diff --git a/pqkmeans/evaluation.py b/pqkmeans/evaluation.py
index e91d7a7..c3b84f6 100644
--- a/pqkmeans/evaluation.py
+++ b/pqkmeans/evaluation.py
@@ -3,7 +3,10 @@
 import os
 import six.moves.urllib
 import tarfile
-import texmex_python
+try:
+    import texmex_python
+except ImportError:
+    pass
 
 
 def get_gmm_random_dataset(k, dimension=100, test_size=5000, train_size=500):
diff --git a/requirements.txt b/requirements.txt
index 29656d8..53751e4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,5 @@
-numpy
+numpy<1.21
 scikit-learn
-pipe
+pipe<2.0
 scipy
 six
-texmex_python==1.0.0