diff --git a/modules/openapi-generator/src/main/resources/python-fastapi/requirements.mustache b/modules/openapi-generator/src/main/resources/python-fastapi/requirements.mustache
index edae73d188a0..0f5fe486cadb 100644
--- a/modules/openapi-generator/src/main/resources/python-fastapi/requirements.mustache
+++ b/modules/openapi-generator/src/main/resources/python-fastapi/requirements.mustache
@@ -14,7 +14,7 @@ graphql-relay==2.0.1
 h11==0.16.0
 httptools>=0.3.0,<0.7.0
 httpx==0.28.1
-idna==3.7
+idna==3.15
 itsdangerous==1.1.0
 Jinja2==3.1.4
 MarkupSafe==2.0.1
diff --git a/samples/server/petstore/python-fastapi/requirements.txt b/samples/server/petstore/python-fastapi/requirements.txt
index edae73d188a0..0f5fe486cadb 100644
--- a/samples/server/petstore/python-fastapi/requirements.txt
+++ b/samples/server/petstore/python-fastapi/requirements.txt
@@ -14,7 +14,7 @@ graphql-relay==2.0.1
 h11==0.16.0
 httptools>=0.3.0,<0.7.0
 httpx==0.28.1
-idna==3.7
+idna==3.15
 itsdangerous==1.1.0
 Jinja2==3.1.4
 MarkupSafe==2.0.1