diff --git a/docs/docker/Dockerfile.bionic b/docs/docker/Dockerfile.bionic
index 8fbc26269475f..1732910b6a4bd 100644
--- a/docs/docker/Dockerfile.bionic
+++ b/docs/docker/Dockerfile.bionic
@@ -15,42 +15,44 @@ RUN apt-get update && apt-get install -y curl && \
     apt-get install -y nodejs
 
 # 2. Install WebKit dependencies
-RUN apt-get update && apt-get install -y libwoff1 \
-                                         libopus0 \
-                                         libwebp6 \
-                                         libwebpdemux2 \
-                                         libenchant1c2a \
-                                         libgudev-1.0-0 \
-                                         libsecret-1-0 \
-                                         libhyphen0 \
-                                         libgdk-pixbuf2.0-0 \
-                                         libegl1 \
-                                         libnotify4 \
-                                         libxslt1.1 \
-                                         libevent-2.1-6 \
-                                         libgles2 \
-                                         libvpx5
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libwoff1 \
+    libopus0 \
+    libwebp6 \
+    libwebpdemux2 \
+    libenchant1c2a \
+    libgudev-1.0-0 \
+    libsecret-1-0 \
+    libhyphen0 \
+    libgdk-pixbuf2.0-0 \
+    libegl1 \
+    libnotify4 \
+    libxslt1.1 \
+    libevent-2.1-6 \
+    libgles2 \
+    libvpx5
 
 # 3. Install gstreamer and plugins to support video playback in WebKit.
-RUN apt-get update && apt-get install -y libgstreamer-gl1.0-0 \
-                                         libgstreamer-plugins-bad1.0-0 \
-                                         gstreamer1.0-plugins-good
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libgstreamer-gl1.0-0 \
+    libgstreamer-plugins-bad1.0-0 \
+    gstreamer1.0-plugins-good
 
 # 4. Install Chromium dependencies
-
-RUN apt-get update && apt-get install -y libnss3 \
-                                         libxss1 \
-                                         libasound2 \
-                                         fonts-noto-color-emoji
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libnss3 \
+    libxss1 \
+    libasound2 \
+    fonts-noto-color-emoji
 
 # 5. Install Firefox dependencies
-
-RUN apt-get update && apt-get install -y libdbus-glib-1-2 \
-                                         libxt6
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libdbus-glib-1-2 \
+    libxt6
 
 # 6. Install ffmpeg to bring in audio and video codecs necessary for playing videos in Firefox.
-
-RUN apt-get update && apt-get install -y ffmpeg
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ffmpeg
 
 # 7. Add user so we don't need --no-sandbox in Chromium
 RUN groupadd -r pwuser && useradd -r -g pwuser -G audio,video pwuser \
@@ -58,7 +60,8 @@ RUN groupadd -r pwuser && useradd -r -g pwuser -G audio,video pwuser \
     && chown -R pwuser:pwuser /home/pwuser
 
 # 8. (Optional) Install XVFB if there's a need to run browsers in headful mode
-RUN apt-get update && apt-get install -y xvfb
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    xvfb
 
-# Run everything after as non-privileged user.
+# 9. Run everything after as non-privileged user.
 USER pwuser