diff --git a/poetry.lock b/poetry.lock
index 01bdf58..3802eba 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1391,4 +1391,4 @@ docs = ["flask-sphinx-themes", "myst-parser", "sphinx", "sphinxcontrib-httpdomai
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8"
-content-hash = "8258476b78b4f16a2bcedcc204697c27143caa715b36eb5e4e5488079ceb58c1"
+content-hash = "71de7fa715cabd253c98b7d00f2d9607f277df87a1ef6abc851887ad22a0ed06"
diff --git a/pyproject.toml b/pyproject.toml
index d311a64..dd88f7c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,7 +35,7 @@ include = [
 
 [tool.poetry.dependencies]
 python = "^3.8"
-flask = "^0.12.2 || ^1.0.0 || ^2.0.0 || ^3.0.0"
+flask = ">=0.12.2,<4.0.0"
 authlib = "^1.2.0"
 requests = "^2.20.0"
 blinker = "^1.4.0"