diff --git a/requirements_dev.txt b/requirements_dev.txt
index d56ea32..d54c35f 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,9 +4,14 @@ bump2version==0.5.11
 wheel==0.33.6
 watchdog==0.9.0
 flake8==3.7.8
-tox==4.8.0
 coverage==4.5.4
 Sphinx==1.8.5
+
+# Version-specific dependencies
+tox==3.24.0; python_version < '3.8'
+tox==4.8.0; python_version >= '3.8'
+importlib_metadata<5.0.0; python_version < '3.8'
+importlib_metadata==7.2.1; python_version >= '3.8'
 twine==4.0.2
 
 pytest==7.4.3