diff --git a/requirements.txt b/requirements.txt
index cab4cb9..55e3b8d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,4 +4,4 @@ mnemonic==0.18
 pysha3==1.0.2
 python-axolotl-curve25519==0.4.1.post2
 requests==2.21.0
-ujson==1.35
+ujson==5.4.0
diff --git a/setup.py b/setup.py
index abc5852..3c52817 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@
     'pysha3==1.0.2',
     'python-axolotl-curve25519==0.4.1.post2',
     'requests==2.21.0',
-    'ujson==1.35',
+    'ujson==5.4.0',
 ]
 
 keywords = 'waves wavespy api client async'