diff --git a/requirements/common.in b/requirements/common.in
index 094d5a0d73..bbe1652e6c 100644
--- a/requirements/common.in
+++ b/requirements/common.in
@@ -176,7 +176,7 @@ pyoembed==0.1.2
 -e "git+https://github.com/zulip/python-zulip-api.git@0.5.2#egg=zulip_bots==0.5.2+git&subdirectory=zulip_bots"
 
 # Used for Hesiod lookups, etc.
-py3dns==3.1.0
+py3dns==3.2.0
 
 # Install Python Social Auth
 social-auth-app-django==2.1.0
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 3994593e40..27310258e4 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -115,7 +115,7 @@ premailer==3.2.0
 prompt-toolkit==1.0.15    # via ipython
 psycopg2==2.7.5
 ptyprocess==0.5.2         # via pexpect
-py3dns==3.1.0
+py3dns==3.2.0
 pyaml==17.10.0            # via moto
 pyasn1-modules==0.2.1
 pyasn1==0.4.3
diff --git a/requirements/prod.txt b/requirements/prod.txt
index 36f9c11009..92535860a9 100644
--- a/requirements/prod.txt
+++ b/requirements/prod.txt
@@ -84,7 +84,7 @@ premailer==3.2.0
 prompt-toolkit==1.0.15    # via ipython
 psycopg2==2.7.5
 ptyprocess==0.5.2         # via pexpect
-py3dns==3.1.0
+py3dns==3.2.0
 pyasn1-modules==0.2.1
 pyasn1==0.4.3
 pycparser==2.18           # via cffi