-3.2.1.jar;lib/commons-codec-1.10.jar;lib/commons-compress-1.10.jar;lib/commons-fileupload-1.3.1.jar;lib/commons-io-2.4.jar;lib/commons-jxpath-1.3.jar;lib/commons-lang-2.6.jar;lib/commons-logging-1.2.jar;lib/fontbox-1.8.11.jar;lib/guava-18.0.jar;lib/htmllexer.jar;lib/httpclient-4.5.2.jar;lib/httpcore-4.4.4.jar;lib/httpmime-4.5.2.jar;lib/icu4j-56_1.jar;lib/imageio-bmp-3.2.1.jar;lib/imageio-core-3.2.1.jar;lib/imageio-metadata-3.2.1.jar;lib/imageio-tiff-3.2.1.jar;lib/jakarta-oro-2.0.8.jar;lib/jaudiotagger-2.0.4-20111207.115108-15.jar;lib/javax.servlet-api-3.1.0.jar;lib/jcifs-1.3.17.jar;lib/jcl-over-slf4j-1.7.18.jar;lib/jempbox-1.8.11.jar;lib/jetty-client-9.2.15.v20160210.jar;lib/jetty-continuation-9.2.15.v20160210.jar;lib/jetty-deploy-9.2.15.v20160210.jar;lib/jetty-http-9.2.15.v20160210.jar;lib/jetty-io-9.2.15.v20160210.jar;lib/jetty-jmx-9.2.15.v20160210.jar;lib/jetty-proxy-9.2.15.v20160210.jar;lib/jetty-security-9.2.15.v20160210.jar;lib/jetty-server-9.2.15.v20160210.jar;lib/jetty-servlet-9.2.15.v20160210.jar;lib/jetty-servlets-9.2.15.v20160210.jar;lib/jetty-util-9.2.15.v20160210.jar;lib/jetty-webapp-9.2.15.v20160210.jar;lib/jetty-xml-9.2.15.v20160210.jar;lib/jsch-0.1.53.jar;lib/json-simple-1.1.1.jar;lib/jsonic-1.2.0.jar;lib/jsoup-1.8.3.jar;lib/langdetect.jar;lib/log4j-over-slf4j-1.7.18.jar;lib/lucene-analyzers-common-5.5.0.jar;lib/lucene-analyzers-phonetic-5.5.0.jar;lib/lucene-backward-codecs-5.5.0.jar;lib/lucene-classification-5.5.0.jar;lib/lucene-codecs-5.5.0.jar;lib/lucene-core-5.5.0.jar;lib/lucene-facet-5.5.0.jar;lib/lucene-grouping-5.5.0.jar;lib/lucene-highlighter-5.5.0.jar;lib/lucene-join-5.5.0.jar;lib/lucene-memory-5.5.0.jar;lib/lucene-misc-5.5.0.jar;lib/lucene-queries-5.5.0.jar;lib/lucene-queryparser-5.5.0.jar;lib/lucene-spatial-5.5.0.jar;lib/lucene-suggest-5.5.0.jar;lib/metadata-extractor-2.8.1.jar;lib/noggit-0.6.jar;lib/org.restlet.jar;lib/pdfbox-1.8.11.jar;lib/poi-3.13-20150929.jar;lib/poi-scratchpad-3.13-20150929.jar;lib/slf4j-api-1.7.18.jar;lib/slf4j-jdk14-1.7.18.jar;lib/solr-core-5.5.0.jar;lib/solr-solrj-5.5.0.jar;lib/spatial4j-0.5.jar;lib/stax2-api-3.1.4.jar;lib/webcat-swf-0.1.jar;lib/weupnp-0.1.4.jar;lib/woodstox-core-asl-4.4.1.jar;lib/xercesImpl.jar;lib/xml-apis.jar;lib/xmpcore-5.1.2.jar;lib/zookeeper-3.4.6.jar</classpath>
                 <built-to>lib/yacycore.jar</built-to>
                 <source-level>1.7</source-level>
             </compilation-unit>
diff --git a/pom.xml b/pom.xml
index da213333b..ad45ca439 100644
--- a/pom.xml
+++ b/pom.xml
@@ -417,7 +417,7 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>jcl-over-slf4j</artifactId>
-            <version>1.7.16</version>
+            <version>1.7.18</version>
         </dependency>
         <dependency>
             <groupId>org.apache.pdfbox</groupId>
@@ -447,7 +447,7 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>log4j-over-slf4j</artifactId>
-            <version>1.7.16</version>
+            <version>1.7.18</version>
         </dependency>
         <dependency>
             <groupId>org.apache.lucene</groupId>
@@ -484,16 +484,6 @@
             <artifactId>sax</artifactId>
             <version>2.0.1</version>
         </dependency>        
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>slf4j-api</artifactId>
-            <version>1.7.16</version>
-        </dependency>
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>slf4j-jdk14</artifactId>
-            <version>1.7.16</version>
-        </dependency>
         <dependency>
             <groupId>org.apache.solr</groupId>
             <artifactId>solr-solrj</artifactId>