diff --git a/config/test.exs b/config/test.exs
index e116dcf..df1d66c 100644
--- a/config/test.exs
+++ b/config/test.exs
@@ -9,8 +9,8 @@ config :bcrypt_elixir, :log_rounds, 1
 # to provide built-in test partitioning in CI environment.
 # Run `mix help test` for more information.
 config :who_need_help, WhoNeedHelp.Repo,
-  username: "postgres",
-  password: "postgres",
+  username: System.get_env("DB_USER", "postgres"),
+  password: System.get_env("DB_PASSWORD"),
   hostname: System.get_env("DB_HOST", "localhost"),
   port: String.to_integer(System.get_env("DB_PORT", "5432")),
   database: "who_need_help_test#{System.get_env("MIX_TEST_PARTITION")}",
diff --git a/scripts/test.sh b/scripts/test.sh
index 7a7cad5..04bf38a 100755
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -4,6 +4,18 @@ set -eu
 ROOT=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
 cd "$ROOT"
 
+if [ ! -f "$ROOT/.env" ]; then
+  echo "Missing $ROOT/.env. Copy .env.example to .env first." >&2
+  exit 1
+fi
+
+set -a
+. "$ROOT/.env"
+set +a
+
+: "${POSTGRES_USER:?Set POSTGRES_USER in .env}"
+: "${POSTGRES_PASSWORD:?Set POSTGRES_PASSWORD in .env}"
+
 docker compose -p who_need_help up -d --wait db
 docker build --target test --tag who-need-help:test .
 
@@ -11,6 +23,8 @@ exec docker run --rm \
   --network who_need_help_internal \
   --env MIX_ENV=test \
   --env DB_HOST=db \
+  --env "DB_USER=$POSTGRES_USER" \
+  --env "DB_PASSWORD=$POSTGRES_PASSWORD" \
   --env TEST_POOL_SIZE="${TEST_POOL_SIZE:-10}" \
   who-need-help:test \
   mix test