diff --git a/yarn.lock b/yarn.lock
index f46c25c..1d7b838 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2012,7 +2012,7 @@ core-js@^1.0.0:
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-1.2.7.tgz#652294c14651db28fa93bd2d5ff2983a4f08c636"
   integrity sha1-ZSKUwUZR2yj6k70tX/KYOk8IxjY=
 
-core-js@^2.4.0, core-js@^2.5.3, core-js@^2.6.5:
+core-js@^2.4.0, core-js@^2.6.5:
   version "2.6.11"
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.11.tgz#38831469f9922bded8ee21c9dc46985e0399308c"
   integrity sha512-5wjnpaT/3dV+XB4borEsnAYQchn00XSgTAWKDkEqv+K8KevjbzmofK6hfJ9TZIlpj2N0xQpazy7PiRQiWHqzWg==
@@ -3570,15 +3570,6 @@ map-visit@^1.0.0:
   dependencies:
     object-visit "^1.0.0"
 
-markdown-navbar@^1.1.2:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/markdown-navbar/-/markdown-navbar-1.1.2.tgz#8d8fa0d7dce44e62695e627e3a2146c1b64dad60"
-  integrity sha512-A1ql1Eq86Jonl/4fXN5h3iP/RqnnG823GHDfKLX76SV76xZa5QmGYuGLx1r/yKe/JwscqzxUYTk5Qy++OqlT3g==
-  dependencies:
-    core-js "^2.5.3"
-    prop-types "^15.6.0"
-    react "^16.2.0"
-
 marked@^0.8.0:
   version "0.8.0"
   resolved "https://registry.yarnpkg.com/marked/-/marked-0.8.0.tgz#ec5c0c9b93878dc52dd54be8d0e524097bd81a99"
@@ -5417,7 +5408,7 @@ react-slick@~0.25.2:
     lodash.debounce "^4.0.8"
     resize-observer-polyfill "^1.5.0"
 
-react@16.12.0, react@^16.2.0:
+react@16.12.0:
   version "16.12.0"
   resolved "https://registry.yarnpkg.com/react/-/react-16.12.0.tgz#0c0a9c6a142429e3614834d5a778e18aa78a0b83"
   integrity sha512-fglqy3k5E+81pA8s+7K0/T3DBCF0ZDOher1elBFzF7O6arXJgzyu/FW+COxFvAWXJoJN9KIZbT2LXlukwphYTA==
@@ -5756,9 +5747,9 @@ shallowequal@^1.0.2, shallowequal@^1.1.0:
   integrity sha512-y0m1JoUZSlPAjXVtPPW70aZWfIL/dSP7AFkRnniLCrK/8MDKog3TySTBmckD+RObVxH0v4Tox67+F14PdED2oQ==
 
 shell-quote@^1.6.1:
-  version "1.7.2"
-  resolved "https://registry.yarnpkg.com/shell-quote/-/shell-quote-1.7.2.tgz#67a7d02c76c9da24f99d20808fcaded0e0e04be2"
-  integrity sha512-mRz/m/JVscCrkMyPqHc/bczi3OQHkLTqXHEFu0zDhK/qfv3UcOA4SVmRCLmos4bhjr9ekVQubj/R7waKapmiQg==
+  version "1.7.3"
+  resolved "https://registry.yarnpkg.com/shell-quote/-/shell-quote-1.7.3.tgz#aa40edac170445b9a431e17bb62c0b881b9c4123"
+  integrity sha512-Vpfqwm4EnqGdlsBFNmHhxhElJYrdfcxPThu+ryKS5J8L/fhAwLazFZtq+S+TWZ9ANj2piSQLGj6NQg+lKPmxrw==
 
 signal-exit@^3.0.2:
   version "3.0.2"