diff --git a/tox.ini b/tox.ini
index a3da155e0d..1674dd9e46 100644
--- a/tox.ini
+++ b/tox.ini
@@ -54,9 +54,10 @@ commands =
 [testenv:package]
 skip_install = True
 deps =
-    check_manifest
-    build
-    twine
+    check_manifest==0.48
+    build==0.9.0
+    twine==4.0.1
+    pkginfo==1.8.3  # Work around https://github.com/pypa/twine/issues/940
 commands =
     check-manifest -v {posargs}
     python -m build {posargs}