diff --git a/requirements.txt b/requirements.txt
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--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,3 @@
+numpy==1.19.3  # bug in numpy 1.19.4, 1.19.3 used as workaround
+pyserial~=3.5
+future~=0.18.2
\ No newline at end of file