diff --git a/tests/travis/run_test.sh b/tests/travis/run_test.sh
index 4a01455d84b9..bcc2b4d305c0 100755
--- a/tests/travis/run_test.sh
+++ b/tests/travis/run_test.sh
@@ -27,11 +27,12 @@ if [ ${TASK} == "python_test" ]; then
 
     echo "-------------------------------"
     conda activate python3
+    conda --version
     python --version
-    conda install numpy scipy pandas matplotlib scikit-learn dask
 
     python -m pip install graphviz pytest pytest-cov codecov
     python -m pip install datatable
+    python -m pip install numpy scipy pandas matplotlib scikit-learn dask[complete]
     python -m pytest -v --fulltrace -s tests/python --cov=python-package/xgboost || exit -1
     codecov
 fi