diff --git a/sdtm_mapper/requirements.txt b/sdtm_mapper/requirements.txt
index 6697cdb..3feff81 100644
--- a/sdtm_mapper/requirements.txt
+++ b/sdtm_mapper/requirements.txt
@@ -5,7 +5,7 @@ botocore
 setuptools==39.1.0
 numpy
 Keras
-scikit_learn
+scikit-learn
 pathlib
 ################################################################
 # TensorFlow can be installed either as CPU or GPU versions.
@@ -13,4 +13,4 @@ pathlib
 
 #tensorflow		# CPU Version of TensorFlow.
 # tensorflow-gpu	# GPU version of TensorFlow.
-#tensorflow_hub
\ No newline at end of file
+#tensorflow_hub
diff --git a/sdtm_mapper/requirements.txt.bak b/sdtm_mapper/requirements.txt.bak
index bbdc1c1..bdff0b8 100644
--- a/sdtm_mapper/requirements.txt.bak
+++ b/sdtm_mapper/requirements.txt.bak
@@ -5,7 +5,7 @@ botocore
 setuptools==39.1.0
 numpy
 Keras
-scikit_learn
+scikit-learn
 pathlib
 ################################################################
 # TensorFlow can be installed either as CPU or GPU versions.
@@ -13,4 +13,4 @@ pathlib
 
 #tensorflow		# CPU Version of TensorFlow.
 # tensorflow-gpu	# GPU version of TensorFlow.
-tensorflow_hub
\ No newline at end of file
+tensorflow_hub
diff --git a/sdtm_mapper/setup.py b/sdtm_mapper/setup.py
index d502a07..a1bbb51 100644
--- a/sdtm_mapper/setup.py
+++ b/sdtm_mapper/setup.py
@@ -14,7 +14,7 @@
     long_description_content_type="text/markdown",
     license='LICENSE',
     include_package_data=True,
-    install_requires=['numpy','pandas','pathlib','sas7bdat','boto3','botocore','sklearn','keras'],
+    install_requires=['numpy','pandas','pathlib','sas7bdat','boto3','botocore','scikit-learn','keras'],
     url='https://github.com/stomioka/sdtm_mapper',
     packages=setuptools.find_packages(exclude=('tests','doc','docs','images','poc','SDTMMapper','train_data','tutorials')),
     classifiers=[
@@ -23,4 +23,4 @@
         "Natural Language :: English",
         "Topic :: Scientific/Engineering :: Artificial Intelligence"
     ],
-)
\ No newline at end of file
+)
diff --git a/sdtm_mapper/setup.py.bak b/sdtm_mapper/setup.py.bak
index e33e7f7..7be64f3 100644
--- a/sdtm_mapper/setup.py.bak
+++ b/sdtm_mapper/setup.py.bak
@@ -14,7 +14,7 @@ setuptools.setup(
     long_description_content_type="text/markdown",
     license='LICENSE',
     include_package_data=True,
-    install_requires=['numpy','pandas','pathlib','sas7bdat','boto3','botocore','sklearn','keras'],
+    install_requires=['numpy','pandas','pathlib','sas7bdat','boto3','botocore','scikit-learn','keras'],
     url='https://github.com/stomioka/sdtm_mapper',
     packages=setuptools.find_packages(exclude=('tests','doc','docs','images','poc','SDTMMapper','train_data','tutorials')),
     classifiers=[
@@ -23,4 +23,4 @@ setuptools.setup(
         "Natural Language :: English",
         "Topic :: Scientific/Engineering :: Artificial Intelligence"
     ],
-)
\ No newline at end of file
+)