diff --git a/akka-actor/src/main/scala/akka/event/Logging.scala b/akka-actor/src/main/scala/akka/event/Logging.scala
index 4afa55e0e9..30a13c1b97 100644
--- a/akka-actor/src/main/scala/akka/event/Logging.scala
+++ b/akka-actor/src/main/scala/akka/event/Logging.scala
@@ -1579,7 +1579,7 @@ trait DiagnosticLoggingAdapter extends LoggingAdapter {
    * Scala API:
    * Mapped Diagnostic Context for application defined values
    * which can be used in PatternLayout when `akka.event.slf4j.Slf4jLogger` is configured.
-   * Visit <a href="http://logback.qos.ch/manual/mdc.html">Logback Docs: MDC</a> for more information.
+   * Visit <a href="https://logback.qos.ch/manual/mdc.html">Logback Docs: MDC</a> for more information.
    *
    * @return A Map containing the MDC values added by the application, or empty Map if no value was added.
    */
@@ -1589,7 +1589,7 @@ trait DiagnosticLoggingAdapter extends LoggingAdapter {
    * Scala API:
    * Sets the values to be added to the MDC (Mapped Diagnostic Context) before the log is appended.
    * These values can be used in PatternLayout when `akka.event.slf4j.Slf4jLogger` is configured.
-   * Visit <a href="http://logback.qos.ch/manual/mdc.html">Logback Docs: MDC</a> for more information.
+   * Visit <a href="https://logback.qos.ch/manual/mdc.html">Logback Docs: MDC</a> for more information.
    */
   def mdc(mdc: MDC): Unit = _mdc = if (mdc != null) mdc else emptyMDC
 
@@ -1597,7 +1597,7 @@ trait DiagnosticLoggingAdapter extends LoggingAdapter {
    * Java API:
    * Mapped Diagnostic Context for application defined values
    * which can be used in PatternLayout when `akka.event.slf4j.Slf4jLogger` is configured.
-   * Visit <a href="http://logback.qos.ch/manual/mdc.html">Logback Docs: MDC</a> for more information.
+   * Visit <a href="https://logback.qos.ch/manual/mdc.html">Logback Docs: MDC</a> for more information.
    * Note tha it returns a <b>COPY</b> of the actual MDC values.
    * You cannot modify any value by changing the returned Map.
    * Code like the following won't have any effect unless you set back the modified Map.
@@ -1617,7 +1617,7 @@ trait DiagnosticLoggingAdapter extends LoggingAdapter {
    * Java API:
    * Sets the values to be added to the MDC (Mapped Diagnostic Context) before the log is appended.
    * These values can be used in PatternLayout when `akka.event.slf4j.Slf4jLogger` is configured.
-   * Visit <a href="http://logback.qos.ch/manual/mdc.html">Logback Docs: MDC</a> for more information.
+   * Visit <a href="https://logback.qos.ch/manual/mdc.html">Logback Docs: MDC</a> for more information.
    */
   def setMDC(jMdc: java.util.Map[String, Any]): Unit = mdc(if (jMdc != null) jMdc.asScala.toMap else emptyMDC)
 
diff --git a/akka-actor/src/main/scala/akka/routing/MurmurHash.scala b/akka-actor/src/main/scala/akka/routing/MurmurHash.scala
index 347635d68c..919f9c1e55 100644
--- a/akka-actor/src/main/scala/akka/routing/MurmurHash.scala
+++ b/akka-actor/src/main/scala/akka/routing/MurmurHash.scala
@@ -8,7 +8,7 @@
 
 /**
  * An implementation of Austin Appleby's MurmurHash 3.0 algorithm
- *  (32 bit version); reference: http://code.google.com/p/smhasher
+ *  (32 bit version); reference: https://github.com/aappleby/smhasher
  *
  *  This is the hash used by collections and case classes (including
  *  tuples).
diff --git a/akka-actor/src/main/scala/akka/routing/TailChopping.scala b/akka-actor/src/main/scala/akka/routing/TailChopping.scala
index b8e1a0ebc3..504a48ba73 100644
--- a/akka-actor/src/main/scala/akka/routing/TailChopping.scala
+++ b/akka-actor/src/main/scala/akka/routing/TailChopping.scala
@@ -34,7 +34,7 @@ import akka.util.Timeout
  * more slowly than expected. In this case, sending the same work request (also known as a "backup request")
  * to another actor results in decreased response time - because it's less probable that multiple actors
  * are under heavy load simultaneously. This technique is explained in depth in Jeff Dean's presentation on
- * <a href="http://static.googleusercontent.com/media/research.google.com/en//people/jeff/Berkeley-Latency-Mar2012.pdf">
+ * <a href="https://static.googleusercontent.com/media/research.google.com/en//people/jeff/Berkeley-Latency-Mar2012.pdf">
  * Achieving Rapid Response Times in Large Online Services</a>.
  *
  * @param scheduler schedules sending messages to routees