diff --git a/tox.ini b/tox.ini
index 6c39299bb..d3ff930c3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -146,6 +146,8 @@ commands =
 
 [testenv:pypy3-pinned]
 basepython = {[testenv:pypy3]basepython}
+before_install:
+  - sudo apt-get -y remove libssl-dev
 deps =
     {[pinned]deps}
     lxml==4.0.0