diff --git a/yarn.lock b/yarn.lock
index 0a65c96..64b998e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4842,7 +4842,11 @@ rxjs@^5.4.2:
   dependencies:
     symbol-observable "1.0.1"
 
-safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.1, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
+safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.1:
+  version "5.2.1"
+  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.1.tgz#1eaf9fa9bdb1fdd4ec75f58f9cdb4e6b7827eec6"
+
+safe-buffer@~5.1.0, safe-buffer@~5.1.1:
   version "5.1.1"
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.1.tgz#893312af69b2123def71f57889001671eeb2c853"
 
@@ -5098,15 +5102,9 @@ sshpk@^1.7.0:
     jsbn "~0.1.0"
     tweetnacl "~0.14.0"
 
-ssri@^5.0.0:
-  version "5.0.0"
-  resolved "https://registry.yarnpkg.com/ssri/-/ssri-5.0.0.tgz#13c19390b606c821f2a10d02b351c1729b94d8cf"
-  dependencies:
-    safe-buffer "^5.1.0"
-
-ssri@^5.2.4:
-  version "5.2.4"
-  resolved "https://registry.yarnpkg.com/ssri/-/ssri-5.2.4.tgz#9985e14041e65fc397af96542be35724ac11da52"
+ssri@^5.0.0, ssri@^5.2.4:
+  version "5.3.0"
+  resolved "https://registry.yarnpkg.com/ssri/-/ssri-5.3.0.tgz#ba3872c9c6d33a0704a7d71ff045e5ec48999d06"
   dependencies:
     safe-buffer "^5.1.1"