diff --git a/package.json b/package.json
index ebfa8fb..952bcca 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "koa-validate": "^1.0.7",
     "mapshaper": "^0.4.163",
     "ogr2ogr": "^2.0.0",
-    "xlsx": "^0.15.6"
+    "xlsx": "^0.17.0"
   },
   "devDependencies": {
     "chai": "^4.2.0",
diff --git a/yarn.lock b/yarn.lock
index cfbe1c6..a07eca5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2180,6 +2180,11 @@ fecha@^2.3.3:
   resolved "https://registry.yarnpkg.com/fecha/-/fecha-2.3.3.tgz#948e74157df1a32fd1b12c3a3c3cdcb6ec9d96cd"
   integrity sha512-lUGBnIamTAwk4znq5BcqsDaxSmZ9nDVJaij6NvRt/Tg4R69gERA+otPKbS86ROw9nxVMw2/mp1fnaiWqbs6Sdg==
 
+fflate@^0.3.8:
+  version "0.3.11"
+  resolved "https://registry.yarnpkg.com/fflate/-/fflate-0.3.11.tgz#2c440d7180fdeb819e64898d8858af327b042a5d"
+  integrity sha512-Rr5QlUeGN1mbOHlaqcSYMKVpPbgLy0AWT/W0EHxA6NGI12yO1jpoui2zBBvU2G824ltM6Ut8BFgfHSBGfkmS0A==
+
 figures@^1.7.0:
   version "1.7.0"
   resolved "https://registry.yarnpkg.com/figures/-/figures-1.7.0.tgz#cbe1e3affcf1cd44b80cadfed28dc793a9701d2e"
@@ -5740,10 +5745,10 @@ sprintf-js@~1.0.2:
   resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
   integrity sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=
 
-ssf@~0.10.3:
-  version "0.10.3"
-  resolved "https://registry.yarnpkg.com/ssf/-/ssf-0.10.3.tgz#8eae1fc29c90a552e7921208f81892d6f77acb2b"
-  integrity sha512-pRuUdW0WwyB2doSqqjWyzwCD6PkfxpHAHdZp39K3dp/Hq7f+xfMwNAWIi16DyrRg4gg9c/RvLYkJTSawTPTm1w==
+ssf@~0.11.2:
+  version "0.11.2"
+  resolved "https://registry.yarnpkg.com/ssf/-/ssf-0.11.2.tgz#0b99698b237548d088fc43cdf2b70c1a7512c06c"
+  integrity sha512-+idbmIXoYET47hH+d7dfm2epdOMUDjqcB4648sTZ+t2JwoyBFL/insLfB/racrDmsKB3diwsDA696pZMieAC5g==
   dependencies:
     frac "~1.1.2"
 
@@ -6478,6 +6483,11 @@ word-wrap@~1.2.3:
   resolved "https://registry.yarnpkg.com/word-wrap/-/word-wrap-1.2.3.tgz#610636f6b1f703891bd34771ccb17fb93b47079c"
   integrity sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==
 
+word@~0.3.0:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/word/-/word-0.3.0.tgz#8542157e4f8e849f4a363a288992d47612db9961"
+  integrity sha512-OELeY0Q61OXpdUfTp+oweA/vtLVg5VDOXh+3he3PNzLGG/y0oylSOC1xRVj0+l4vQ3tj/bB1HVHv1ocXkQceFA==
+
 wordwrap@~0.0.2:
   version "0.0.3"
   resolved "https://registry.yarnpkg.com/wordwrap/-/wordwrap-0.0.3.tgz#a3d5da6cd5c0bc0008d37234bbaf1bed63059107"
@@ -6545,10 +6555,10 @@ xdg-basedir@^3.0.0:
   resolved "https://registry.yarnpkg.com/xdg-basedir/-/xdg-basedir-3.0.0.tgz#496b2cc109eca8dbacfe2dc72b603c17c5870ad4"
   integrity sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ=
 
-xlsx@^0.15.6:
-  version "0.15.6"
-  resolved "https://registry.yarnpkg.com/xlsx/-/xlsx-0.15.6.tgz#461f841d6d9ea1a8375e2cd246bf23aece08a1d5"
-  integrity sha512-7vD9eutyLs65iDjNFimVN+gk/oDkfkCgpQUjdE82QgzJCrBHC4bGPH7fzKVyy0UPp3gyFVQTQEFJaWaAvZCShQ==
+xlsx@^0.17.0:
+  version "0.17.0"
+  resolved "https://registry.yarnpkg.com/xlsx/-/xlsx-0.17.0.tgz#028176a0140967dcee1817d221678461e47481c8"
+  integrity sha512-bZ36FSACiAyjoldey1+7it50PMlDp1pcAJrZKcVZHzKd8BC/z6TQ/QAN8onuqcepifqSznR6uKnjPhaGt6ig9A==
   dependencies:
     adler-32 "~1.2.0"
     cfb "^1.1.4"
@@ -6556,8 +6566,10 @@ xlsx@^0.15.6:
     commander "~2.17.1"
     crc-32 "~1.2.0"
     exit-on-epipe "~1.0.1"
-    ssf "~0.10.3"
+    fflate "^0.3.8"
+    ssf "~0.11.2"
     wmf "~1.0.1"
+    word "~0.3.0"
 
 xregexp@^4.3.0:
   version "4.3.0"