diff --git a/requirements.txt b/requirements.txt
index a19b03d2179bfcdb73d04f9b71b0317de29575ee..4eac22f03165ba934cf9a9517a14ed4cd8a4c7c6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,11 +1,11 @@
 bitstring
 docrep
 future
-numpy
-onnx
-onnxruntime
+numpy==1.18.0
+onnx==1.5.0
+onnxruntime==1.2.0
 pre-commit
+pyverilator
 scipy
 sphinx
 wget
-pyverilator