diff --git a/package-lock.json b/package-lock.json
index aab22da..b47aeb2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -172,9 +172,9 @@
       "dev": true
     },
     "acorn": {
-      "version": "5.7.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.1.tgz",
-      "integrity": "sha512-d+nbxBUGKg7Arpsvbnlq61mc12ek3EY8EQldM3GPAhWJ1UVxC6TDGbIvUMNU6obBX3i1+ptCIzV4vq0gFPEGVQ=="
+      "version": "5.7.4",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.4.tgz",
+      "integrity": "sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg=="
     },
     "acorn-jsx": {
       "version": "5.0.2",
diff --git a/package.json b/package.json
index 6dee634..0efe723 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
     "tap": "^14.6.1"
   },
   "dependencies": {
-    "acorn": "5.7.1",
+    "acorn": "5.7.4",
     "debug": "^4.1.1",
     "needle": "^2.4.0",
     "semver": "^6.3.0",
diff --git a/test/method-detection.test.js b/test/method-detection.test.js
index 3f71b40..b84d77b 100644
--- a/test/method-detection.test.js
+++ b/test/method-detection.test.js
@@ -27,7 +27,9 @@ test('test bootstrap +function method detection', function (t) {
 test('test clashing variable/function declaration', function (t) {
   const contents = `
 var foo;
-function foo() {
+{
+  function foo() {
+  }
 }
 `;
   const methods = ['foo'];
@@ -35,7 +37,7 @@ function foo() {
     contents, methods,
   );
   t.same(sorted(Object.keys(found)), sorted(methods));
-  t.equal(found[methods[0]].start.line, 3, 'foo');
+  t.equal(found[methods[0]].start.line, 4, 'foo');
   t.end();
 });