diff --git a/ippisite/requirements-core.txt b/ippisite/requirements-core.txt
index 1adab58f8a81b98c836e5cba93808964ffb1c0cf..e340d8979a2cf5ff3b7d47b29f30b1e0b2a232bb 100644
--- a/ippisite/requirements-core.txt
+++ b/ippisite/requirements-core.txt
@@ -14,7 +14,7 @@ bioblend
 bs4
 # libraries to compute PCA
 sklearn
-scipy
+scipy==1.2.1 #Scipy >=1.3 does not support Python<3.5
 matplotlib==2.2.3 #Matplotlib 3.0+ does not support Python 2.x, 3.0, 3.1, 3.2, 3.3, or 3.4.
 # postgres driver
 psycopg2-binary