diff --git a/requirements.txt b/requirements.txt
index c16f567e..896e89fb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,8 @@
 cbor2~=5.1
-coincurve>=15.0.1,<19.0.0
+coincurve>=15.0.1,<20.0.0
 crcmod~=1.7
 ecdsa~=0.15
-ed25519-blake2b~=1.4
+ed25519-blake2b>=1.4.1,<2.0.0
 pycryptodome~=3.6
 pynacl~=1.4
 py-sr25519-bindings>=0.1.3,<2.0.0