diff --git a/tests/base/requirements-w-nested.txt b/tests/base/requirements-w-nested.txt
index 4d73c837..b09aa52a 100644
--- a/tests/base/requirements-w-nested.txt
+++ b/tests/base/requirements-w-nested.txt
@@ -1,3 +1,3 @@
-flask
+flask==2.0.3
 bottle
 -r requirements-common.txt
diff --git a/tests/individually/module2/requirements.txt b/tests/individually/module2/requirements.txt
index 7e106024..c09d0264 100644
--- a/tests/individually/module2/requirements.txt
+++ b/tests/individually/module2/requirements.txt
@@ -1 +1 @@
-flask
+flask==2.0.3
diff --git a/tests/non_build_pyproject/requirements.txt b/tests/non_build_pyproject/requirements.txt
index aa55d989..09764fc3 100644
--- a/tests/non_build_pyproject/requirements.txt
+++ b/tests/non_build_pyproject/requirements.txt
@@ -1,2 +1,2 @@
-flask
+flask==2.0.3
 boto3
diff --git a/tests/pipenv/Pipfile b/tests/pipenv/Pipfile
index 0d65eb75..6770a12a 100644
--- a/tests/pipenv/Pipfile
+++ b/tests/pipenv/Pipfile
@@ -3,7 +3,7 @@ url = "https://pypi.python.org/simple"
 verify_ssl = true
 
 [packages]
-Flask = "*"
+Flask = "==2.0.3"
 bottle = "*"
 boto3 = "*"