diff --git a/requirements.txt b/requirements.txt
index 91829112429a6ad57982cc59bb4553216d7ff504..81583a9be9c44590a1a92e9f3bca7ad435a20269 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,8 @@
-aiohttp >= 3.3.2
-pylibscrypt >= 1.7.1
-libnacl >= 1.6.1
-base58 >= 1.0.0
-jsonschema >= 2.6.0
-pypeg2 >= 2.15.2
-attr >= 0.3.1
-pyaes >= 1.6.1
\ No newline at end of file
+aiohttp>=3.3.2
+pylibscrypt>=1.7.1
+libnacl>=1.6.1
+base58>=1.0.0
+jsonschema>=2.6.0
+pypeg2>=2.15.2
+attrs==19.3.0
+pyaes>=1.6.1