diff --git a/tox.ini b/tox.ini
index 3c39d017..8487e181 100644
--- a/tox.ini
+++ b/tox.ini
@@ -47,6 +47,7 @@ basepython=python3.9
 deps =
     {[pinned]deps}
     scrapy==2.7.0
+    Twisted<23.8.0
 
 # After ``scrapy.http.request.NO_CALLBACK`` was introduced.
 # See: https://github.com/scrapinghub/scrapy-poet/issues/118
@@ -55,6 +56,7 @@ basepython=python3.9
 deps =
     {[pinned]deps}
     scrapy==2.8.0
+    Twisted<23.8.0
 
 [testenv:asyncio]
 setenv =