diff --git a/.circleci/config.yml b/.circleci/config.yml
index b03548e69..5a4c24c3e 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -23,6 +23,7 @@ init_pypirc: &init_pypirc
       echo -e "repository = $FE_PYPI_URL" >> ~/.pypirc
       echo -e "username = $FE_PYPI_USER" >> ~/.pypirc
       echo -e "password = $FE_PYPI_API_KEY" >> ~/.pypirc
+
 jobs:
   test_feature_engine_py39:
     docker:
@@ -36,6 +37,7 @@ jobs:
           name: Run tests with Python 3.9
           command: |
             tox -e py39
+
   test_feature_engine_py310:
     docker:
       - image: cimg/python:3.10.0
@@ -48,7 +50,8 @@ jobs:
           name: Run tests with Python 3.10
           command: |
             tox -e py310
-  test_feature_engine_py311:
+
+  test_feature_engine_py311_sklearn150:
     docker:
       - image: cimg/python:3.11.7
     working_directory: ~/project
@@ -57,9 +60,23 @@ jobs:
           path: ~/project
       - *prepare_tox
       - run:
-          name: Run tests with Python 3.11
+          name: Run tests with Python 3.11 and scikit-learn 1.0.0
           command: |
-            tox -e py311
+            tox -e py311-sklearn150
+
+  test_feature_engine_py311_sklearn160:
+    docker:
+      - image: cimg/python:3.11.7
+    working_directory: ~/project
+    steps:
+      - checkout:
+          path: ~/project
+      - *prepare_tox
+      - run:
+          name: Run tests with Python 3.11 and scikit-learn 1.4.0
+          command: |
+            tox -e py311-sklearn160
+
   test_feature_engine_py312:
     docker:
       - image: cimg/python:3.12.1
@@ -72,6 +89,7 @@ jobs:
           name: Run tests with Python 3.12
           command: |
             tox -e py312
+
   test_style:
     docker:
       - image: cimg/python:3.10.0
@@ -84,6 +102,7 @@ jobs:
           name: Run stylechecks
           command: |
             tox -e stylechecks
+
   test_docs:
     docker:
       - image: cimg/python:3.10.0
@@ -96,6 +115,7 @@ jobs:
           name: Run doc build
           command: |
             tox -e docs
+
   test_type:
     docker:
       - image: cimg/python:3.10.0
@@ -108,6 +128,7 @@ jobs:
           name: Run typechecks
           command: |
             tox -e typechecks
+
   upload_codecov:
     docker:
       - image: cimg/python:3.10.0
@@ -141,13 +162,15 @@ jobs:
             python setup.py sdist bdist_wheel --universal
             ls -l dist
             twine upload dist/*
+
 workflows:
   version: 2
   test-all:
     jobs:
       - test_feature_engine_py39
       - test_feature_engine_py310
-      - test_feature_engine_py311
+      - test_feature_engine_py311_sklearn150
+      - test_feature_engine_py311_sklearn160
       - test_feature_engine_py312
       - test_style
       - test_docs
@@ -161,7 +184,8 @@ workflows:
           requires:
             - test_feature_engine_py39
             - test_feature_engine_py310
-            - test_feature_engine_py311
+            - test_feature_engine_py311_sklearn150
+            - test_feature_engine_py311_sklearn160
             - test_feature_engine_py312
             - test_style
             - test_docs
diff --git a/tox.ini b/tox.ini
index 5ceeb7d6a..54c16f184 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,15 +1,13 @@
 [tox]
-envlist = py39, py310, py311, py312, codecov, docs, stylechecks, typechecks
+envlist = py39, py310, py311-sklearn150, py311-sklearn160, py312, codecov, docs, stylechecks, typechecks
 skipsdist = true
 
 [testenv]
 install_command = pip install {opts} {packages}
 envdir = {toxworkdir}/unit_tests
-
 setenv =
-  PYTHONPATH=.
-  COVERAGE_RCFILE = {envtmpdir}/coveragerc
-
+    PYTHONPATH=.
+    COVERAGE_RCFILE = {envtmpdir}/coveragerc
 commands =
     pytest tests
 
@@ -21,9 +19,15 @@ deps =
 deps =
     -rtest_requirements.txt
 
-[testenv:py311]
+[testenv:py311-sklearn150]
 deps =
     -rtest_requirements.txt
+    scikit-learn==1.5.1
+
+[testenv:py311-sklearn160]
+deps =
+    -rtest_requirements.txt
+    scikit-learn==1.6.1
 
 [testenv:py312]
 deps =
@@ -31,7 +35,7 @@ deps =
 
 [testenv:codecov]
 deps =
-	-rtest_requirements.txt
+    -rtest_requirements.txt
 commands_pre =
     {envpython} -c 'from pathlib import Path; Path(r"{env:COVERAGE_RCFILE}").write_text(Path(".coveragerc").read_text())'
 commands =
@@ -39,32 +43,26 @@ commands =
     coverage report
 
 [testenv:docs]
-deps = 
-	-r docs/requirements.txt
-commands = 
-	sphinx-build -W -b html -d {envtmpdir}/doctrees docs {envtmpdir}/html
-
+deps =
+     -r docs/requirements.txt
+commands =
+     sphinx-build -W -b html -d {envtmpdir}/doctrees docs {envtmpdir}/html
 
 [testenv:stylechecks]
 deps =
     flake8
-
 commands = {posargs:flake8 feature_engine tests}
 
-
 [testenv:typechecks]
 deps =
      mypy
-
 commands = {posargs:mypy feature_engine}
 
-
 [flake8]
 exclude = .git, env
 # match black code formatter
 max-line-length = 88
 
-
 profile = black
 line_length = 88
 lines_between_sections = 1