diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 28659f6bd..7386f9dca 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -82,6 +82,12 @@ and inspect the outcome. Example: [RatInAMaze.test.js](Backtracking/tests/RatInA
 
 Please refrain from using `console` in your implementation AND test code.
 
+First you should install all dependencies using:
+
+```shell
+npm install
+```
+
 You can (and should!) run all tests locally before committing your changes:
 
 ```shell
diff --git a/package-lock.json b/package-lock.json
index d7cb0da2e..d3f460066 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -23,7 +23,7 @@
         "babel-jest": "^26.3.0",
         "globby": "^12.0.2",
         "husky": "^7.0.4",
-        "jest": "^26.4.2",
+        "jest": "^26.6.3",
         "standard": "^16.0.4"
       },
       "engines": {
diff --git a/package.json b/package.json
index 8ba035922..f7865aebe 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "babel-jest": "^26.3.0",
     "globby": "^12.0.2",
     "husky": "^7.0.4",
-    "jest": "^26.4.2",
+    "jest": "^26.6.3",
     "standard": "^16.0.4"
   },
   "engines": {