diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 49c43ed6..627c10f5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -52,7 +52,7 @@ jobs:
       fail-fast: false
       matrix:
         elixirbase:
-          - "1.14.5-erlang-23.3.4.9-alpine-3.16.9"
+          - "1.15.6-erlang-25.3.2.6-alpine-3.18.4"
         postgres:
           - "16.2-alpine"
           - "11.11-alpine"
@@ -61,7 +61,7 @@ jobs:
         pool_count:
           - "1"
         include:
-          - elixirbase: "1.14.5-erlang-23.3.4.9-alpine-3.16.9"
+          - elixirbase: "1.15.6-erlang-25.3.2.6-alpine-3.18.4"
             postgres: "16.2-alpine"
             pool_count: "4"
     steps:
@@ -79,7 +79,7 @@ jobs:
       fail-fast: false
       matrix:
         elixirbase:
-          - "1.14.5-erlang-23.3.4.9-alpine-3.16.9"
+          - "1.15.6-erlang-25.3.2.6-alpine-3.18.4"
         mysql:
           - "5.7"
           - "8.0"
@@ -96,7 +96,7 @@ jobs:
       fail-fast: false
       matrix:
         elixirbase:
-          - "1.14.5-erlang-23.3.4.9-alpine-3.16.9"
+          - "1.15.6-erlang-25.3.2.6-alpine-3.18.4"
         mssql:
           - "2019"
           - "2022"
diff --git a/lib/ecto/adapters/postgres/connection.ex b/lib/ecto/adapters/postgres/connection.ex
index c7f6282b..b2938e9e 100644
--- a/lib/ecto/adapters/postgres/connection.ex
+++ b/lib/ecto/adapters/postgres/connection.ex
@@ -1991,7 +1991,7 @@ if Code.ensure_loaded?(Postgrex) do
 
     defp bitstring_literal(value) do
       size = bit_size(value)
-      <<val::size(size)>> = value
+      <<val::size(^size)>> = value
 
       [?b, ?', val |> Integer.to_string(2) |> String.pad_leading(size, ["0"]), ?']
     end
diff --git a/mix.exs b/mix.exs
index 0013472e..2fa8d58e 100644
--- a/mix.exs
+++ b/mix.exs
@@ -9,9 +9,10 @@ defmodule EctoSQL.MixProject do
     [
       app: :ecto_sql,
       version: @version,
-      elixir: "~> 1.14",
+      elixir: "~> 1.15",
       deps: deps(),
       test_paths: test_paths(System.get_env("ECTO_ADAPTER")),
+      test_ignore_filters: [&String.starts_with?(&1, "test/support/")],
       xref: [
         exclude: [
           MyXQL,
@@ -30,7 +31,6 @@ defmodule EctoSQL.MixProject do
         "test.adapters": &test_adapters/1,
         "test.as_a_dep": &test_as_a_dep/1
       ],
-      preferred_cli_env: ["test.all": :test, "test.adapters": :test],
 
       # Hex
       description: "SQL-based adapters for Ecto and database migrations",
@@ -50,6 +50,10 @@ defmodule EctoSQL.MixProject do
     ]
   end
 
+  def cli do
+    [preferred_envs: ["test.all": :test, "test.adapters": :test]]
+  end
+
   defp deps do
     [
       ecto_dep(),