diff --git a/Dockerfile b/Dockerfile
index 391957c..bdedded 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -37,7 +37,7 @@ RUN \
     pip3 --version && \
     pip3 install --upgrade autoenv autopep8 cmake-format conan conan_package_tools meson && \
     pip3 install --upgrade cppclean flawfinder lizard pygments pybind11 GitPython pexpect subunit Jinja2 pylint clang-format CLinters && \
-    pip3 install --upgrade cltk dlib ipython jupyter matplotlib nose numba numpy pandas pymc3 requests scikit-learn scipy seaborn sympy quandl textblob nltk yfinance && \
+    pip3 install --upgrade --ignore-installed cltk dlib ipython jupyter matplotlib nose numba numpy pandas pymc3 requests scikit-learn scipy seaborn sympy quandl textblob nltk yfinance && \
     pip3 install --upgrade PyPortfolioOpt && \
     exit 0