diff --git a/package-lock.json b/package-lock.json
index 619f29662c6..f3f547b3402 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -373,7 +373,7 @@
         },
         "util": {
           "version": "0.10.3",
-          "resolved": "http://registry.npmjs.org/util/-/util-0.10.3.tgz",
+          "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
           "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
           "dev": true,
           "requires": {
@@ -1380,7 +1380,7 @@
     },
     "htmlescape": {
       "version": "1.1.1",
-      "resolved": "http://registry.npmjs.org/htmlescape/-/htmlescape-1.1.1.tgz",
+      "resolved": "https://registry.npmjs.org/htmlescape/-/htmlescape-1.1.1.tgz",
       "integrity": "sha1-OgPtwiFLyjtmQko+eVk0lQnLA1E=",
       "dev": true
     },
@@ -3190,9 +3190,9 @@
       "dev": true
     },
     "prettier": {
-      "version": "1.13.7",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-1.13.7.tgz",
-      "integrity": "sha512-KIU72UmYPGk4MujZGYMFwinB7lOf2LsDNGSOC8ufevsrPLISrZbNJlWstRi3m0AMuszbH+EFSQ/r6w56RSPK6w==",
+      "version": "1.15.2",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-1.15.2.tgz",
+      "integrity": "sha512-YgPLFFA0CdKL4Eg2IHtUSjzj/BWgszDHiNQAe0VAIBse34148whfdzLagRL+QiKS+YfK5ftB6X4v/MBw8yCoug==",
       "dev": true
     },
     "process": {
@@ -3408,9 +3408,9 @@
       }
     },
     "rollup": {
-      "version": "0.66.6",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-0.66.6.tgz",
-      "integrity": "sha512-J7/SWanrcb83vfIHqa8+aVVGzy457GcjA6GVZEnD0x2u4OnOd0Q1pCrEoNe8yLwM6z6LZP02zBT2uW0yh5TqOw==",
+      "version": "0.67.3",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-0.67.3.tgz",
+      "integrity": "sha512-TyNQCz97rKuVVbsKUTXfwIjV7UljWyTVd7cTMuE+aqlQ7WJslkYF5QaYGjMLR2BlQtUOO5CAxSVnpQ55iYp5jg==",
       "dev": true,
       "requires": {
         "@types/estree": "0.0.39",
@@ -3635,7 +3635,7 @@
     },
     "strip-ansi": {
       "version": "3.0.1",
-      "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
       "dev": true,
       "requires": {
diff --git a/package.json b/package.json
index 25b7e39f9dc..75b1ca2b98c 100644
--- a/package.json
+++ b/package.json
@@ -50,8 +50,8 @@
     "coveralls": "^3.0.2",
     "mocha": "^5.2.0",
     "nyc": "^13.1.0",
-    "prettier": "1.13.7",
-    "rollup": "^0.66.6",
+    "prettier": "1.15.2",
+    "rollup": "^0.67.3",
     "rollup-plugin-commonjs": "^9.2.0",
     "rollup-plugin-node-resolve": "^3.4.0",
     "source-map-support": "^0.5.9",
diff --git a/src/check/arbitrary/SetArbitrary.ts b/src/check/arbitrary/SetArbitrary.ts
index fa0fb1dac6c..89d9d919b1e 100644
--- a/src/check/arbitrary/SetArbitrary.ts
+++ b/src/check/arbitrary/SetArbitrary.ts
@@ -88,10 +88,10 @@ function set<T>(
     compareFn != null
       ? compareFn
       : typeof bLength === 'function'
-        ? (bLength as (a: T, b: T) => boolean)
-        : typeof aLength === 'function'
-          ? (aLength as (a: T, b: T) => boolean)
-          : (a: T, b: T) => a === b;
+      ? (bLength as (a: T, b: T) => boolean)
+      : typeof aLength === 'function'
+      ? (aLength as (a: T, b: T) => boolean)
+      : (a: T, b: T) => a === b;
 
   const arrayArb = new ArrayArbitrary<T>(arb, minLength, maxLength, buildCompareFilter(compare));
   if (minLength === 0) return arrayArb;