diff --git a/docs/conf.py b/docs/conf.py
index 4414ef637..813417bae 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -295,8 +295,6 @@ intersphinx_mapping = {
 # ------------------------------------
 
 hoverxref_auto_ref = True
-hoverxref_project = "scrapy"
-hoverxref_version = release
 hoverxref_role_types = {
     "class": "tooltip",
     "confval": "tooltip",
diff --git a/tox.ini b/tox.ini
index b1babc7fd..cd118c921 100644
--- a/tox.ini
+++ b/tox.ini
@@ -74,11 +74,15 @@ deps =
 changedir = docs
 deps =
     -rdocs/requirements.txt
+setenv =
+    READTHEDOCS_PROJECT=scrapy
+    READTHEDOCS_VERSION=master
 
 [testenv:docs]
 basepython = python3
 changedir = {[docs]changedir}
 deps = {[docs]deps}
+setenv = {[docs]setenv}
 commands =
     sphinx-build -W -b html . {envtmpdir}/html
 
@@ -86,6 +90,7 @@ commands =
 basepython = python3
 changedir = {[docs]changedir}
 deps = {[docs]deps}
+setenv = {[docs]setenv}
 commands =
     sphinx-build -b coverage . {envtmpdir}/coverage
 
@@ -93,6 +98,7 @@ commands =
 basepython = python3
 changedir = {[docs]changedir}
 deps = {[docs]deps}
+setenv = {[docs]setenv}
 commands =
     sphinx-build -W -b linkcheck . {envtmpdir}/linkcheck