diff --git a/yarn.lock b/yarn.lock
index 240bd4ab..6cae1a4a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -444,18 +444,12 @@ debug@^1.0.4:
   dependencies:
     ms "2.0.0"
 
-debug@^3.1.0:
+debug@^3.1.0, debug@~3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/debug/-/debug-3.1.0.tgz#5bb5a0672628b64149566ba16819e61518c67261"
   dependencies:
     ms "2.0.0"
 
-debug@~2.2.0:
-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-2.2.0.tgz#f87057e995b1a1f6ae6a4960664137bc56f039da"
-  dependencies:
-    ms "0.7.1"
-
 decamelize@^1.0.0, decamelize@^1.1.1:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-1.2.0.tgz#f6534d15148269b20352e7bee26f501f9a191290"
@@ -837,11 +831,11 @@ graceful-fs@^4.1.2:
   resolved "https://registry.yarnpkg.com/graceful-readlink/-/graceful-readlink-1.0.1.tgz#4cafad76bc62f02fa039b2f94e9a3dd3a391a725"
 
 grainstore@~1.6.0:
-  version "1.6.3"
-  resolved "https://registry.yarnpkg.com/grainstore/-/grainstore-1.6.3.tgz#6900cc811aadc1ed2c00fcd429c672f8b8e1a5cb"
+  version "1.6.4"
+  resolved "https://registry.yarnpkg.com/grainstore/-/grainstore-1.6.4.tgz#617b93c5e2de8f544375202da89b9208a8b3d762"
   dependencies:
     carto "0.16.3"
-    debug "~2.2.0"
+    debug "~3.1.0"
     generic-pool "~2.2.0"
     millstone "0.6.17"
     postcss "~5.2.8"
@@ -1377,10 +1371,6 @@ moment@^2.10.6, moment@~2.18.1:
   version "2.18.1"
   resolved "https://registry.yarnpkg.com/moment/-/moment-2.18.1.tgz#c36193dd3ce1c2eed2adb7c802dbbc77a81b1c0f"
 
-ms@0.7.1:
-  version "0.7.1"
-  resolved "https://registry.yarnpkg.com/ms/-/ms-0.7.1.tgz#9cd13c03adbff25b65effde7ce864ee952017098"
-
 ms@0.7.2:
   version "0.7.2"
   resolved "https://registry.yarnpkg.com/ms/-/ms-0.7.2.tgz#ae25cf2512b3885a1d95d7f037868d8431124765"