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-rw-r--r--docs/requirements-docs.txt1
1 files changed, 1 insertions, 0 deletions
diff --git a/docs/requirements-docs.txt b/docs/requirements-docs.txt
index ed96b42b..b95c29fb 100644
--- a/docs/requirements-docs.txt
+++ b/docs/requirements-docs.txt
@@ -1,3 +1,4 @@
+six
sphinx>=4.2.0 # BSD
sphinx-rtd-theme>=1.0.0 # MIT
sphinxcontrib-blockdiag # BSD