diff --git a/api/requirements.txt b/api/requirements.txt
index 038c74f232abf75436c47e00c4df2a2a59651285..162b50040286bb9a0177801c580a31013082a360 100644
--- a/api/requirements.txt
+++ b/api/requirements.txt
@@ -1,4 +1,4 @@
-sphinx >= 3.0.2, <= 3.0.4
+sphinx >= 2.2.1, <= 2.4.4
 recommonmark
 sphinx-markdown-tables
 sphinx_rtd_theme
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 038c74f232abf75436c47e00c4df2a2a59651285..162b50040286bb9a0177801c580a31013082a360 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,4 @@
-sphinx >= 3.0.2, <= 3.0.4
+sphinx >= 2.2.1, <= 2.4.4
 recommonmark
 sphinx-markdown-tables
 sphinx_rtd_theme
diff --git a/tutorials/requirements.txt b/tutorials/requirements.txt
index c83aa05f72dc62b652a4657819cb10e4e1ae2027..13396200381cc893c7a1ee023cbc0341eeea9f87 100644
--- a/tutorials/requirements.txt
+++ b/tutorials/requirements.txt
@@ -1,4 +1,4 @@
-sphinx >= 3.0.2, <= 3.0.4
+sphinx >= 2.2.1, <= 2.4.4
 recommonmark
 sphinx-markdown-tables
 sphinx_rtd_theme