diff --git a/samples/sfu-server/yarn.lock b/samples/sfu-server/yarn.lock
index a735794..ad2cd78 100644
--- a/samples/sfu-server/yarn.lock
+++ b/samples/sfu-server/yarn.lock
@@ -13,12 +13,12 @@ any-promise@^1.0.0, any-promise@^1.1.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/any-promise/-/any-promise-1.3.0.tgz#abc6afeedcea52e809cdc0376aed3ce39635d17f"
 
-axios@0.18.0:
-  version "0.18.0"
-  resolved "http://registry.npmjs.org/axios/-/axios-0.18.0.tgz#32d53e4851efdc0a11993b6cd000789d70c05102"
+axios@0.19.0:
+  version "0.19.0"
+  resolved "https://registry.yarnpkg.com/axios/-/axios-0.19.0.tgz#8e09bff3d9122e133f7b8101c8fbdd00ed3d2ab8"
   dependencies:
-    follow-redirects "^1.3.0"
-    is-buffer "^1.1.5"
+    follow-redirects "1.5.10"
+    is-buffer "^2.0.2"
 
 bytes@3.0.0:
   version "3.0.0"
@@ -109,9 +109,9 @@ escape-html@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/escape-html/-/escape-html-1.0.3.tgz#0258eae4d3d0c0974de1c169188ef0051d1d1988"
 
-follow-redirects@^1.3.0:
-  version "1.5.9"
-  resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.5.9.tgz#c9ed9d748b814a39535716e531b9196a845d89c6"
+follow-redirects@1.5.10:
+  version "1.5.10"
+  resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.5.10.tgz#7b7a9f9aea2fdff36786a94ff643ed07f4ff5e2a"
   dependencies:
     debug "=3.1.0"
 
@@ -128,7 +128,7 @@ http-assert@^1.3.0:
 
 http-errors@1.6.3, http-errors@~1.6.2:
   version "1.6.3"
-  resolved "http://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz#8b55680bb4be283a0b5bf4ea2e38580be1d9320d"
+  resolved "https://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz#8b55680bb4be283a0b5bf4ea2e38580be1d9320d"
   dependencies:
     depd "~1.1.2"
     inherits "2.0.3"
@@ -159,9 +159,9 @@ inherits@2.0.3:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
 
-is-buffer@^1.1.5:
-  version "1.1.6"
-  resolved "https://registry.yarnpkg.com/is-buffer/-/is-buffer-1.1.6.tgz#efaa2ea9daa0d7ab2ea13a97b2b8ad51fefbe8be"
+is-buffer@^2.0.2:
+  version "2.0.5"
+  resolved "https://registry.yarnpkg.com/is-buffer/-/is-buffer-2.0.5.tgz#ebc252e400d22ff8d77fa09888821a24a658c191"
 
 is-generator-function@^1.0.7:
   version "1.0.7"
@@ -238,9 +238,9 @@ koa-send@4.1.1:
     mz "^2.6.0"
     resolve-path "^1.3.3"
 
-koa@2.5.3:
-  version "2.5.3"
-  resolved "https://registry.yarnpkg.com/koa/-/koa-2.5.3.tgz#0b0c37eee3aac807a0a6ad36bc0b8660f12d83f1"
+koa@2.7.0:
+  version "2.7.0"
+  resolved "https://registry.yarnpkg.com/koa/-/koa-2.7.0.tgz#7e00843506942b9d82c6cc33749f657c6e5e7adf"
   dependencies:
     accepts "^1.3.5"
     cache-content-type "^1.0.0"
@@ -393,8 +393,8 @@ unpipe@1.0.0:
   resolved "https://registry.yarnpkg.com/unpipe/-/unpipe-1.0.0.tgz#b2bf4ee8514aae6165b4817829d21b2ef49904ec"
 
 urijs@^1.19.0:
-  version "1.19.1"
-  resolved "https://registry.yarnpkg.com/urijs/-/urijs-1.19.1.tgz#5b0ff530c0cbde8386f6342235ba5ca6e995d25a"
+  version "1.19.11"
+  resolved "https://registry.yarnpkg.com/urijs/-/urijs-1.19.11.tgz#204b0d6b605ae80bea54bea39280cdb7c9f923cc"
 
 vary@^1.1.2:
   version "1.1.2"