diff --git a/package.json b/package.json
index b8b2d1d..89464fe 100644
--- a/package.json
+++ b/package.json
@@ -8,15 +8,15 @@
   },
   "dependencies": {
     "ansi-html": "0.0.5",
-    "babel-core": "^6.13.0",
-    "babel-plugin-transform-decorators-legacy": "1.3.4",
-    "babel-preset-es2015": "^6.13.0",
-    "babel-preset-react": "^6.11.0",
+    "babel-core": "^6.14.0",
+    "babel-plugin-transform-decorators-legacy": "^1.3.4",
+    "babel-preset-es2015": "^6.14.0",
+    "babel-preset-react": "^6.11.1",
     "babel-preset-stage-0": "^6.5.0",
-    "babel-traverse": "^6.13.0",
-    "babel-types": "^6.7.2",
-    "babelify": "^7.2.0",
-    "babylon": "^6.5.2",
+    "babel-traverse": "^6.15.0",
+    "babel-types": "^6.15.0",
+    "babelify": "^7.3.0",
+    "babylon": "^6.9.1",
     "chalk": "^1.1.1",
     "chokidar": "^1.2.0",
     "concat-stream": "^1.5.0",
diff --git a/test/fixture/literal_types.input.js b/test/fixture/literal_types.input.js
index 4f791a5..9ed0eeb 100644
--- a/test/fixture/literal_types.input.js
+++ b/test/fixture/literal_types.input.js
@@ -1,7 +1,7 @@
 /**
- * @param {'a' | "b" | '' | 0 | 42 | 3.14} x
+ * @param {'a' | "b" | '' | 0 | -42 | 3.14} x
  */
 function f(x) {}
 
 /** */
-function g(x: 'a' | "b" | '' | 0 | 42 | 3.14) {}
+function g(x: 'a' | "b" | '' | 0 | -42 | 3.14) {}
diff --git a/test/fixture/literal_types.output.json b/test/fixture/literal_types.output.json
index ee4aa29..2aa36d0 100644
--- a/test/fixture/literal_types.output.json
+++ b/test/fixture/literal_types.output.json
@@ -27,7 +27,7 @@
             },
             {
               "type": "NumericLiteralType",
-              "value": 42
+              "value": -42
             },
             {
               "type": "NumericLiteralType",
@@ -86,7 +86,7 @@
             },
             {
               "type": "NumericLiteralType",
-              "value": 42
+              "value": -42
             },
             {
               "type": "NumericLiteralType",
@@ -131,7 +131,7 @@
         },
         "end": {
           "line": 7,
-          "column": 48
+          "column": 49
         }
       }
     },
@@ -164,7 +164,7 @@
             },
             {
               "type": "NumericLiteralType",
-              "value": 42
+              "value": -42
             },
             {
               "type": "NumericLiteralType",
diff --git a/test/fixture/literal_types.output.md b/test/fixture/literal_types.output.md
index 1539fe6..74753d4 100644
--- a/test/fixture/literal_types.output.md
+++ b/test/fixture/literal_types.output.md
@@ -4,10 +4,10 @@
 
 **Parameters**
 
--   `x` **(`"a"` \| `"b"` \| `""` \| `0` \| `42` \| `3.14`)** 
+-   `x` **(`"a"` \| `"b"` \| `""` \| `0` \| `-42` \| `3.14`)** 
 
 # g
 
 **Parameters**
 
--   `x` **(`"a"` \| `"b"` \| `""` \| `0` \| `42` \| `3.14`)** 
+-   `x` **(`"a"` \| `"b"` \| `""` \| `0` \| `-42` \| `3.14`)** 
diff --git a/test/fixture/literal_types.output.md.json b/test/fixture/literal_types.output.md.json
index c053c5d..73c1d7f 100644
--- a/test/fixture/literal_types.output.md.json
+++ b/test/fixture/literal_types.output.md.json
@@ -83,7 +83,7 @@
                     },
                     {
                       "type": "inlineCode",
-                      "value": "42"
+                      "value": "-42"
                     },
                     {
                       "type": "text",
@@ -187,7 +187,7 @@
                     },
                     {
                       "type": "inlineCode",
-                      "value": "42"
+                      "value": "-42"
                     },
                     {
                       "type": "text",