diff --git a/.travis.yml b/.travis.yml
index ad10645..967eb58 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,8 +7,7 @@ sudo: false
 install:
   - nvm install 6
   - nvm use 6
-  - npm install -g elm@0.17.1 elm-test@0.17.3
-  - elm package install -y
+  - npm install
   - bin/install-elm-format linux
   - export PATH=$PATH:$PWD/bin
 
@@ -19,4 +18,5 @@ script:
 
 cache:
   directories:
-  - elm-stuff
+    - node_modules
+    - elm-stuff
diff --git a/bin/build.sh b/bin/build.sh
index 6a84349..53b5eee 100755
--- a/bin/build.sh
+++ b/bin/build.sh
@@ -12,7 +12,7 @@ if [ $? -ne 0 ]; then
   exit 1
 fi
 
-elm-format --yes --validate exercises/**/*{.example,Tests.elm}
+elm-format --yes --validate exercises/**/{*.example.elm,Tests.elm}
 
 if [ $? -ne 0 ]; then
     echo "*******************************************************************"
@@ -33,19 +33,19 @@ fi
 declare -i TEST_RESULT=0
 FAILED_EXERCISES=''
 
-for example_file in exercises/**/*.example
+for example_file in exercises/**/*.example.elm
 do
   exercise_dir=$(dirname $example_file)
-  exercise=$(basename $example_file .example)
-  mv "$exercise_dir/$exercise.elm" "$exercise_dir/$exercise.impl"
-  mv "$exercise_dir/$exercise.example" "$exercise_dir/$exercise.elm"
+  exercise_name=$(basename $example_file .example.elm)
+  mv "$exercise_dir/$exercise_name.elm" "$exercise_dir/$exercise_name.impl"
+  mv "$exercise_dir/$exercise_name.example.elm" "$exercise_dir/$exercise_name.elm"
   echo '-------------------------------------------------------'
   echo "Testing $exercise"
 
   # prevent elm-test from installing dependencies
   mv $exercise_dir/elm-package.json $exercise_dir/elm-package.json.disabled
 
-  elm-test $exercise_dir/*Tests.elm
+  npm test -- $exercise_dir/Tests.elm
 
   # capture result from last command (elm-test)
   if [ $? -ne 0 ]; then
@@ -55,8 +55,8 @@ do
 
   # be kind, rewind
   mv $exercise_dir/elm-package.json.disabled $exercise_dir/elm-package.json
-  mv "$exercise_dir/$exercise.elm" "$exercise_dir/$exercise.example"
-  mv "$exercise_dir/$exercise.impl" "$exercise_dir/$exercise.elm"
+  mv "$exercise_dir/$exercise_name.elm" "$exercise_dir/$exercise_name.example.elm"
+  mv "$exercise_dir/$exercise_name.impl" "$exercise_dir/$exercise_name.elm"
 done
 
 if [ $TEST_RESULT -ne 0 ]; then
diff --git a/bin/install-elm-format b/bin/install-elm-format
index b5a7bb2..553e74f 100755
--- a/bin/install-elm-format
+++ b/bin/install-elm-format
@@ -12,7 +12,7 @@ case $(uname) in
         echo "linux";;
 esac)
 
-URL=https://github.com/avh4/elm-format/releases/download/0.4.0-alpha/elm-format-0.17-0.4.0-alpha-$OS-x64.tgz
+URL=https://github.com/avh4/elm-format/releases/download/0.5.2-alpha/elm-format-0.18-0.5.2-alpha-$OS-x64.tgz
 
 curl -L $URL | tar -xvzO > bin/elm-format
 
diff --git a/elm-package.json b/elm-package.json
index 36eec37..1366765 100644
--- a/elm-package.json
+++ b/elm-package.json
@@ -1,5 +1,5 @@
 {
-    "version": "2.0.0",
+    "version": "3.0.0",
     "summary": "Exercism problems in Elm.",
     "repository": "https://github.com/exercism/xelm.git",
     "license": "BSD3",
@@ -38,9 +38,9 @@
     ],
     "exposed-modules": [],
     "dependencies": {
-        "elm-lang/core": "4.0.0 <= v < 5.0.0",
-        "elm-community/elm-test": "2.0.0 <= v < 3.0.0",
-        "rtfeldman/node-test-runner": "2.0.0 <= v < 3.0.0"
+        "elm-lang/core": "5.0.0 <= v < 6.0.0",
+        "elm-community/elm-test": "3.0.0 <= v < 4.0.0",
+        "rtfeldman/node-test-runner": "3.0.0 <= v < 4.0.0"
     },
-    "elm-version": "0.17.0 <= v < 0.18.0"
+    "elm-version": "0.18.0 <= v < 0.19.0"
 }
diff --git a/exercises/hello-world/HelloWorld.elm b/exercises/hello-world/HelloWorld.elm
index 731e3fb..a9ff62d 100644
--- a/exercises/hello-world/HelloWorld.elm
+++ b/exercises/hello-world/HelloWorld.elm
@@ -1,9 +1,9 @@
 {-
-This is a "stub" file.  It's a little start on your solution. It's not a
-complete solution though; you have to write some code.
+   This is a "stub" file.  It's a little start on your solution. It's not a
+   complete solution though; you have to write some code.
 
-The module name is expected by the test program and must match the name of this
-file. It has to stay just the way it is.
+   The module name is expected by the test program and must match the name of this
+   file. It has to stay just the way it is.
 -}
 
 
@@ -14,12 +14,12 @@ module HelloWorld exposing (..)
 
 helloWorld : Maybe String -> String
 helloWorld name =
-  "replace with your code!"
+    "replace with your code!"
 
 
 
 {-
-When you have a working solution, REMOVE ALL THE STOCK COMMENTS.
-They're here to help you get started but they only clutter a finished solution.
-If you leave them in, nitpickers will protest!
+   When you have a working solution, REMOVE ALL THE STOCK COMMENTS.
+   They're here to help you get started but they only clutter a finished solution.
+   If you leave them in, nitpickers will protest!
 -}
diff --git a/exercises/hello-world/Example.elm b/exercises/hello-world/HelloWorld.example.elm
similarity index 100%
rename from exercises/hello-world/Example.elm
rename to exercises/hello-world/HelloWorld.example.elm
diff --git a/exercises/hello-world/package.json b/exercises/hello-world/package.json
index 9277666..38377a9 100644
--- a/exercises/hello-world/package.json
+++ b/exercises/hello-world/package.json
@@ -1,10 +1,13 @@
 {
-  "scripts": {
-    "postinstall": "elm package install -y",
-    "test": "elm-test Tests.elm"
-  },
-  "dependencies": {
-    "elm": "^0.18.0",
-    "elm-test": "^0.18.0"
-  }
+    "description": "Excercism/Elm",
+    "repository": "https://github.com/exercism/xelm.git",
+    "license": "MIT",
+    "scripts": {
+        "postinstall": "elm-package install -y",
+        "test": "elm-test Tests.elm"
+    },
+    "dependencies": {
+        "elm": "^0.18.0",
+        "elm-test": "^0.18.0"
+    }
 }
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..6dac68c
--- /dev/null
+++ b/package.json
@@ -0,0 +1,10 @@
+{
+  "scripts": {
+    "postinstall": "elm package install -y",
+    "test": "elm-test"
+  },
+  "dependencies": {
+    "elm": "^0.18.0",
+    "elm-test": "^0.18.0"
+  }
+}