diff --git a/.ci/.azure-pipelines-steps.yml b/.ci/.azure-pipelines-steps.yml
index b54ea9b..59369c3 100644
--- a/.ci/.azure-pipelines-steps.yml
+++ b/.ci/.azure-pipelines-steps.yml
@@ -1,4 +1,8 @@
 steps:
+- script: npm i -g npm@$(npm_version)
+  displayName: Use non-broken npm version $(npm_version)
+  condition: ne(variables['npm_version'], '')
+
 - task: NodeTool@0
   inputs:
     versionSpec: '$(node_version)'
@@ -13,14 +17,10 @@ steps:
 - script: npm run coveralls
   displayName: Run coveralls
   env:
-    # Pretend to be AppVeyor for now
-    APPVEYOR: true
-    APPVEYOR_BUILD_NUMBER: $(Build.BuildNumber)
-    APPVEYOR_BUILD_ID: $(Agent.OS)_$(node_version)
-    APPVEYOR_REPO_COMMIT: $(Build.SourceVersion)
-    APPVEYOR_REPO_BRANCH: $(Build.SourceBranchName)
-    # Overwrite the AppVeyor Service Name
     COVERALLS_SERVICE_NAME: Azure Pipelines
+    COVERALLS_SERVICE_NUMBER: $(Build.BuildNumber)
+    COVERALLS_SERVICE_JOB_ID: "$(Agent.OS)_$(node_version)"
+    COVERALLS_GIT_BRANCH: $(Build.SourceBranchName)
     COVERALLS_REPO_TOKEN: $(COVERALLS_REPO_TOKEN_SECRET)
     COVERALLS_PARALLEL: true
     CI_PULL_REQUEST: $(System.PullRequest.PullRequestNumber)
diff --git a/.ci/.azure-pipelines.yml b/.ci/.azure-pipelines.yml
index 9294859..195683a 100644
--- a/.ci/.azure-pipelines.yml
+++ b/.ci/.azure-pipelines.yml
@@ -21,13 +21,15 @@ jobs:
   - job: Test_Windows
     displayName: Run Tests on Windows
     pool:
-      vmImage: vs2017-win2016
+      vmImage: "windows-2019"
     strategy:
       matrix:
         Node_v10:
           node_version: 10
+          npm_version: 6.4.1
         Node_v8:
           node_version: 8
+          npm_version: 6.4.1
         Node_v6:
           node_version: 6
     steps:
@@ -36,7 +38,7 @@ jobs:
   - job: Test_MacOS
     displayName: Run Tests on MacOS
     pool:
-      vmImage: macos-10.13
+      vmImage: "macOS-10.15"
     strategy:
       matrix:
         Node_v10:
diff --git a/appveyor.yml b/appveyor.yml
index 8ead79d..f6cfcfb 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -10,6 +10,7 @@ environment:
 
 install:
   - ps: Install-Product node $env:nodejs_version
+  - npm install -g npm@6.4.1
   - npm install
 
 test_script:
diff --git a/index.js b/index.js
index 2ded6ea..789dbbf 100644
--- a/index.js
+++ b/index.js
@@ -8,7 +8,7 @@ var slash = '/';
 var backslash = /\\/g;
 var enclosure = /[\{\[].*[\/]*.*[\}\]]$/;
 var globby = /(^|[^\\])([\{\[]|\([^\)]+$)/;
-var escaped = /\\([\*\?\|\[\]\(\)\{\}])/g;
+var escaped = /\\([\!\*\?\|\[\]\(\)\{\}])/g;
 
 /**
  * @param {string} str
diff --git a/package.json b/package.json
index 0f7ec23..1dfd6bc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "glob-parent",
-  "version": "5.1.0",
+  "version": "5.1.1",
   "description": "Extract the non-magic parent path from a glob string.",
   "author": "Gulp Team <team@gulpjs.com> (https://gulpjs.com/)",
   "contributors": [
@@ -28,7 +28,7 @@
     "is-glob": "^4.0.1"
   },
   "devDependencies": {
-    "coveralls": "github:phated/node-coveralls#2.x",
+    "coveralls": "^3.0.11",
     "eslint": "^2.13.1",
     "eslint-config-gulp": "^3.0.1",
     "expect": "^1.20.2",
diff --git a/test/index.test.js b/test/index.test.js
index d3e7a71..c13bf04 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -78,6 +78,7 @@ describe('glob-parent', function() {
     assert.equal(gp('[bar]/'), '.');
     assert.equal(gp('./\\[bar]'), './[bar]');
     assert.equal(gp('\\[bar]/'), '[bar]');
+    assert.equal(gp('\\!dir/*'), '!dir');
     assert.equal(gp('[bar\\]/'), '.');
     assert.equal(gp('path/foo \\[bar]/'), 'path/foo [bar]');
     assert.equal(gp('path/\\{foo,bar}/'), 'path/{foo,bar}');