diff --git a/.travis.yml b/.travis.yml
index fa722204..6618c343 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -42,8 +42,11 @@ before_install:
   - |
     # mocha for testing
     # - use 2.x for Node.js < 0.10
+    # - use 3.x for Node.js < 4
     if [[ "$(cut -d. -f1 <<< "$TRAVIS_NODE_VERSION")" -eq 0 && "$(cut -d. -f2 <<< "$TRAVIS_NODE_VERSION")" -lt 10 ]]; then
       npm install --save-dev mocha@2.5.3
+    elif [[ "$(cut -d. -f1 <<< "$TRAVIS_NODE_VERSION")" -lt 4 ]]; then
+      npm install --save-dev mocha@3.5.3
     fi
   - |
     # supertest for testing
diff --git a/appveyor.yml b/appveyor.yml
index e634ca95..c3f50988 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -42,12 +42,16 @@ install:
   - ps: |
       # mocha for testing
       # - use 2.x for Node.js < 0.10
+      # - use 3.x for Node.js < 4
       if ([int]$env:nodejs_version.split(".")[0] -eq 0 -and [int]$env:nodejs_version.split(".")[1] -lt 10) {
         npm install --silent --save-dev mocha@2.5.3
+      } elseif ([int]$env:nodejs_version.split(".")[0] -lt 4) {
+        npm install --silent --save-dev mocha@3.5.3
       }
   - ps: |
       # mocha for testing
       # - use 1.1.0 for Node.js < 0.10
+      # - use 3.x for Node.js < 4
       if ([int]$env:nodejs_version.split(".")[0] -eq 0 -and [int]$env:nodejs_version.split(".")[1] -lt 10) {
         npm install --silent --save-dev supertest@1.1.0
       }
diff --git a/package.json b/package.json
index 1d1ffad3..71a1d404 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "eslint": "5.16.0",
     "eslint-plugin-markdown": "1.0.0",
     "istanbul": "0.4.5",
-    "mocha": "3.5.3",
+    "mocha": "4.1.0",
     "supertest": "2.0.0"
   },
   "files": [