diff --git a/graphql_server/__init__.py b/graphql_server/__init__.py
index 8942332..239a1d4 100644
--- a/graphql_server/__init__.py
+++ b/graphql_server/__init__.py
@@ -255,6 +255,10 @@ def get_response(
         if not params.query:
             raise HttpQueryError(400, "Must provide query string.")
 
+        # Sanity check query
+        if not isinstance(params.query, str):
+            raise HttpQueryError(400, "Unexpected query type.")
+
         schema_validation_errors = validate_schema(schema)
         if schema_validation_errors:
             return ExecutionResult(data=None, errors=schema_validation_errors)
diff --git a/setup.py b/setup.py
index 3758a20..e3f769e 100644
--- a/setup.py
+++ b/setup.py
@@ -1,10 +1,7 @@
 from re import search
 from setuptools import setup, find_packages
 
-install_requires = [
-    "graphql-core>=3.1.0,<4",
-    "typing-extensions>=3.7.4,<4"
-]
+install_requires = ["graphql-core>=3.1.0,<4", "typing-extensions>=3.7.4,<4"]
 
 tests_requires = [
     "pytest>=5.4,<5.5",
@@ -23,11 +20,11 @@
 ] + tests_requires
 
 install_flask_requires = [
-    "flask>=0.7.0",
+    "flask>=0.7.0<1",
 ]
 
 install_sanic_requires = [
-    "sanic>=20.3.0",
+    "sanic>=20.3.0,<21",
 ]
 
 install_webob_requires = [
@@ -38,17 +35,16 @@
     "aiohttp>=3.5.0,<4",
 ]
 
-install_quart_requires = [
-    "quart>=0.6.15"
-]
+install_quart_requires = ["quart>=0.6.15,<1"]
 
-install_all_requires = \
-    install_requires + \
-    install_flask_requires + \
-    install_sanic_requires + \
-    install_webob_requires + \
-    install_aiohttp_requires + \
-    install_quart_requires
+install_all_requires = (
+    install_requires
+    + install_flask_requires
+    + install_sanic_requires
+    + install_webob_requires
+    + install_aiohttp_requires
+    + install_quart_requires
+)
 
 with open("graphql_server/version.py") as version_file:
     version = search('version = "(.*)"', version_file.read()).group(1)
diff --git a/tests/sanic/app.py b/tests/sanic/app.py
index f5a74cf..6966b1e 100644
--- a/tests/sanic/app.py
+++ b/tests/sanic/app.py
@@ -8,6 +8,9 @@
 from .schema import Schema
 
 
+Sanic.test_mode = True
+
+
 def create_app(path="/graphql", **kwargs):
     app = Sanic(__name__)
     app.debug = True
diff --git a/tests/test_query.py b/tests/test_query.py
index 70f49ac..c4f6a43 100644
--- a/tests/test_query.py
+++ b/tests/test_query.py
@@ -495,8 +495,10 @@ def test_handles_errors_caused_by_a_lack_of_query():
 
 
 def test_handles_errors_caused_by_invalid_query_type():
-    results, params = run_http_query(schema, "get", dict(query=42))
-    assert results == [(None, [{"message": "Must provide Source. Received: 42."}])]
+    with raises(HttpQueryError) as exc_info:
+        results, params = run_http_query(schema, "get", dict(query=42))
+
+    assert exc_info.value == HttpQueryError(400, "Unexpected query type.")
 
 
 def test_handles_batch_correctly_if_is_disabled():