diff --git a/docker/testenv/Dockerfile-backend b/docker/testenv/Dockerfile-backend
index b84fef87d..03906855e 100644
--- a/docker/testenv/Dockerfile-backend
+++ b/docker/testenv/Dockerfile-backend
@@ -1,4 +1,4 @@
-FROM azul/zulu-openjdk-debian:14
+FROM adoptopenjdk/openjdk15:debianslim-jre
 LABEL maintainer="Andrey Antukh <niwi@niwi.nz>"
 ADD ./bundle/backend/ /opt/bundle/
 WORKDIR /opt/bundle
diff --git a/docker/testenv/Dockerfile-exporter b/docker/testenv/Dockerfile-exporter
index 40bce1cdd..173e3b350 100644
--- a/docker/testenv/Dockerfile-exporter
+++ b/docker/testenv/Dockerfile-exporter
@@ -1,24 +1,33 @@
-FROM debian:buster
+FROM debian:buster-slim
 LABEL maintainer="Andrey Antukh <niwi@niwi.nz>"
 
 ARG DEBIAN_FRONTEND=noninteractive
 
-ENV LANG=en_US.UTF-8 LC_ALL=C.UTF-8
+ENV LANG=en_US.UTF-8 LC_ALL=en_US.UTF-8
 
 RUN set -ex; \
     mkdir -p /etc/resolvconf/resolv.conf.d; \
-    echo "nameserver 8.8.8.8" > /etc/resolvconf/resolv.conf.d/tail;
-
-RUN set -ex; \
-    apt-get update && \
-    apt-get install -yq \
+    echo "nameserver 8.8.8.8" > /etc/resolvconf/resolv.conf.d/tail; \
+    apt-get -qq update; \
+    apt-get -qqy install --no-install-recommends \
         locales \
         gnupg2 \
         ca-certificates \
         wget \
+        sudo \
+        vim \
         curl \
         bash \
+        xz-utils \
         rlwrap \
+    ; \
+    echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen; \
+    locale-gen; \
+    rm -rf /var/lib/apt/lists/*;
+
+RUN set -ex; \
+    apt-get -qq update; \
+    apt-get -qqy install \
         imagemagick \
         netpbm \
         potrace \
@@ -69,11 +78,11 @@ RUN set -ex; \
 RUN set -ex; \
     mkdir -p /tmp/node; \
     cd /tmp/node; \
-    export PATH="$PATH:/usr/local/node-v12.18.3/bin"; \
-    wget https://nodejs.org/dist/v12.18.3/node-v12.18.3-linux-x64.tar.xz; \
-    tar xvf node-v12.18.3-linux-x64.tar.xz; \
-    mv /tmp/node/node-v12.18.3-linux-x64 /usr/local/node-v12.18.3; \
-    /usr/local/node-v12.18.3/bin/npm install -g yarn; \
+    export PATH="$PATH:/usr/local/node-v12.18.4/bin"; \
+    wget https://nodejs.org/dist/v12.18.4/node-v12.18.4-linux-x64.tar.xz; \
+    tar xvf node-v12.18.4-linux-x64.tar.xz; \
+    mv /tmp/node/node-v12.18.4-linux-x64 /usr/local/node-v12.18.4; \
+    /usr/local/node-v12.18.4/bin/npm install -g yarn; \
     rm -rf /tmp/node;
 
 WORKDIR /opt/app
@@ -81,7 +90,7 @@ WORKDIR /opt/app
 ADD ./bundle/exporter/ /opt/app/
 
 RUN set -ex; \
-    export PATH="$PATH:/usr/local/node-v12.18.3/bin"; \
+    export PATH="$PATH:/usr/local/node-v12.18.4/bin"; \
     yarn install;
 
-CMD ["/usr/local/node-v12.18.3/bin/node", "app.js"]
+CMD ["/usr/local/node-v12.18.4/bin/node", "app.js"]