diff --git a/src/RequestInterface.php b/src/RequestInterface.php
index a96d4fd..21932d9 100644
--- a/src/RequestInterface.php
+++ b/src/RequestInterface.php
@@ -53,7 +53,7 @@ public function getRequestTarget();
      * immutability of the message, and MUST return an instance that has the
      * changed request target.
      *
-     * @link http://tools.ietf.org/html/rfc7230#section-5.3 (for the various
+     * @link https://tools.ietf.org/html/rfc7230#section-5.3 (for the various
      *     request-target forms allowed in request messages)
      * @param mixed $requestTarget
      * @return static
@@ -89,7 +89,7 @@ public function withMethod($method);
      *
      * This method MUST return a UriInterface instance.
      *
-     * @link http://tools.ietf.org/html/rfc3986#section-4.3
+     * @link https://tools.ietf.org/html/rfc3986#section-4.3
      * @return UriInterface Returns a UriInterface instance
      *     representing the URI of the request.
      */
@@ -120,7 +120,7 @@ public function getUri();
      * immutability of the message, and MUST return an instance that has the
      * new UriInterface instance.
      *
-     * @link http://tools.ietf.org/html/rfc3986#section-4.3
+     * @link https://tools.ietf.org/html/rfc3986#section-4.3
      * @param UriInterface $uri New request URI to use.
      * @param bool $preserveHost Preserve the original state of the Host header.
      * @return static
diff --git a/src/ResponseInterface.php b/src/ResponseInterface.php
index c306514..78e138d 100644
--- a/src/ResponseInterface.php
+++ b/src/ResponseInterface.php
@@ -40,7 +40,7 @@ public function getStatusCode();
      * immutability of the message, and MUST return an instance that has the
      * updated status and reason phrase.
      *
-     * @link http://tools.ietf.org/html/rfc7231#section-6
+     * @link https://tools.ietf.org/html/rfc7231#section-6
      * @link http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
      * @param int $code The 3-digit integer result code to set.
      * @param string $reasonPhrase The reason phrase to use with the
@@ -60,7 +60,7 @@ public function withStatus($code, $reasonPhrase = '');
      * listed in the IANA HTTP Status Code Registry) for the response's
      * status code.
      *
-     * @link http://tools.ietf.org/html/rfc7231#section-6
+     * @link https://tools.ietf.org/html/rfc7231#section-6
      * @link http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
      * @return string Reason phrase; must return an empty string if none present.
      */
diff --git a/src/UriInterface.php b/src/UriInterface.php
index 9d7ab9e..44139c9 100644
--- a/src/UriInterface.php
+++ b/src/UriInterface.php
@@ -19,7 +19,7 @@
  * For server-side requests, the scheme will typically be discoverable in the
  * server parameters.
  *
- * @link http://tools.ietf.org/html/rfc3986 (the URI specification)
+ * @link https://tools.ietf.org/html/rfc3986 (the URI specification)
  */
 interface UriInterface
 {
@@ -84,7 +84,7 @@ public function getUserInfo();
      * The value returned MUST be normalized to lowercase, per RFC 3986
      * Section 3.2.2.
      *
-     * @see http://tools.ietf.org/html/rfc3986#section-3.2.2
+     * @see https://tools.ietf.org/html/rfc3986#section-3.2.2
      * @return string The URI host.
      */
     public function getHost();
@@ -316,7 +316,7 @@ public function withFragment($fragment);
      * - If a query is present, it MUST be prefixed by "?".
      * - If a fragment is present, it MUST be prefixed by "#".
      *
-     * @see http://tools.ietf.org/html/rfc3986#section-4.1
+     * @see https://tools.ietf.org/html/rfc3986#section-4.1
      * @return string
      */
     public function __toString();