diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 68f3e7f..fe47ace 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,8 +10,12 @@ on:
 
 jobs:
   test:
-    name: Run tests
     runs-on: ubuntu-latest
+    name: Elixir ${{ matrix.elixir }} / OTP ${{ matrix.otp }}
+    strategy:
+      matrix:
+        otp: ['26', '27']
+        elixir: ['1.17', '1.18']
     steps:
       - name: Checkout
         uses: actions/checkout@v3
@@ -20,8 +24,8 @@ jobs:
         uses: erlef/setup-beam@v1
         id: setup-elixir
         with:
-          version-type: strict
-          version-file: .tool-versions
+          elixir-version: ${{ matrix.elixir }}
+          otp-version: ${{ matrix.otp }}
 
       - name: Restore the cache
         uses: actions/cache@v3
@@ -29,11 +33,10 @@ jobs:
           path: |
             deps
             _build
-            dialyzer
-          key: |
-            ${{ runner.os }}-${{ steps.setup-elixir.outputs.elixir-version }}-${{ steps.setup-elixir.outputs.otp-version }}-mixlockhash-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+            priv/plts
+          key: deps-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-${{ hashFiles('**/mix.lock') }}
           restore-keys: |
-            ${{ runner.os }}-${{ steps.setup-elixir.outputs.elixir-version }}-${{ steps.setup-elixir.outputs.otp-version }}-mixlockhash-
+            deps-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}
 
       - name: Run CI
         run: |
diff --git a/.gitignore b/.gitignore
index 2e20f0c..43d994a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,4 +29,5 @@ z_stream-*.tar
 .elixir_ls
 
 # Dialyzer generated PLT files
-/dialyzer
\ No newline at end of file
+/priv/plts/*.plt
+/priv/plts/*.plt.hash
diff --git a/.tool-versions b/.tool-versions
index ab22093..f653a37 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
-erlang 26.2.5.1
-elixir 1.17.1-otp-26
+erlang 27.2
+elixir 1.18.0-otp-27
diff --git a/mix.exs b/mix.exs
index fd5c27e..2a72e28 100644
--- a/mix.exs
+++ b/mix.exs
@@ -33,7 +33,8 @@ defmodule ZStream.MixProject do
 
   defp dialyzer do
     [
-      plt_file: {:no_warn, "dialyzer/dialyzer.plt"},
+      plt_local_path: "priv/plts/project.plt",
+      plt_core_path: "priv/plts/core.plt",
       plt_add_apps: [:ex_unit, :mix]
     ]
   end
@@ -97,7 +98,10 @@ defmodule ZStream.MixProject do
       {:ex_doc, "~> 0.30.8", only: :dev, runtime: false},
       {:ezstd, "~> 1.1"},
       {:host_triple, "~> 0.1.0"},
-      {:lz4, git: "https://github.com/rabbitmq/lz4-erlang", tag: "v1.9.4.1", manager: :make},
+      {:lz4,
+       git: "https://github.com/rabbitmq/lz4-erlang",
+       ref: "100296252d31cc4847ba35d0c8efae3569bd66cb",
+       manager: :make},
       {:sobelow, "~> 0.13.0", only: [:dev, :test], runtime: false},
       {:stream_data, "~> 1.0", only: [:dev, :test]}
     ]
diff --git a/mix.lock b/mix.lock
index 99f3b23..923dcc0 100644
--- a/mix.lock
+++ b/mix.lock
@@ -11,7 +11,7 @@
   "file_system": {:hex, :file_system, "1.0.0", "b689cc7dcee665f774de94b5a832e578bd7963c8e637ef940cd44327db7de2cd", [:mix], [], "hexpm", "6752092d66aec5a10e662aefeed8ddb9531d79db0bc145bb8c40325ca1d8536d"},
   "host_triple": {:hex, :host_triple, "0.1.0", "cc5dc084cb5e4d8122cb33aefe76977f3c25319278c1011868b7cee2eba98fd4", [:rebar3], [], "hexpm", "26fee396a7c0e1d66115e74638a795366496b59bf13f474f3ae1c4491fd14fc5"},
   "jason": {:hex, :jason, "1.4.4", "b9226785a9aa77b6857ca22832cffa5d5011a667207eb2a0ad56adb5db443b8a", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "c5eb0cab91f094599f94d55bc63409236a8ec69a21a67814529e8d5f6cc90b3b"},
-  "lz4": {:git, "https://github.com/rabbitmq/lz4-erlang", "fb3ccc2449253f01a278604cc6445bbfb5a7679f", [tag: "v1.9.4.1"]},
+  "lz4": {:git, "https://github.com/rabbitmq/lz4-erlang", "100296252d31cc4847ba35d0c8efae3569bd66cb", [ref: "100296252d31cc4847ba35d0c8efae3569bd66cb"]},
   "makeup": {:hex, :makeup, "1.1.2", "9ba8837913bdf757787e71c1581c21f9d2455f4dd04cfca785c70bbfff1a76a3", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "cce1566b81fbcbd21eca8ffe808f33b221f9eee2cbc7a1706fc3da9ff18e6cac"},
   "makeup_elixir": {:hex, :makeup_elixir, "0.16.2", "627e84b8e8bf22e60a2579dad15067c755531fea049ae26ef1020cad58fe9578", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "41193978704763f6bbe6cc2758b84909e62984c7752b3784bd3c218bb341706b"},
   "makeup_erlang": {:hex, :makeup_erlang, "0.1.5", "e0ff5a7c708dda34311f7522a8758e23bfcd7d8d8068dc312b5eb41c6fd76eba", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "94d2e986428585a21516d7d7149781480013c56e30c6a233534bedf38867a59a"},
diff --git a/test/z_stream_test.exs b/test/z_stream_test.exs
deleted file mode 100644
index ef6e714..0000000
--- a/test/z_stream_test.exs
+++ /dev/null
@@ -1,8 +0,0 @@
-defmodule ZStreamTest do
-  use ExUnit.Case
-  doctest ZStream
-
-  test "greets the world" do
-    assert ZStream.hello() == :world
-  end
-end