diff --git a/pom.xml b/pom.xml
index d7242ea3..4e216b15 100644
--- a/pom.xml
+++ b/pom.xml
@@ -457,6 +457,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
             <artifactId>maven-javadoc-plugin</artifactId>
             <configuration>
               <failOnError>true</failOnError>
+              <source>8</source>
               <quiet>true</quiet>
               <links>
                 <link>http://download.oracle.com/javaee/6/api/</link>
@@ -1095,7 +1096,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>com.jcabi</groupId>
         <artifactId>jcabi-dynamo</artifactId>
-        <version>0.21.4</version>
+        <version>0.21.5</version>
       </dependency>
       <dependency>
         <!--
@@ -1113,7 +1114,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>com.jcabi</groupId>
         <artifactId>jcabi-github</artifactId>
-        <version>0.33</version>
+        <version>0.33.1</version>
       </dependency>
       <dependency>
         <!--
@@ -1122,7 +1123,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>com.jcabi</groupId>
         <artifactId>jcabi-http</artifactId>
-        <version>1.17.1</version>
+        <version>1.17.2</version>
       </dependency>
       <dependency>
         <!--
@@ -1140,7 +1141,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>com.jcabi</groupId>
         <artifactId>jcabi-jdbc</artifactId>
-        <version>0.16</version>
+        <version>0.17</version>
       </dependency>
       <dependency>
         <!--
@@ -1149,7 +1150,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>com.jcabi</groupId>
         <artifactId>jcabi-log</artifactId>
-        <version>0.17.2</version>
+        <version>0.17.3</version>
       </dependency>
       <dependency>
         <!--
@@ -1194,7 +1195,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>com.jcabi</groupId>
         <artifactId>jcabi-s3</artifactId>
-        <version>0.17.1</version>
+        <version>0.18</version>
       </dependency>
       <dependency>
         <!--
@@ -1212,7 +1213,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>com.jcabi</groupId>
         <artifactId>jcabi-ssh</artifactId>
-        <version>1.6</version>
+        <version>1.6.1</version>
       </dependency>
       <dependency>
         <!--
@@ -1248,20 +1249,20 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>com.jcabi</groupId>
         <artifactId>jcabi-xml</artifactId>
-        <version>0.20.1</version>
+        <version>0.21</version>
       </dependency>
       <dependency>
         <!-- JSON API -->
         <groupId>javax.json</groupId>
         <artifactId>javax.json-api</artifactId>
-        <version>1.1</version>
+        <version>1.1.2</version>
         <scope>provided</scope>
       </dependency>
       <dependency>
         <!-- JSON reference implementation -->
         <groupId>org.glassfish</groupId>
         <artifactId>javax.json</artifactId>
-        <version>1.1</version>
+        <version>1.1.2</version>
         <scope>runtime</scope>
       </dependency>
       <dependency>
@@ -1275,7 +1276,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         <!-- JAXB API -->
         <groupId>javax.xml.bind</groupId>
         <artifactId>jaxb-api</artifactId>
-        <version>2.3.0</version>
+        <version>2.3.1</version>
         <exclusions>
           <exclusion>
             <groupId>javax.xml.bind</groupId>
@@ -1290,7 +1291,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>com.google.guava</groupId>
         <artifactId>guava</artifactId>
-        <version>20.0</version>
+        <version>21.0-rc1</version>
       </dependency>
       <dependency>
         <!--
@@ -1299,7 +1300,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>org.apache.commons</groupId>
         <artifactId>commons-lang3</artifactId>
-        <version>3.6</version>
+        <version>3.7</version>
       </dependency>
       <dependency>
         <!--
@@ -1308,7 +1309,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>org.apache.commons</groupId>
         <artifactId>commons-text</artifactId>
-        <version>1.1</version>
+        <version>1.2</version>
       </dependency>
       <dependency>
         <!--
@@ -1317,7 +1318,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>org.apache.commons</groupId>
         <artifactId>commons-collections4</artifactId>
-        <version>4.1</version>
+        <version>4.2</version>
       </dependency>
       <dependency>
         <!--
@@ -1335,7 +1336,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>commons-codec</groupId>
         <artifactId>commons-codec</artifactId>
-        <version>1.10</version>
+        <version>1.11</version>
       </dependency>
       <dependency>
         <!--
@@ -1353,7 +1354,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>commons-io</groupId>
         <artifactId>commons-io</artifactId>
-        <version>2.5</version>
+        <version>2.6</version>
       </dependency>
       <dependency>
         <!--
@@ -1361,7 +1362,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>org.aspectj</groupId>
         <artifactId>aspectjrt</artifactId>
-        <version>1.8.11</version>
+        <version>1.8.12</version>
       </dependency>
       <dependency>
         <!--
@@ -1369,7 +1370,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>javax.validation</groupId>
         <artifactId>validation-api</artifactId>
-        <version>2.0.0.Final</version>
+        <version>2.0.1.Final</version>
       </dependency>
       <dependency>
         <!--
@@ -1377,19 +1378,19 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>org.hibernate.validator</groupId>
         <artifactId>hibernate-validator</artifactId>
-        <version>6.1.0.Final</version>
+        <version>6.1.1.Final</version>
       </dependency>
       <dependency>
         <!-- Required for Hibernate validator -->
         <groupId>javax.el</groupId>
         <artifactId>javax.el-api</artifactId>
-        <version>3.0.1-b04</version>
+        <version>3.0.1-b06</version>
       </dependency>
       <dependency>
         <!-- Clojure -->
         <groupId>org.clojure</groupId>
         <artifactId>clojure</artifactId>
-        <version>1.9.0-beta1</version>
+        <version>1.9.0-beta2</version>
       </dependency>
       <dependency>
         <!-- Clojure -->
@@ -1401,13 +1402,13 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         <!-- Clojure -->
         <groupId>org.clojure</groupId>
         <artifactId>tools.logging</artifactId>
-        <version>0.4.0</version>
+        <version>0.4.1</version>
       </dependency>
       <dependency>
         <!-- Servlet API -->
         <groupId>javax.servlet</groupId>
         <artifactId>javax.servlet-api</artifactId>
-        <version>4.0.0</version>
+        <version>4.0.1</version>
         <scope>provided</scope>
       </dependency>
       <dependency>
@@ -1417,7 +1418,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>org.projectlombok</groupId>
         <artifactId>lombok</artifactId>
-        <version>1.18.8</version>
+        <version>1.18.10</version>
         <scope>provided</scope>
       </dependency>
       <dependency>
@@ -1428,7 +1429,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         you explicitly check it in Maven Central. Version 2.0.2 is published
         there, but it's outdated (June 2007), while 1.4.01 is the latest.
         -->
-        <version>1.4.01</version>
+        <version>2.0.0</version>
         <!-- don't change this line, 1.4.01 is the right/latest version -->
       </dependency>
       <dependency>
@@ -1451,7 +1452,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>org.hamcrest</groupId>
         <artifactId>hamcrest</artifactId>
-        <version>2.1</version>
+        <version>2.2-rc1</version>
       </dependency>
       <dependency>
         <!--
@@ -1461,7 +1462,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         -->
         <groupId>org.mockito</groupId>
         <artifactId>mockito-core</artifactId>
-        <version>2.10.0</version>
+        <version>2.11.0</version>
         <exclusions>
           <exclusion>
             <groupId>org.hamcrest</groupId>
@@ -1473,7 +1474,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         <!-- Forward all SLF4J calls to LOG4J. -->
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-log4j12</artifactId>
-        <version>1.8.0-alpha2</version>
+        <version>1.8.0-beta0</version>
       </dependency>
       <dependency>
         <!-- Use LOG4J logging facility for all loggings. -->
@@ -1493,12 +1494,12 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
       <dependency>
         <groupId>org.antlr</groupId>
         <artifactId>antlr4-runtime</artifactId>
-        <version>4.7.2</version>
+        <version>4.8</version>
       </dependency>
       <dependency>
         <groupId>org.codehaus.groovy</groupId>
         <artifactId>groovy-all</artifactId>
-        <version>2.6.0-alpha-1</version>
+        <version>2.6.0-alpha-2</version>
       </dependency>
     </dependencies>
   </dependencyManagement>
@@ -1732,7 +1733,20 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
         </plugin>
         <plugin>
           <artifactId>maven-javadoc-plugin</artifactId>
-          <version>2.10.4</version>
+          <version>3.2.0</version>
+          <configuration>
+            <source>8</source>
+            <tags>
+              <tag>
+                <name>todo</name>
+                <placement>X</placement>
+              </tag>
+              <tag>
+                <name>checkstyle</name>
+                <placement>X</placement>
+              </tag>
+            </tags>
+          </configuration>
         </plugin>
         <plugin>
           <artifactId>maven-plugin-plugin</artifactId>