diff --git a/tox.ini b/tox.ini
index 049206426..31118f5af 100644
--- a/tox.ini
+++ b/tox.ini
@@ -72,14 +72,14 @@ commands =
 
 
 [testenv:cpython-apidocs]
-description = Build CPython API documentation
+description = Build CPython 3.11 API documentation
 deps = 
     pytest
 commands =
     sh -c "if [ ! -d {toxworkdir}/cpython ]; then \
-        git clone --depth 1 https://github.com/python/cpython.git {toxworkdir}/cpython; \
+        git clone https://github.com/python/cpython.git {toxworkdir}/cpython; \
         fi"
-    sh -c "cd {toxworkdir}/cpython && git pull"
+    sh -c "cd {toxworkdir}/cpython && git checkout 3.11"
     touch {toxworkdir}/cpython/Lib/__init__.py
     rm -rf {toxworkdir}/cpython-output
     - pydoctor \
@@ -160,13 +160,13 @@ commands =
         assert code in [0,2], 'pydoctor exited with code %s, expected code 0 or 2.'%code"
 
 [testenv:cpython-summary]
-description = Parse CPython code and write a summary only
+description = Parse CPython 3.11 code and write a summary only
 
 commands =
     sh -c "if [ ! -d {toxworkdir}/cpython ]; then \
-        git clone --depth 1 https://github.com/python/cpython.git {toxworkdir}/cpython; \
+        git clone https://github.com/python/cpython.git {toxworkdir}/cpython; \
         fi"
-    sh -c "cd {toxworkdir}/cpython && git pull"
+    sh -c "cd {toxworkdir}/cpython && git checkout 3.11"
     touch {toxworkdir}/cpython/Lib/__init__.py
     rm -rf {toxworkdir}/cpython-summary-output
     # TODO: Switch to restructuredtext when #261 is fixed.