diff --git a/requirements-testing.txt b/requirements-testing.txt
index 2a4bef845b..3cac3c91ba 100644
--- a/requirements-testing.txt
+++ b/requirements-testing.txt
@@ -7,7 +7,6 @@ jsonschema
 executing
 asttokens
 responses
-socksio
 httpcore[http2]
 setuptools
 docker
diff --git a/scripts/populate_tox/tox.jinja b/scripts/populate_tox/tox.jinja
index c0facb721d..b91f9d0b45 100644
--- a/scripts/populate_tox/tox.jinja
+++ b/scripts/populate_tox/tox.jinja
@@ -83,6 +83,7 @@ deps =
     common: pysocks
     common: pytest-asyncio
     common: httpcore[asyncio]
+    common: socksio
     # See https://github.com/pytest-dev/pytest/issues/9621
     # and https://github.com/pytest-dev/pytest-forked/issues/67
     # for justification of the upper bound on pytest
@@ -103,6 +104,7 @@ deps =
     gevent: pysocks
     gevent: pytest-asyncio
     gevent: setuptools<82
+    gevent: socksio
     {py3.10,py3.11}-gevent: zope.event<5.0.0
     {py3.10,py3.11}-gevent: zope.interface<8.0
 
diff --git a/tox.ini b/tox.ini
index 18dc591e75..5b21972349 100644
--- a/tox.ini
+++ b/tox.ini
@@ -406,6 +406,7 @@ deps =
     common: pysocks
     common: pytest-asyncio
     common: httpcore[asyncio]
+    common: socksio
     # See https://github.com/pytest-dev/pytest/issues/9621
     # and https://github.com/pytest-dev/pytest-forked/issues/67
     # for justification of the upper bound on pytest
@@ -426,6 +427,7 @@ deps =
     gevent: pysocks
     gevent: pytest-asyncio
     gevent: setuptools<82
+    gevent: socksio
     {py3.10,py3.11}-gevent: zope.event<5.0.0
     {py3.10,py3.11}-gevent: zope.interface<8.0