diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e549ad1..d4ce7ce 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -27,6 +27,7 @@ jobs:
           persist-credentials: false
 
       - name: Set up Elixir
+        id: setup-beam
         uses: erlef/setup-beam@61e01a43a562a89bfc54c7f9a378ff67b03e4a21 # v1.16.0
         with:
           version-type: strict
@@ -35,20 +36,20 @@ jobs:
       - name: Restore dependencies cache
         uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3.3.2
         env:
-          cache-name: mix-deps
+          cache-key: deps
         with:
-          path: deps
-          key: ${{ runner.os }}-${{ env.cache-name }}-${{ hashFiles('**/mix.lock') }}
-          restore-keys: ${{ runner.os }}-${{ env.cache-name }}-
+          key: ${{ env.cache-key }}-${{ runner.os }}-${{ steps.setup-beam.outputs.otp-version }}-${{ steps.setup-beam.outputs.elixir-version }}-${{ hashFiles('**/mix.lock') }}-git-${{ github.sha }}
+          restore-keys: |
+            ${{ env.cache-key }}-${{ runner.os }}-${{ steps.setup-beam.outputs.otp-version }}-${{ steps.setup-beam.outputs.elixir-version }}-${{ hashFiles('**/mix.lock') }}
+            ${{ env.cache-key }}-${{ runner.os }}-${{ steps.setup-beam.outputs.otp-version }}-${{ steps.setup-beam.outputs.elixir-version }}
+          path: |
+            deps
+            _build
 
-      - name: Restore build cache
-        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3.3.2
-        env:
-          cache-name: mix-build
-        with:
-          path: _build
-          key: ${{ runner.os }}-${{ env.cache-name }}-${{ hashFiles('**/mix.lock') }}
-          restore-keys: ${{ runner.os }}-${{ env.cache-name }}-
+      - name: Install dependencies
+        run: |
+          mix local.hex --force
+          mix do deps.get, deps.compile
 
       - name: Use Node.js LTS
         uses: actions/setup-node@8f152de45cc393bb48ce5d89d36b731f54556e65 # v4
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7d4769b..5ca6959 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,64 +12,130 @@ on:
 permissions:
   contents: read
 
-env:
-  MIX_ENV: test
-
 jobs:
   # ignore the push event trigger if a PR is open for the current branch
-  prevent-duplicate-checks:
+  prevent_duplicate_checks:
     runs-on: ubuntu-latest
     steps:
-      - uses: insurgent-lab/is-in-pr-action@78ecb5daf15aca198aeb2b6f208aabd06b2cb716 # v0.1.4
+      - uses: insurgent-lab/is-in-pr-action@3e01b38aa0d2a0e51bbc84540300303ec850e80d # v0.1.5
         id: isInPR
     outputs:
       should-run: ${{ !(steps.isInPR.outputs.result == 'true' && github.event_name == 'push') }}
 
-  test:
-    name: Build and test
+  test_matrix:
+    name: Test (Elixir ${{matrix.elixir}} | OTP ${{matrix.otp}})
 
-    runs-on: ubuntu-latest
-    timeout-minutes: 5
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 10
+
+    needs: prevent_duplicate_checks
+    if: ${{ needs.prevent_duplicate_checks.outputs.should-run == 'true' }}
 
-    needs: prevent-duplicate-checks
-    if: ${{ needs.prevent-duplicate-checks.outputs.should-run == 'true' }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - elixir: 1.12.x
+            otp: 22
+            os: ubuntu-20.04
+          - elixir: 1.13.x
+            otp: 23
+            os: ubuntu-20.04
+          - elixir: 1.14.x
+            otp: 24
+            os: ubuntu-22.04
+          - elixir: 1.15.x
+            otp: 25
+            os: ubuntu-22.04
+          - elixir: 1.16.x
+            otp: 26
+            os: ubuntu-latest
+
+    env:
+      MIX_ENV: test
 
     steps:
       - name: Checkout code
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
-      - name: Set up Elixir
+      - name: Set up BEAM
+        id: setup-beam
         uses: erlef/setup-beam@61e01a43a562a89bfc54c7f9a378ff67b03e4a21 # v1.16.0
         with:
-          version-type: strict
-          version-file: .tool-versions
+          otp-version: ${{matrix.otp}}
+          elixir-version: ${{matrix.elixir}}
 
       - name: Restore dependencies cache
         uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3.3.2
         env:
-          cache-name: mix-deps
+          cache-key: deps
         with:
-          path: deps
-          key: ${{ runner.os }}-${{ env.cache-name }}-${{ hashFiles('**/mix.lock') }}
-          restore-keys: ${{ runner.os }}-${{ env.cache-name }}-
-
-      - name: Restore build cache
-        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3.3.2
-        env:
-          cache-name: mix-build
-        with:
-          path: _build
-          key: ${{ runner.os }}-${{ env.cache-name }}-${{ hashFiles('**/mix.lock') }}
-          restore-keys: ${{ runner.os }}-${{ env.cache-name }}-
+          key: ${{ env.cache-key }}-${{ runner.os }}-${{ steps.setup-beam.outputs.otp-version }}-${{ steps.setup-beam.outputs.elixir-version }}-${{ hashFiles('**/mix.lock') }}-git-${{ github.sha }}
+          restore-keys: |
+            ${{ env.cache-key }}-${{ runner.os }}-${{ steps.setup-beam.outputs.otp-version }}-${{ steps.setup-beam.outputs.elixir-version }}-${{ hashFiles('**/mix.lock') }}
+            ${{ env.cache-key }}-${{ runner.os }}-${{ steps.setup-beam.outputs.otp-version }}-${{ steps.setup-beam.outputs.elixir-version }}
+          path: |
+            deps
+            _build
 
       - name: Install dependencies
-        run: mix deps.get
+        run: |
+          mix local.hex --force
+          mix do deps.get, deps.compile
 
       - name: Check formatting
         run: mix format --check-formatted
 
-      - name: Compile code (without warning) and deps
+      - name: Compile code (without warning)
         run: mix compile --warnings-as-errors
 
       - name: Run tests
         run: mix test
+
+      # Dialyzer
+
+      - name: Restore PLTs cache
+        id: restore_plts_cache
+        uses: actions/cache/restore@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3.3.2
+        env:
+          cache-key: plts
+        with:
+          key: ${{ env.cache-key }}-${{ runner.os }}-${{ steps.setup-beam.outputs.otp-version }}-${{ steps.setup-beam.outputs.elixir-version }}-${{ hashFiles('**/mix.lock') }}-git-${{ github.sha }}
+          restore-keys: |
+            ${{ env.cache-key }}-${{ runner.os }}-${{ steps.setup-beam.outputs.otp-version }}-${{ steps.setup-beam.outputs.elixir-version }}-${{ hashFiles('**/mix.lock') }}
+            ${{ env.cache-key }}-${{ runner.os }}-${{ steps.setup-beam.outputs.otp-version }}-${{ steps.setup-beam.outputs.elixir-version }}
+          path: priv/plts
+
+      - name: Create PLTs
+        if: steps.restore_plts_cache.outputs.cache-hit != 'true'
+        run: |
+          mkdir -p priv/plts/core.plt
+          mix dialyzer --plt
+
+      - name: Save PLTs cache
+        uses: actions/cache/save@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3.3.2
+        env:
+          cache-key: plts
+        if: steps.restore_plts_cache.outputs.cache-hit != 'true'
+        with:
+          key: ${{ env.cache-key }}-${{ runner.os }}-${{ steps.setup-beam.outputs.otp-version }}-${{ steps.setup-beam.outputs.elixir-version }}-${{ hashFiles('**/mix.lock') }}-git-${{ github.sha }}
+          path: priv/plts
+
+      - name: Run dialyzer
+        run: mix dialyzer --format github
+
+  # separate job to set as required status check in branch protection
+  required_check:
+    runs-on: ubuntu-latest
+    needs:
+      - prevent_duplicate_checks
+      - test_matrix
+
+    if: ${{ !cancelled() && needs.prevent_duplicate_checks.outputs.should-run == 'true' }}
+    steps:
+      - name: All required jobs and matrix versions passed
+        if: ${{ !(contains(needs.*.result, 'failure')) }}
+        run: exit 0
+      - name: Some required jobs or matrix versions failed
+        if: ${{ contains(needs.*.result, 'failure') }}
+        run: exit 1
diff --git a/.gitignore b/.gitignore
index e993be5..d9610f4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,3 +27,7 @@ nodelix-*.tar
 
 # Node.js dependencies directory
 node_modules
+
+# Dialyzer
+/priv/plts/*.plt
+/priv/plts/*.plt.hash
diff --git a/mix.exs b/mix.exs
index 5aa3101..ba7a72c 100644
--- a/mix.exs
+++ b/mix.exs
@@ -8,9 +8,10 @@ defmodule Nodelix.MixProject do
     [
       app: :nodelix,
       version: @version,
-      elixir: "~> 1.12.3 or ~> 1.13",
+      elixir: "~> 1.12",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
+      dialyzer: dialyzer(),
       description: description(),
       package: package(),
       docs: docs(),
@@ -18,6 +19,30 @@ defmodule Nodelix.MixProject do
     ]
   end
 
+  def application do
+    [
+      extra_applications: [:crypto, :logger, inets: :optional, ssl: :optional],
+      mod: {Nodelix, []},
+      env: [default: []]
+    ]
+  end
+
+  defp deps do
+    [
+      {:gpg_ex, "1.0.0-alpha.3"},
+      {:castore, "~> 1.0"},
+      {:dialyxir, "~> 1.4", only: [:dev, :test], runtime: false},
+      {:ex_doc, ">= 0.0.0", only: :dev, runtime: false}
+    ]
+  end
+
+  defp dialyzer() do
+    [
+      plt_local_path: "priv/plts/project.plt",
+      plt_core_path: "priv/plts/core.plt"
+    ]
+  end
+
   defp description() do
     """
     Seamless Node.js in Elixir.
@@ -42,20 +67,4 @@ defmodule Nodelix.MixProject do
       extras: ["README.md", "CHANGELOG.md", "LICENSE.md"]
     ]
   end
-
-  def application do
-    [
-      extra_applications: [:crypto, :logger, inets: :optional, ssl: :optional],
-      mod: {Nodelix, []},
-      env: [default: []]
-    ]
-  end
-
-  defp deps do
-    [
-      {:gpg_ex, "1.0.0-alpha.3"},
-      {:castore, "~> 1.0"},
-      {:ex_doc, ">= 0.0.0", only: :dev, runtime: false}
-    ]
-  end
 end
diff --git a/mix.lock b/mix.lock
index 2829057..43a8dc5 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,7 +1,9 @@
 %{
   "castore": {:hex, :castore, "1.0.4", "ff4d0fb2e6411c0479b1d965a814ea6d00e51eb2f58697446e9c41a97d940b28", [:mix], [], "hexpm", "9418c1b8144e11656f0be99943db4caf04612e3eaecefb5dae9a2a87565584f8"},
+  "dialyxir": {:hex, :dialyxir, "1.4.2", "764a6e8e7a354f0ba95d58418178d486065ead1f69ad89782817c296d0d746a5", [:mix], [{:erlex, ">= 0.2.6", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "516603d8067b2fd585319e4b13d3674ad4f314a5902ba8130cd97dc902ce6bbd"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.38", "b42252eddf63bda05554ba8be93a1262dc0920c721f1aaf989f5de0f73a2e367", [:mix], [], "hexpm", "2cd0907795aaef0c7e8442e376633c5b3bd6edc8dbbdc539b22f095501c1cdb6"},
   "elixir_uuid": {:hex, :elixir_uuid, "1.2.1", "dce506597acb7e6b0daeaff52ff6a9043f5919a4c3315abb4143f0b00378c097", [:mix], [], "hexpm", "f7eba2ea6c3555cea09706492716b0d87397b88946e6380898c2889d68585752"},
+  "erlex": {:hex, :erlex, "0.2.6", "c7987d15e899c7a2f34f5420d2a2ea0d659682c06ac607572df55a43753aa12e", [:mix], [], "hexpm", "2ed2e25711feb44d52b17d2780eabf998452f6efda104877a3881c2f8c0c0c75"},
   "ex_doc": {:hex, :ex_doc, "0.30.9", "d691453495c47434c0f2052b08dd91cc32bc4e1a218f86884563448ee2502dd2", [:mix], [{:earmark_parser, "~> 1.4.31", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1", [hex: :makeup_erlang, repo: "hexpm", optional: false]}], "hexpm", "d7aaaf21e95dc5cddabf89063327e96867d00013963eadf2c6ad135506a8bc10"},
   "gpg_ex": {:hex, :gpg_ex, "1.0.0-alpha.3", "d5860bb91b8c833441770f38707ad0556074ab5772f8e1dfc71ddedf7cae9e78", [:mix], [{:elixir_uuid, "~> 1.2", [hex: :elixir_uuid, repo: "hexpm", optional: false]}], "hexpm", "748d4283f0a62836afa07d27944f54c29cd6f02bd238ab1f72534f5273745630"},
   "makeup": {:hex, :makeup, "1.1.1", "fa0bc768698053b2b3869fa8a62616501ff9d11a562f3ce39580d60860c3a55e", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "5dc62fbdd0de44de194898b6710692490be74baa02d9d108bc29f007783b0b48"},