diff --git a/sar-training-stack.txt b/sar-training-stack.txt
index 4aaed83c59aefac5d5316be6ac571ce887892af1..5736534fa71d521b94687942875ad18a7e32084f 100644
--- a/sar-training-stack.txt
+++ b/sar-training-stack.txt
@@ -1,4 +1,4 @@
-numpy
-scipy
-matplotlib
+numpy=1.19.1
+scipy=1.5.2
+matplotlib=3.3.1
 geopandas