diff --git a/yarn.lock b/yarn.lock
index 0f1ee98..e50917c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -212,12 +212,14 @@ asap@~2.0.3:
   resolved "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz#e50347611d7e690943208bbdafebcbc2fb866d46"
 
 asn1@~0.2.3:
-  version "0.2.3"
-  resolved "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz#dac8787713c9966849fc8180777ebe9c1ddf3b86"
+  version "0.2.4"
+  resolved "https://registry.yarnpkg.com/asn1/-/asn1-0.2.4.tgz#8d2475dfab553bb33e77b54e59e880bb8ce23136"
+  dependencies:
+    safer-buffer "~2.1.0"
 
 assert-plus@1.0.0, assert-plus@^1.0.0:
   version "1.0.0"
-  resolved "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz#f12e0f3c5d77b0b1cdd9146942e4e96c1e4dd525"
+  resolved "https://registry.yarnpkg.com/assert-plus/-/assert-plus-1.0.0.tgz#f12e0f3c5d77b0b1cdd9146942e4e96c1e4dd525"
 
 assert-plus@^0.2.0:
   version "0.2.0"
@@ -873,8 +875,8 @@ batch@0.5.3:
   resolved "https://registry.npmjs.org/batch/-/batch-0.5.3.tgz#3f3414f380321743bfc1042f9a83ff1d5824d464"
 
 bcrypt-pbkdf@^1.0.0:
-  version "1.0.1"
-  resolved "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.1.tgz#63bc5dcb61331b92bc05fd528953c33462a06f8d"
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz#a4301d389b6a43f9b67ff3ca11a3f6637e360e9e"
   dependencies:
     tweetnacl "^0.14.3"
 
@@ -1369,7 +1371,7 @@ currently-unhandled@^0.4.1:
 
 dashdash@^1.12.0:
   version "1.14.1"
-  resolved "https://registry.npmjs.org/dashdash/-/dashdash-1.14.1.tgz#853cfa0f7cbe2fed5de20326b8dd581035f6e2f0"
+  resolved "https://registry.yarnpkg.com/dashdash/-/dashdash-1.14.1.tgz#853cfa0f7cbe2fed5de20326b8dd581035f6e2f0"
   dependencies:
     assert-plus "^1.0.0"
 
@@ -1490,10 +1492,11 @@ duplexer2@0.0.2:
     readable-stream "~1.1.9"
 
 ecc-jsbn@~0.1.1:
-  version "0.1.1"
-  resolved "https://registry.npmjs.org/ecc-jsbn/-/ecc-jsbn-0.1.1.tgz#0fc73a9ed5f0d53c38193398523ef7e543777505"
+  version "0.1.2"
+  resolved "https://registry.yarnpkg.com/ecc-jsbn/-/ecc-jsbn-0.1.2.tgz#3a83a904e54353287874c564b7549386849a98c9"
   dependencies:
     jsbn "~0.1.0"
+    safer-buffer "^2.1.0"
 
 ee-first@1.1.1:
   version "1.1.1"
@@ -1953,7 +1956,7 @@ get-value@^2.0.3, get-value@^2.0.6:
 
 getpass@^0.1.1:
   version "0.1.7"
-  resolved "https://registry.npmjs.org/getpass/-/getpass-0.1.7.tgz#5eff8e3e684d569ae4cb2b1282604e8ba62149fa"
+  resolved "https://registry.yarnpkg.com/getpass/-/getpass-0.1.7.tgz#5eff8e3e684d569ae4cb2b1282604e8ba62149fa"
   dependencies:
     assert-plus "^1.0.0"
 
@@ -2579,7 +2582,7 @@ js-yaml@^3.9.0:
 
 jsbn@~0.1.0:
   version "0.1.1"
-  resolved "https://registry.npmjs.org/jsbn/-/jsbn-0.1.1.tgz#a5e654c2e5a2deb5f201d96cefbca80c0ef2f513"
+  resolved "https://registry.yarnpkg.com/jsbn/-/jsbn-0.1.1.tgz#a5e654c2e5a2deb5f201d96cefbca80c0ef2f513"
 
 jsesc@^1.3.0:
   version "1.3.0"
@@ -4095,6 +4098,10 @@ safe-buffer@~5.0.1:
   version "5.0.1"
   resolved "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.0.1.tgz#d263ca54696cd8a306b5ca6551e92de57918fbe7"
 
+safer-buffer@^2.0.2, safer-buffer@^2.1.0, safer-buffer@~2.1.0:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/safer-buffer/-/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
+
 sane@^2.0.0:
   version "2.3.0"
   resolved "https://registry.npmjs.org/sane/-/sane-2.3.0.tgz#3f3df584abf69e63d4bb74f0f8c42468e4d7d46b"
@@ -4353,17 +4360,17 @@ sprintf-js@~1.0.2:
   resolved "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
 
 sshpk@^1.7.0:
-  version "1.13.1"
-  resolved "https://registry.npmjs.org/sshpk/-/sshpk-1.13.1.tgz#512df6da6287144316dc4c18fe1cf1d940739be3"
+  version "1.16.1"
+  resolved "https://registry.yarnpkg.com/sshpk/-/sshpk-1.16.1.tgz#fb661c0bef29b39db40769ee39fa70093d6f6877"
   dependencies:
     asn1 "~0.2.3"
     assert-plus "^1.0.0"
-    dashdash "^1.12.0"
-    getpass "^0.1.1"
-  optionalDependencies:
     bcrypt-pbkdf "^1.0.0"
+    dashdash "^1.12.0"
     ecc-jsbn "~0.1.1"
+    getpass "^0.1.1"
     jsbn "~0.1.0"
+    safer-buffer "^2.0.2"
     tweetnacl "~0.14.0"
 
 stacktrace-parser@^0.1.3:
@@ -4600,7 +4607,7 @@ tunnel-agent@^0.6.0:
 
 tweetnacl@^0.14.3, tweetnacl@~0.14.0:
   version "0.14.5"
-  resolved "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz#5ae68177f192d4456269d108afa93ff8743f4f64"
+  resolved "https://registry.yarnpkg.com/tweetnacl/-/tweetnacl-0.14.5.tgz#5ae68177f192d4456269d108afa93ff8743f4f64"
 
 type-is@~1.6.6:
   version "1.6.15"