diff --git a/modules/openapi-generator/src/main/resources/python-flask/requirements.mustache b/modules/openapi-generator/src/main/resources/python-flask/requirements.mustache
index 8161173186d..3a3d56ed56d 100644
--- a/modules/openapi-generator/src/main/resources/python-flask/requirements.mustache
+++ b/modules/openapi-generator/src/main/resources/python-flask/requirements.mustache
@@ -1,6 +1,8 @@
 connexion[swagger-ui] >= 2.6.0; python_version>="3.6"
 # 2.3 is the last version that supports python 3.4-3.5
 connexion[swagger-ui] <= 2.3.0; python_version=="3.5" or python_version=="3.4"
+# prevent breaking dependencies from advent of connexion>=3.0
+connexion[swagger-ui] <= 2.14.2; python_version>"3.4"
 # connexion requires werkzeug but connexion < 2.4.0 does not install werkzeug
 # we must peg werkzeug versions below to fix connexion
 # https://github.com/zalando/connexion/pull/1044