diff --git a/requirements-dev.txt b/requirements-dev.txt
index 8ecaf431e..bafbb8867 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,5 +1,5 @@
 black[jupyter]>=23.3.0
-konoha<6.0.0
+konoha[janome]<6.0.0
 mypy>=1.2.0
 pytest>=7.3.1
 pytest-black-ng>=0.4.1
diff --git a/requirements.txt b/requirements.txt
index 87c8face9..1186efb44 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,6 @@ ftfy>=6.1.0
 gdown>=4.4.0
 gensim>=4.2.0
 huggingface-hub>=0.10.0
-janome>=0.4.2
 langdetect>=1.0.9
 lxml>=4.8.0
 matplotlib>=2.2.3