diff --git a/requirements.txt b/requirements.txt
index 2c939d49b..0af937e94 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,11 +1,11 @@
 cython>=0.24,<0.28.0
-numpy>=1.7
+numpy>=1.21.0rc1
 cymem>=1.30,<1.32
 preshed>=1.0.0,<2.0.0
 thinc>=6.10.3,<6.11.0
 murmurhash>=0.28,<0.29
 plac<1.0.0,>=0.9.6
-ujson>=1.35
+ujson>=5.4.0
 dill>=0.2,<0.3
 regex==2017.4.5
 requests>=2.13.0,<3.0.0