diff --git a/backend/docs/requirements.txt b/backend/docs/requirements.txt
index 256553801..d51ce4405 100644
--- a/backend/docs/requirements.txt
+++ b/backend/docs/requirements.txt
@@ -6,7 +6,6 @@ redis
 mock
 requests
 python-daemon
-bunch
 lockfile
 
 
diff --git a/backend/requirements.txt b/backend/requirements.txt
index 83c2886f3..a6e6d7e49 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -4,7 +4,6 @@ PyYAML
 redis
 retask
 python-daemon
-bunch
 # documentation
 sphinx
 sphinx-argparse
diff --git a/keygen/requirements.txt b/keygen/requirements.txt
index edd49ddb4..dc4150b8f 100644
--- a/keygen/requirements.txt
+++ b/keygen/requirements.txt
@@ -5,3 +5,7 @@ mock
 pytest
 pytest-cov
 
+# It seems that sphinx incorrectly specifies its jinja2 dependency.
+# There is some backward incompatible change in 3.1.x and sphinx fails
+# because of that. Let's temporarily stay with an older version.
+jinja2==3.0.0