diff --git a/pdns-admin-base-ngoduykhanh/Dockerfile b/pdns-admin-base-ngoduykhanh/Dockerfile
index 995669a..3acfefb 100644
--- a/pdns-admin-base-ngoduykhanh/Dockerfile
+++ b/pdns-admin-base-ngoduykhanh/Dockerfile
@@ -1,10 +1,10 @@
-FROM fedora:30
+FROM fedora:31
 
-RUN curl -sSL -o /etc/yum.repos.d/yarn.repo https://dl.yarnpkg.com/rpm/yarn.repo
-
-RUN dnf -y --setopt=install_weak_deps=False install \
+RUN curl -sSL -o /etc/yum.repos.d/yarn.repo https://dl.yarnpkg.com/rpm/yarn.repo \
+  && dnf -y --setopt=install_weak_deps=False install \
     python3-ldap \
     python3-mysql \
+    python3-pip \
     python3-xmlsec \
     uwsgi \
     yarn \
@@ -15,15 +15,15 @@ RUN mkdir -p /opt/powerdns-admin \
     | tar -xzC /opt/powerdns-admin --strip 1 \
   && sed -i '/python-ldap/d' /opt/powerdns-admin/requirements.txt \
   && sed -i '/mysqlclient/d' /opt/powerdns-admin/requirements.txt \
-  && chown -R root: /opt/powerdns-admin \
-  && chown -R uwsgi: /opt/powerdns-admin/upload
+  && chown -R root: /opt/powerdns-admin
 
 WORKDIR /opt/powerdns-admin
 
 RUN pip3 install --no-cache-dir envtpl python-dotenv \
   && pip3 install -r requirements.txt --no-cache-dir
 
-ENV PDNS_ADMIN_LOG_LEVEL="'INFO'" \
+ENV FLASK_APP=/opt/powerdns-admin/powerdnsadmin/__init__.py \
+  PDNS_ADMIN_LOG_LEVEL="'INFO'" \
   PDNS_ADMIN_SAML_ENABLED=False
 
 COPY config.py.tpl /
@@ -31,6 +31,7 @@ COPY config.py.tpl /
 RUN envtpl < /config.py.tpl > /opt/powerdns-admin/config.py \
   && sed -i '/SQLALCHEMY_DATABASE_URI/d' /opt/powerdns-admin/config.py
 
-RUN yarn install --pure-lockfile \
+RUN yarn install --pure-lockfile --production \
+  && yarn cache clean \
   && flask assets build \
-  && chown -R uwsgi: /opt/powerdns-admin/app/static/.webassets-cache
+  && chown -R uwsgi: /opt/powerdns-admin/powerdnsadmin/static/.webassets-cache
diff --git a/pdns-recursor/Dockerfile b/pdns-recursor/Dockerfile
index aafddd8..15190d8 100644
--- a/pdns-recursor/Dockerfile
+++ b/pdns-recursor/Dockerfile
@@ -1,7 +1,8 @@
-FROM fedora:30
+FROM fedora:31
 
 RUN dnf -y --setopt=install_weak_deps=False install \
     pdns-recursor \
+    python3-pip \
   && dnf clean all
 
 RUN pip3 install --no-cache-dir envtpl
@@ -9,7 +10,7 @@ RUN pip3 install --no-cache-dir envtpl
 RUN mkdir -p /etc/pdns-recursor/api.d \
   && chown -R pdns-recursor: /etc/pdns-recursor/api.d
 
-ENV VERSION=4.1 \
+ENV VERSION=4.2 \
   PDNS_setuid=pdns-recursor \
   PDNS_setgid=pdns-recursor \
   PDNS_daemon=no
diff --git a/pdns/Dockerfile b/pdns/Dockerfile
index 2146213..da57d1a 100644
--- a/pdns/Dockerfile
+++ b/pdns/Dockerfile
@@ -1,16 +1,17 @@
-FROM fedora:30
+FROM fedora:31
 
 RUN sed -i '/tsflags=nodocs/d' /etc/dnf/dnf.conf \
   && dnf -y --setopt=install_weak_deps=False install \
+    hostname \
+    mariadb \
     pdns \
     pdns-backend-mysql \
-    mariadb \
-    hostname \
+    python3-pip \
   && dnf clean all
 
 RUN pip3 install --no-cache-dir envtpl
 
-ENV VERSION=4.1 \
+ENV VERSION=4.2 \
   PDNS_guardian=yes \
   PDNS_setuid=pdns \
   PDNS_setgid=pdns \