diff --git a/requirements/requirements_all.txt b/requirements/requirements_all.txt
index c8934dd00..a288699c0 100644
--- a/requirements/requirements_all.txt
+++ b/requirements/requirements_all.txt
@@ -15,7 +15,7 @@ pytest>=5.3.5
 pytest-cov>=2.6.1
 pytest-lazy-fixture>=0.6.3
 pytest-xdist>=1.28.0
-sphinx>=2.1.2
+sphinx>=2.1.2,<3.0
 flake8>=3.7.7
 mypy>=0.670
 sphinx-autodoc-typehints>=1.6.0,<1.10
@@ -29,4 +29,4 @@ ipython>=7.2.0
 codecov>=2.0.15
 pre-commit>=1.20.0
 shap>=0.35.0
-scipy>=1.3.1
\ No newline at end of file
+scipy>=1.3.1
diff --git a/requirements/requirements_ci.txt b/requirements/requirements_ci.txt
index 767d7c8b4..5fb2a6b68 100644
--- a/requirements/requirements_ci.txt
+++ b/requirements/requirements_ci.txt
@@ -1,6 +1,6 @@
 pytest>=5.3.5
 pytest-cov>=2.6.1
-sphinx>=2.1.2
+sphinx>=2.1.2,<3.0
 pytest-xdist>=1.28.0
 pytest-lazy-fixture>=0.6.3
 flake8>=3.7.7