diff --git a/requirements/pypy3.txt b/requirements/pypy3.txt
index 38271d4d..ba7e18b2 100644
--- a/requirements/pypy3.txt
+++ b/requirements/pypy3.txt
@@ -1,2 +1,2 @@
 dnspython3==1.12.0
-py3dns==3.1.0
+py3dns==4.0.0
diff --git a/requirements/python3.txt b/requirements/python3.txt
index 38271d4d..ba7e18b2 100644
--- a/requirements/python3.txt
+++ b/requirements/python3.txt
@@ -1,2 +1,2 @@
 dnspython3==1.12.0
-py3dns==3.1.0
+py3dns==4.0.0
diff --git a/requirements/rtd.txt b/requirements/rtd.txt
index cf39d6da..d0ce83d5 100644
--- a/requirements/rtd.txt
+++ b/requirements/rtd.txt
@@ -13,7 +13,7 @@ mysqlclient==1.4.6
 pyspf==2.0.14 # rq.filter: ==2.0.12t
 spoon==1.0.6
 dnspython3==1.12.0
-py3dns==3.1.0
+py3dns==4.0.0
 mock==2.0.0
 pytest==2.9.1
 pytest-cov==2.2.1