diff --git a/tox.ini b/tox.ini
index ad9f801cd..148a96dda 100644
--- a/tox.ini
+++ b/tox.ini
@@ -66,7 +66,7 @@ commands =
     py.test {posargs:scrapy tests}
 deps =
     {[py27]deps}
-    # Latest version that won’t fail due to the use of the typing module.
+    # Latest version that will not fail due to the use of the typing module.
     Twisted==16.4.1
 
 [testenv:py35]
@@ -78,7 +78,8 @@ deps =
 
     # Extras
     botocore>=1.3.23
-    Pillow>=3.4.2
+    # Pillow 10.0.0 and higher break compatibility with Scrapy 1.8.x.
+    Pillow<10.0.0
 
 [testenv:py35-pinned]
 basepython = python3.5