diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fbf7b01..a2912a7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix:
         # Minimum and maximum supported versions
-        versions: [{ elixir: '1.14.0', otp: '25' }, { elixir: '1.18.0', otp: '26.2.5' }]
+        versions: [{ elixir: '1.14.0', otp: '25' }, { elixir: '1.19.4', otp: '28' }]
     steps:
       - uses: actions/checkout@v4
       - uses: erlef/setup-beam@v1
@@ -17,4 +17,6 @@ jobs:
       - run: mix deps.unlock --all # compiles and runs tests against latest versions of dependencies
       - run: mix deps.get
       - run: mix test
+      - if: matrix.versions.elixir == '1.19.4'
+        run: mix format --check-formatted
       - run: mix dialyzer --format github
diff --git a/lib/split/sockets/pool.ex b/lib/split/sockets/pool.ex
index add2881..7340d23 100644
--- a/lib/split/sockets/pool.ex
+++ b/lib/split/sockets/pool.ex
@@ -139,14 +139,15 @@ defmodule Split.Sockets.Pool do
   def handle_checkin(checkin, _from, _old_conn, {_opts, metrics_ref} = pool_state) do
     PoolMetrics.update(metrics_ref, {:connections_in_use, -1})
 
-    with {:ok, conn} <- checkin,
-         true <- Conn.is_open?(conn) do
-      {:ok, conn, pool_state}
-    else
-      _ ->
-        Logger.debug(
-          "Error checking in socket #{inspect(checkin)} to the pool. Socket is closed."
-        )
+    case checkin do
+      {:ok, conn} ->
+        {:ok, conn, pool_state}
+
+      :closed ->
+        {:remove, :closed, pool_state}
+
+      other ->
+        Logger.debug("Error checking in socket #{inspect(other)} to the pool. Socket is closed.")
 
         {:remove, :closed, pool_state}
     end
diff --git a/test/test_helper.exs b/test/test_helper.exs
index b158c93..2b9b62e 100644
--- a/test/test_helper.exs
+++ b/test/test_helper.exs
@@ -1,5 +1,5 @@
 ExUnit.start()
 
-# supress logging output in  the console while testing
+# suppress logging output in the console while testing
 # we can still capture the log output in tests using `capture_log`
 Logger.configure_backend(:console, level: :error)