diff --git a/config/config.exs b/config/config.exs
index 4cdf8f8..1cf8a1d 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -2,9 +2,6 @@ import Config
 
 config :nodelix,
   version: "20.10.0",
-  npm: [
-    args: ["_build/dev/nodejs/versions/20.10.0/bin/npm"]
-  ],
-  another: [
+  test_profile: [
     args: ["--version"]
   ]
diff --git a/lib/mix/tasks/nodelix.ex b/lib/mix/tasks/nodelix.ex
index c5e8312..d9a048f 100644
--- a/lib/mix/tasks/nodelix.ex
+++ b/lib/mix/tasks/nodelix.ex
@@ -38,6 +38,7 @@ defmodule Mix.Tasks.Nodelix do
   @dialyzer {:no_missing_calls, run: 1}
 
   @impl Mix.Task
+  @spec run([String.t()]) :: :ok
   def run(args) do
     switches = [profile: :string, runtime_config: :boolean]
 
diff --git a/lib/mix/tasks/nodelix.install.ex b/lib/mix/tasks/nodelix.install.ex
index 8e8ce3e..3b0efc0 100644
--- a/lib/mix/tasks/nodelix.install.ex
+++ b/lib/mix/tasks/nodelix.install.ex
@@ -12,7 +12,7 @@ defmodule Mix.Tasks.Nodelix.Install do
   > API _should not_ be considered stable, and using a pinned version is _recommended_.
 
       $ mix nodelix.install
-      $ mix nodelix.install --if-missing
+      $ mix nodelix.install --force
 
   By default, it installs #{VersionManager.latest_lts_version()} but you
   can configure it in your config files, such as:
@@ -24,8 +24,7 @@ defmodule Mix.Tasks.Nodelix.Install do
     - `--runtime-config` - load the runtime configuration
       before executing command
 
-    - `--if-missing` - install only if the given version
-      does not exist
+    - `--force` - install even if the given version is already present
   """
 
   @shortdoc "Installs Node.js"
@@ -33,8 +32,9 @@ defmodule Mix.Tasks.Nodelix.Install do
   @dialyzer {:no_missing_calls, run: 1}
 
   @impl Mix.Task
+  @spec run([String.t()]) :: :ok
   def run(args) do
-    valid_options = [runtime_config: :boolean, if_missing: :boolean, assets: :boolean]
+    valid_options = [runtime_config: :boolean, force: :boolean, assets: :boolean]
 
     {opts, archive_base_url} =
       case OptionParser.parse_head!(args, strict: valid_options) do
@@ -51,7 +51,7 @@ defmodule Mix.Tasks.Nodelix.Install do
               mix nodelix.install
               mix nodelix.install 'https://nodejs.org/dist/v$version/node-v$version-$target.$ext'
               mix nodelix.install --runtime-config
-              mix nodelix.install --if-missing
+              mix nodelix.install --force
           """)
       end
 
@@ -59,7 +59,7 @@ defmodule Mix.Tasks.Nodelix.Install do
 
     configured_version = Nodelix.configured_version()
 
-    if opts[:if_missing] && VersionManager.is_installed?(configured_version) do
+    if VersionManager.is_installed?(configured_version) and !opts[:force] do
       :ok
     else
       if function_exported?(Mix, :ensure_application!, 1) do
diff --git a/lib/mix/tasks/nodelix.npm.ex b/lib/mix/tasks/nodelix.npm.ex
index ee302fb..85f4488 100644
--- a/lib/mix/tasks/nodelix.npm.ex
+++ b/lib/mix/tasks/nodelix.npm.ex
@@ -25,9 +25,9 @@ defmodule Mix.Tasks.Nodelix.Npm do
   alias Nodelix.VersionManager
 
   @shortdoc "Invokes npm with the provided arguments"
-  @dialyzer {:no_missing_calls, run: 1}
 
   @impl Mix.Task
+  @spec run([String.t()]) :: :ok
   def run(args) do
     npm_path = VersionManager.bin_path(:npm, Nodelix.configured_version())
 
diff --git a/test/nodelix_test.exs b/test/nodelix_test.exs
index d5f7d76..eb24f2c 100644
--- a/test/nodelix_test.exs
+++ b/test/nodelix_test.exs
@@ -15,33 +15,37 @@ defmodule NodelixTest do
 
   test "run without profile" do
     assert ExUnit.CaptureIO.capture_io(fn ->
-             assert Mix.Task.run("nodelix", ["--version"]) == :ok
+             assert Mix.Task.rerun("nodelix", ["--version"]) == :ok
            end) =~ @version
   end
 
   test "run on another profile" do
     assert ExUnit.CaptureIO.capture_io(fn ->
-             assert Mix.Task.run("nodelix", ["--profile", "another", "--version"]) == :ok
+             assert Mix.Task.rerun("nodelix", ["--profile", "test_profile"]) == :ok
            end) =~ @version
   end
 
-  test "updates on install" do
-    Application.put_env(:nodelix, :version, "20.9.0")
-    Mix.Task.rerun("nodelix.install", ["--if-missing"])
+  test "installs and runs multiple versions" do
+    Application.put_env(:nodelix, :version, "18.18.2")
+    Mix.Task.rerun("nodelix.install")
 
     assert ExUnit.CaptureIO.capture_io(fn ->
-             assert Mix.Task.run("nodelix", ["--version"]) == :ok
-           end) =~ "20.9.0"
+             assert Mix.Task.rerun("nodelix", ["--version"]) == :ok
+           end) =~ "18.18.2"
 
-    Application.delete_env(:nodelix, :version)
-
-    Mix.Task.rerun("nodelix.install", ["--if-missing"])
+    Application.put_env(:nodelix, :version, @version)
 
     assert ExUnit.CaptureIO.capture_io(fn ->
-             assert Mix.Task.run("nodelix", ["--version"]) == :ok
+             assert Mix.Task.rerun("nodelix", ["--version"]) == :ok
            end) =~ @version
   end
 
+  test "re-installs with force flag" do
+    assert ExUnit.CaptureLog.capture_log(fn ->
+             assert Mix.Task.rerun("nodelix.install", ["--force"]) == :ok
+           end) =~ "Succesfully installed Node.js v#{@version}"
+  end
+
   test "installs with custom URL" do
     assert :ok =
              Mix.Task.rerun("nodelix.install", [