diff --git a/package.json b/package.json
index 7c70332..2776c53 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "eslint-plugin-prettier": "2.6.0",
     "fhir-errors": "1.0.0",
     "prettier": "1.12.1",
-    "sinon": "5.0.7",
+    "sinon": "5.0.9",
     "tap": "12.0.1"
   },
   "engines": {
diff --git a/yarn.lock b/yarn.lock
index b517e4b..a1f1c6e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -611,7 +611,7 @@ diff@^1.3.2:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/diff/-/diff-1.4.0.tgz#7f28d2eb9ee7b15a97efd89ce63dcfdaa3ccbabf"
 
-diff@^3.1.0:
+diff@^3.5.0:
   version "3.5.0"
   resolved "https://registry.yarnpkg.com/diff/-/diff-3.5.0.tgz#800c0dd1e0a8bfbc95835c202ad220fe317e5a12"
 
@@ -1458,10 +1458,14 @@ log-driver@^1.2.5:
   version "1.2.7"
   resolved "https://registry.yarnpkg.com/log-driver/-/log-driver-1.2.7.tgz#63b95021f0702fedfa2c9bb0a24e7797d71871d8"
 
-lolex@^2.2.0, lolex@^2.3.2:
+lolex@^2.3.2:
   version "2.3.2"
   resolved "https://registry.yarnpkg.com/lolex/-/lolex-2.3.2.tgz#85f9450425103bf9e7a60668ea25dc43274ca807"
 
+lolex@^2.4.2:
+  version "2.6.0"
+  resolved "https://registry.yarnpkg.com/lolex/-/lolex-2.6.0.tgz#cf9166f3c9dece3cdeb5d6b01fce50f14a1203e3"
+
 longest@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/longest/-/longest-1.0.1.tgz#30a0b2da38f73770e8294a0d22e6625ed77d0097"
@@ -1647,9 +1651,9 @@ natural-compare@^1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/natural-compare/-/natural-compare-1.4.0.tgz#4abebfeed7541f2c27acfb29bdbbd15c8d5ba4f7"
 
-nise@^1.2.0:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/nise/-/nise-1.3.0.tgz#7d6d506e64a0e37959495157f30a799c0436df72"
+nise@^1.3.3:
+  version "1.3.3"
+  resolved "https://registry.yarnpkg.com/nise/-/nise-1.3.3.tgz#c17a850066a8a1dfeb37f921da02441afc4a82ba"
   dependencies:
     "@sinonjs/formatio" "^2.0.0"
     just-extend "^1.1.27"
@@ -2139,17 +2143,17 @@ signal-exit@^3.0.0, signal-exit@^3.0.1, signal-exit@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
 
-sinon@5.0.7:
-  version "5.0.7"
-  resolved "https://registry.yarnpkg.com/sinon/-/sinon-5.0.7.tgz#3bded6a73613ccc9e512e20246ced69a27c27dab"
+sinon@5.0.9:
+  version "5.0.9"
+  resolved "https://registry.yarnpkg.com/sinon/-/sinon-5.0.9.tgz#0926049096eea92b2dd5588b9db59fd2a708d679"
   dependencies:
     "@sinonjs/formatio" "^2.0.0"
-    diff "^3.1.0"
+    diff "^3.5.0"
     lodash.get "^4.4.2"
-    lolex "^2.2.0"
-    nise "^1.2.0"
-    supports-color "^5.1.0"
-    type-detect "^4.0.5"
+    lolex "^2.4.2"
+    nise "^1.3.3"
+    supports-color "^5.4.0"
+    type-detect "^4.0.8"
 
 slice-ansi@1.0.0:
   version "1.0.0"
@@ -2354,12 +2358,18 @@ supports-color@^3.1.2:
   dependencies:
     has-flag "^1.0.0"
 
-supports-color@^5.1.0, supports-color@^5.3.0:
+supports-color@^5.3.0:
   version "5.3.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.3.0.tgz#5b24ac15db80fa927cf5227a4a33fd3c4c7676c0"
   dependencies:
     has-flag "^3.0.0"
 
+supports-color@^5.4.0:
+  version "5.4.0"
+  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.4.0.tgz#1c6b337402c2137605efe19f10fec390f6faab54"
+  dependencies:
+    has-flag "^3.0.0"
+
 table@4.0.2:
   version "4.0.2"
   resolved "https://registry.yarnpkg.com/table/-/table-4.0.2.tgz#a33447375391e766ad34d3486e6e2aedc84d2e36"
@@ -2529,7 +2539,7 @@ type-check@~0.3.2:
   dependencies:
     prelude-ls "~1.1.2"
 
-type-detect@^4.0.5:
+type-detect@^4.0.8:
   version "4.0.8"
   resolved "https://registry.yarnpkg.com/type-detect/-/type-detect-4.0.8.tgz#7646fb5f18871cfbb7749e69bd39a6388eb7450c"