diff --git a/setup.cfg b/setup.cfg
index f447e53a8..f96340750 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -56,6 +56,7 @@ install_requires =
     PyYAML==5.3.1
     Red-Lavalink==0.7.1
     schema==0.7.2
+    six==1.15.0
     tqdm==4.48.0
     typing-extensions==3.7.4.2
     uvloop==0.14.0; sys_platform != "win32" and platform_python_implementation == "CPython"
@@ -73,7 +74,6 @@ docs =
     Pygments==2.6.1
     pyparsing==2.4.7
     requests==2.24.0
-    six==1.15.0
     snowballstemmer==2.0.0
     Sphinx==3.1.2
     sphinx-rtd-theme==0.5.0
@@ -109,7 +109,6 @@ test =
     pytest==6.0.1
     pytest-asyncio==0.14.0
     pytest-mock==3.2.0
-    six==1.15.0
     toml==0.10.1
     wrapt==1.12.1
 all =
diff --git a/tools/primary_deps.ini b/tools/primary_deps.ini
index faf415e6a..1b0bf5bc3 100644
--- a/tools/primary_deps.ini
+++ b/tools/primary_deps.ini
@@ -18,6 +18,7 @@ install_requires =
     distro; sys_platform == "linux"
     fuzzywuzzy
     markdown
+    python-dateutil
     python-Levenshtein-wheels
     PyYAML
     Red-Lavalink