diff --git a/package.json b/package.json
index 4833d8b..8a244e6 100644
--- a/package.json
+++ b/package.json
@@ -77,7 +77,7 @@
     "prettier": "^1.17.1",
     "standard-version": "^6.0.1",
     "trash-cli": "^1.4.0",
-    "tslint": "^5.18.0",
+    "tslint": "^5.20.0",
     "tslint-config-prettier": "^1.18.0",
     "tslint-immutable": "^6.0.1",
     "typedoc": "^0.15.0",
diff --git a/yarn.lock b/yarn.lock
index d2f403d..45971fb 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1542,9 +1542,9 @@ detect-newline@3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/detect-newline/-/detect-newline-3.0.0.tgz#8ae477c089e51872c264531cd6547719c0b86b2f"
 
-diff@^3.2.0:
-  version "3.5.0"
-  resolved "https://registry.yarnpkg.com/diff/-/diff-3.5.0.tgz#800c0dd1e0a8bfbc95835c202ad220fe317e5a12"
+diff@^4.0.1:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/diff/-/diff-4.0.1.tgz#0c667cb467ebbb5cea7f14f135cc2dba7780a8ff"
 
 dir-glob@^2.0.0:
   version "2.0.0"
@@ -4704,15 +4704,15 @@ tslint-immutable@^6.0.1:
   dependencies:
     tsutils "^2.28.0 || ^3.0.0"
 
-tslint@^5.18.0:
-  version "5.18.0"
-  resolved "https://registry.yarnpkg.com/tslint/-/tslint-5.18.0.tgz#f61a6ddcf372344ac5e41708095bbf043a147ac6"
+tslint@^5.20.0:
+  version "5.20.0"
+  resolved "https://registry.yarnpkg.com/tslint/-/tslint-5.20.0.tgz#fac93bfa79568a5a24e7be9cdde5e02b02d00ec1"
   dependencies:
     "@babel/code-frame" "^7.0.0"
     builtin-modules "^1.1.1"
     chalk "^2.3.0"
     commander "^2.12.1"
-    diff "^3.2.0"
+    diff "^4.0.1"
     glob "^7.1.1"
     js-yaml "^3.13.1"
     minimatch "^3.0.4"