--- a/src/pom.xml
+++ b/src/pom.xml
@@ -103,13 +103,18 @@
             </dependency>
             <dependency>
                 <groupId>org.slf4j</groupId>
+                <artifactId>slf4j-api</artifactId>
+                <version>1.6.1</version>
+            </dependency>
+            <dependency>
+                <groupId>org.slf4j</groupId>
                 <artifactId>slf4j-log4j12</artifactId>
-                <version>1.4.3</version>
+                <version>1.6.1</version>
             </dependency>
             <dependency>
                 <groupId>org.slf4j</groupId>
                 <artifactId>slf4j-simple</artifactId>
-                <version>1.4.3</version>
+                <version>1.6.1</version>
             </dependency>
             <dependency>
                 <groupId>com.jcraft</groupId>
--- a/src/sshd-core/pom.xml
+++ b/src/sshd-core/pom.xml
@@ -55,6 +55,10 @@
         </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
             <artifactId>slf4j-log4j12</artifactId>
             <scope>test</scope>
         </dependency>