diff --git a/requirements.txt b/requirements.txt
index 121c535..1f37f26 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
-numpy
-six
-sorcery
-pytest
-cloudpickle
-wrapt
\ No newline at end of file
+numpy==1.16.4
+six==1.12.0
+sorcery==0.1.0
+pytest==4.6.3
+cloudpickle==1.2.1
+wrapt==1.11.1
\ No newline at end of file