diff --git a/arduino-mocha/package.json b/arduino-mocha/package.json
index 205891e0..219fbcff 100644
--- a/arduino-mocha/package.json
+++ b/arduino-mocha/package.json
@@ -11,6 +11,6 @@
   "license": "ISC",
   "dependencies": {
     "johnny-five": "^0.13.0",
-    "mocha": "^3.3.0"
+    "mocha": "^5.0.0"
   }
 }
diff --git a/bowling-game/tabcorp/17-05-2017/package.json b/bowling-game/tabcorp/17-05-2017/package.json
index 90579161..392c6eef 100644
--- a/bowling-game/tabcorp/17-05-2017/package.json
+++ b/bowling-game/tabcorp/17-05-2017/package.json
@@ -4,6 +4,6 @@
     "test": "mocha -w"
   },
   "devDependencies": {
-    "mocha": "3.5.3"
+    "mocha": "5.0.1"
   }
 }
diff --git a/bowling-game/tabcorp/31-05-2017/package.json b/bowling-game/tabcorp/31-05-2017/package.json
index 90579161..392c6eef 100644
--- a/bowling-game/tabcorp/31-05-2017/package.json
+++ b/bowling-game/tabcorp/31-05-2017/package.json
@@ -4,6 +4,6 @@
     "test": "mocha -w"
   },
   "devDependencies": {
-    "mocha": "3.5.3"
+    "mocha": "5.0.1"
   }
 }
diff --git a/equal-sides-of-an-array/package.json b/equal-sides-of-an-array/package.json
index 5c0da7c4..2357ecf1 100644
--- a/equal-sides-of-an-array/package.json
+++ b/equal-sides-of-an-array/package.json
@@ -4,6 +4,6 @@
     "test": "mocha -w"
   },
   "devDependencies": {
-    "mocha": "3.5.3"
+    "mocha": "5.0.1"
   }
 }
diff --git a/es6-promise/package.json b/es6-promise/package.json
index 2f4eaa2f..c832da15 100644
--- a/es6-promise/package.json
+++ b/es6-promise/package.json
@@ -5,6 +5,6 @@
   },
   "devDependencies": {
     "assert": "1.4.1",
-    "mocha": "3.5.3"
+    "mocha": "5.0.1"
   }
 }
diff --git a/revenge-of-the-pancakes/package.json b/revenge-of-the-pancakes/package.json
index 95c2b06e..4a38028b 100644
--- a/revenge-of-the-pancakes/package.json
+++ b/revenge-of-the-pancakes/package.json
@@ -4,6 +4,6 @@
     "test": "mocha -w"
   },
   "devDependencies": {
-    "mocha": "3.5.3"
+    "mocha": "5.0.1"
   }
 }
diff --git a/roman-numerals/package.json b/roman-numerals/package.json
index d80fa475..81db4a84 100644
--- a/roman-numerals/package.json
+++ b/roman-numerals/package.json
@@ -4,6 +4,6 @@
     "test": "mocha -w"
   },
   "devDependencies": {
-    "mocha": "3.5.3"
+    "mocha": "5.0.1"
   }
 }