diff --git a/part1/Main.elm b/part1/Main.elm
index 56a2cad..43afced 100644
--- a/part1/Main.elm
+++ b/part1/Main.elm
@@ -1,37 +1,33 @@
-module Main (..) where
+module Main exposing (..)
 
 import Html exposing (..)
 import Html.Attributes exposing (..)
 
 
 model =
-  { result =
-      { id = 1
-      , name = "TheSeamau5/elm-checkerboardgrid-tutorial"
-      , stars = 66
-      }
-  }
+    { result =
+        { id = 1
+        , name = "TheSeamau5/elm-checkerboardgrid-tutorial"
+        , stars = 66
+        }
+    }
 
 
 view model =
-  div
-    [ class "content" ]
-    [ header
-        []
-        [ -- TODO add the equivalent of <h1>ElmHub</h1> right before the tagline
-          span [ class "tagline" ] [ text "“Like GitHub, but for Elm things.”" ]
-        ]
-    , ul
-        [ class "results" ]
-        [ li
-            []
-            [ span [ class "star-count" ] [{- TODO display the number of stars -}]
-              -- TODO use the model to put a link here that points to
-              -- https://github.com/TheSeamau5/elm-checkerboardgrid-tutorial
+    div [ class "content" ]
+        [ header []
+            [ -- TODO add the equivalent of <h1>ElmHub</h1> right before the tagline
+              span [ class "tagline" ] [ text "“Like GitHub, but for Elm things.”" ]
+            ]
+        , ul [ class "results" ]
+            [ li []
+                [ span [ class "star-count" ] [{- TODO display the number of stars -}]
+                  -- TODO use the model to put a link here that points to
+                  -- https://github.com/TheSeamau5/elm-checkerboardgrid-tutorial
+                ]
             ]
         ]
-    ]
 
 
 main =
-  view model
+    view model
diff --git a/part1/elm-package.json b/part1/elm-package.json
index 068fa12..3a09e24 100644
--- a/part1/elm-package.json
+++ b/part1/elm-package.json
@@ -8,8 +8,8 @@
     ],
     "exposed-modules": [],
     "dependencies": {
-        "elm-lang/core": "3.0.0 <= v < 4.0.0",
-        "evancz/elm-html": "4.0.0 <= v < 5.0.0"
+        "elm-lang/core": "4.0.1 <= v < 5.0.0",
+        "elm-lang/html": "1.0.0 <= v < 2.0.0"
     },
-    "elm-version": "0.16.0 <= v < 0.17.0"
+    "elm-version": "0.17.0 <= v < 0.18.0"
 }
diff --git a/part2/Main.elm b/part2/Main.elm
index 8bad4aa..a7cbf53 100644
--- a/part2/Main.elm
+++ b/part2/Main.elm
@@ -1,84 +1,79 @@
-module Main (..) where
+module Main exposing (..)
 
 import Html exposing (..)
 import Html.Attributes exposing (..)
 
 
 type alias Model =
-  { query : String
-  , results : List SearchResult
-  }
+    { query : String
+    , results : List SearchResult
+    }
 
 
 type alias SearchResult =
-  { id : ResultId
-  , name : String
-  , stars : Int
-  }
+    { id : ResultId
+    , name : String
+    , stars : Int
+    }
 
 
 type alias ResultId =
-  Int
+    Int
 
 
 {-| TODO add a type annotation to this value
 -}
 model =
-  { query = "tutorial"
-  , results =
-      [ { id = 1
-        , name = "TheSeamau5/elm-checkerboardgrid-tutorial"
-        , stars = 66
-        }
-      , { id = 2
-        , name = "grzegorzbalcerek/elm-by-example"
-        , stars = 41
-        }
-      , { id = 3
-        , name = "sporto/elm-tutorial-app"
-        , stars = 35
-        }
-      , { id = 4
-        , name = "jvoigtlaender/Elm-Tutorium"
-        , stars = 10
-        }
-      , { id = 5
-        , name = "sporto/elm-tutorial-assets"
-        , stars = 7
-        }
-      ]
-  }
+    { query = "tutorial"
+    , results =
+        [ { id = 1
+          , name = "TheSeamau5/elm-checkerboardgrid-tutorial"
+          , stars = 66
+          }
+        , { id = 2
+          , name = "grzegorzbalcerek/elm-by-example"
+          , stars = 41
+          }
+        , { id = 3
+          , name = "sporto/elm-tutorial-app"
+          , stars = 35
+          }
+        , { id = 4
+          , name = "jvoigtlaender/Elm-Tutorium"
+          , stars = 10
+          }
+        , { id = 5
+          , name = "sporto/elm-tutorial-assets"
+          , stars = 7
+          }
+        ]
+    }
 
 
 {-| TODO add a type annotation to this function
 -}
 view model =
-  div
-    [ class "content" ]
-    [ header
-        []
-        [ h1 [] [ text "ElmHub" ]
-        , span [ class "tagline" ] [ text "“Like GitHub, but for Elm things.”" ]
+    div [ class "content" ]
+        [ header []
+            [ h1 [] [ text "ElmHub" ]
+            , span [ class "tagline" ] [ text "“Like GitHub, but for Elm things.”" ]
+            ]
+        , ul [ class "results" ]
+            [{- TODO use model.results and viewSearchResults to display results -}]
         ]
-    , ul
-        [ class "results" ]
-        [{- TODO use model.results and viewSearchResults to display results -}]
-    ]
 
 
 {-| TODO add a type annotation to this function
 -}
 viewSearchResult result =
-  li
-    []
-    [ span [ class "star-count" ] [ text (toString result.stars) ]
-    , a
-        [ href ("https://github.com/" ++ result.name), target "_blank" ]
-        [ text result.name ]
-    ]
+    li []
+        [ span [ class "star-count" ] [ text (toString result.stars) ]
+        , a [ href ("https://github.com/" ++ result.name), target "_blank" ]
+            [ text result.name ]
+        ]
 
 
 {-| TODO add a type annotation to this value
 -}
 main =
-  view model
+    view model
diff --git a/part2/elm-package.json b/part2/elm-package.json
index 068fa12..3a09e24 100644
--- a/part2/elm-package.json
+++ b/part2/elm-package.json
@@ -8,8 +8,8 @@
     ],
     "exposed-modules": [],
     "dependencies": {
-        "elm-lang/core": "3.0.0 <= v < 4.0.0",
-        "evancz/elm-html": "4.0.0 <= v < 5.0.0"
+        "elm-lang/core": "4.0.1 <= v < 5.0.0",
+        "elm-lang/html": "1.0.0 <= v < 2.0.0"
     },
-    "elm-version": "0.16.0 <= v < 0.17.0"
+    "elm-version": "0.17.0 <= v < 0.18.0"
 }
diff --git a/part3/Main.elm b/part3/Main.elm
index f69791a..494979d 100644
--- a/part3/Main.elm
+++ b/part3/Main.elm
@@ -1,103 +1,96 @@
-module Main (..) where
+module Main exposing (..)
 
 import Html exposing (..)
+import Html.App
 import Html.Attributes exposing (..)
-import Html.Events exposing (..)
-import Auth
-import StartApp.Simple as StartApp
-import Signal exposing (Address)
 
 
 type alias Model =
-  { query : String
-  , results : List SearchResult
-  }
+    { query : String
+    , results : List SearchResult
+    }
 
 
 type alias SearchResult =
-  { id : ResultId
-  , name : String
-  , stars : Int
-  }
+    { id : ResultId
+    , name : String
+    , stars : Int
+    }
 
 
 type alias ResultId =
-  Int
+    Int
 
 
 initialModel : Model
 initialModel =
-  { query = "tutorial"
-  , results =
-      [ { id = 1
-        , name = "TheSeamau5/elm-checkerboardgrid-tutorial"
-        , stars = 66
-        }
-      , { id = 2
-        , name = "grzegorzbalcerek/elm-by-example"
-        , stars = 41
-        }
-      , { id = 3
-        , name = "sporto/elm-tutorial-app"
-        , stars = 35
-        }
-      , { id = 4
-        , name = "jvoigtlaender/Elm-Tutorium"
-        , stars = 10
-        }
-      , { id = 5
-        , name = "sporto/elm-tutorial-assets"
-        , stars = 7
-        }
-      ]
-  }
-
-
-view : Address Action -> Model -> Html
-view address model =
-  div
-    [ class "content" ]
-    [ header
-        []
-        [ h1 [] [ text "ElmHub" ]
-        , span [ class "tagline" ] [ text "“Like GitHub, but for Elm things.”" ]
+    { query = "tutorial"
+    , results =
+        [ { id = 1
+          , name = "TheSeamau5/elm-checkerboardgrid-tutorial"
+          , stars = 66
+          }
+        , { id = 2
+          , name = "grzegorzbalcerek/elm-by-example"
+          , stars = 41
+          }
+        , { id = 3
+          , name = "sporto/elm-tutorial-app"
+          , stars = 35
+          }
+        , { id = 4
+          , name = "jvoigtlaender/Elm-Tutorium"
+          , stars = 10
+          }
+        , { id = 5
+          , name = "sporto/elm-tutorial-assets"
+          , stars = 7
+          }
         ]
-    , ul
-        [ class "results" ]
-        (List.map (viewSearchResult address) model.results)
-    ]
-
-
-viewSearchResult : Address Action -> SearchResult -> Html
-viewSearchResult address result =
-  li
-    []
-    [ span [ class "star-count" ] [ text (toString result.stars) ]
-    , a
-        [ href ("https://github.com/" ++ result.name), target "_blank" ]
-        [ text result.name ]
-    , button
-        -- TODO add an onClick handler that sends a DELETE_BY_ID action
-        [ class "hide-result" ]
-        [ text "X" ]
-    ]
-
-
-type alias Action =
-  { -- TODO implement this type alias
-  }
-
-
-update : Action -> Model -> Model
-update action model =
-  -- TODO if we receive a DELETE_BY_ID action,
-  -- build a new model without the given ID present anymore.
-  model
-
-
-main =
-  StartApp.start
-    { view = view
-    , update = update
-    , model = initialModel
     }
+
+
+view : Model -> Html Msg
+view model =
+    div [ class "content" ]
+        [ header []
+            [ h1 [] [ text "ElmHub" ]
+            , span [ class "tagline" ] [ text "“Like GitHub, but for Elm things.”" ]
+            ]
+        , ul [ class "results" ]
+            (List.map viewSearchResult model.results)
+        ]
+
+
+viewSearchResult : SearchResult -> Html Msg
+viewSearchResult result =
+    li []
+        [ span [ class "star-count" ] [ text (toString result.stars) ]
+        , a [ href ("https://github.com/" ++ result.name), target "_blank" ]
+            [ text result.name ]
+        , button
+            -- TODO add an onClick handler that sends a DELETE_BY_ID action
+            [ class "hide-result" ]
+            [ text "X" ]
+        ]
+
+
+type alias Msg =
+    { -- TODO implement this type alias
+    }
+
+
+update : Msg -> Model -> Model
+update msg model =
+    -- TODO if we receive a DELETE_BY_ID message,
+    -- build a new model without the given ID present anymore.
+    model
+
+
+main : Program Never
+main =
+    Html.App.beginnerProgram
+        { view = view
+        , update = update
+        , model = initialModel
+        }
diff --git a/part3/elm-package.json b/part3/elm-package.json
index a500a2f..3a09e24 100644
--- a/part3/elm-package.json
+++ b/part3/elm-package.json
@@ -8,10 +8,8 @@
     ],
     "exposed-modules": [],
     "dependencies": {
-        "elm-lang/core": "3.0.0 <= v < 4.0.0",
-        "evancz/elm-effects": "2.0.0 <= v < 3.0.0",
-        "evancz/elm-html": "4.0.0 <= v < 5.0.0",
-        "evancz/start-app": "2.0.0 <= v < 3.0.0"
+        "elm-lang/core": "4.0.1 <= v < 5.0.0",
+        "elm-lang/html": "1.0.0 <= v < 2.0.0"
     },
-    "elm-version": "0.16.0 <= v < 0.17.0"
+    "elm-version": "0.17.0 <= v < 0.18.0"
 }