diff --git a/ci/images/centos7/Dockerfile b/ci/images/centos7/Dockerfile
index cdcb384f..e057b93d 100644
--- a/ci/images/centos7/Dockerfile
+++ b/ci/images/centos7/Dockerfile
@@ -15,7 +15,6 @@ RUN npm config set python python2
 RUN yum install -y epel-release && yum install -y jq
 RUN yum install -y rsync
 
-# Copied from ../debian10/Dockerfile
 # Install Go.
 RUN ARCH="$(uname -m | sed 's/x86_64/amd64/; s/aarch64/arm64/')" && \
     curl -fsSL "https://dl.google.com/go/go1.14.3.linux-$ARCH.tar.gz" | tar -C /usr/local -xz
diff --git a/ci/images/debian10/Dockerfile b/ci/images/debian10/Dockerfile
deleted file mode 100644
index 397316c2..00000000
--- a/ci/images/debian10/Dockerfile
+++ /dev/null
@@ -1,49 +0,0 @@
-FROM debian:10
-
-RUN apt-get update
-
-# Needed for debian repositories added below.
-RUN apt-get install -y curl gnupg
-
-# Installs node.
-RUN curl -fsSL https://deb.nodesource.com/setup_12.x | bash - && \
-    apt-get install -y nodejs
-
-# Installs yarn.
-RUN curl -fsSL https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
-    echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list && \
-    apt-get update && apt-get install -y yarn
-
-# Installs VS Code build deps.
-RUN apt-get install -y build-essential
-
-# Installs envsubst.
-RUN apt-get install -y gettext-base
-
-# Misc build dependencies.
-RUN apt-get install -y git rsync unzip jq
-
-# Installs shellcheck.
-RUN curl -fsSL https://github.com/koalaman/shellcheck/releases/download/v0.7.1/shellcheck-v0.7.1.linux.$(uname -m).tar.xz | \
-    tar -xJ && \
-    mv shellcheck*/shellcheck /usr/local/bin && \
-    rm -R shellcheck*
-
-# Install Go.
-RUN ARCH="$(uname -m | sed 's/x86_64/amd64/; s/aarch64/arm64/')" && \
-    curl -fsSL "https://dl.google.com/go/go1.14.3.linux-$ARCH.tar.gz" | tar -C /usr/local -xz
-ENV GOPATH=/gopath
-# Ensures running this image as another user works.
-RUN mkdir -p $GOPATH && chmod -R 777 $GOPATH
-ENV PATH=/usr/local/go/bin:$GOPATH/bin:$PATH
-
-# More stable than go get
-RUN curl -sfL https://install.goreleaser.com/github.com/goreleaser/nfpm.sh | sh
-
-RUN VERSION="$(curl -fsSL https://storage.googleapis.com/kubernetes-release/release/stable.txt)" && \
-    curl -fsSL "https://storage.googleapis.com/kubernetes-release/release/$VERSION/bin/linux/amd64/kubectl" > /usr/local/bin/kubectl \
-    && chmod +x /usr/local/bin/kubectl
-RUN curl -fsSL https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash
-RUN helm plugin install https://github.com/instrumenta/helm-kubeval
-
-RUN curl -fsSL https://get.docker.com | sh
diff --git a/docs/CONTRIBUTING.md b/docs/CONTRIBUTING.md
index 15c997fd..5150abaa 100644
--- a/docs/CONTRIBUTING.md
+++ b/docs/CONTRIBUTING.md
@@ -31,14 +31,23 @@ master).
 
 The prerequisites for contributing to code-server are almost the same as those for
 [VS Code](https://github.com/Microsoft/vscode/wiki/How-to-Contribute#prerequisites).
-There are several differences, however. You must:
+There are several differences, however. Here is what is needed:
 
-- Use Node.js version 12.x (or greater)
-- Have [yarn](https://classic.yarnpkg.com/en/) installed (which is used to install JS packages and run development scripts)
-- Have [nfpm](https://github.com/goreleaser/nfpm) (which is used to build `.deb` and `.rpm` packages and [jq](https://stedolan.github.io/jq/) (used to build code-server releases) installed
-
-The [CI container](../ci/images/debian10/Dockerfile) is a useful reference for all
-of the dependencies code-server uses.
+- `node` v12.x or greater
+- `git` v2.x or greater
+- [`yarn`](https://classic.yarnpkg.com/en/)
+  - used to install JS packages and run scripts
+- [`nfpm`](https://classic.yarnpkg.com/en/)
+  - used to build `.deb` and `.rpm` packages
+- [`jq`](https://stedolan.github.io/jq/)
+  - used to build code-server releases
+- [`gnupg`](https://gnupg.org/index.html)
+  - all commits must be signed an verified
+  - see GitHub's ["Managing commit signature verification"](https://docs.github.com/en/github/authenticating-to-github/managing-commit-signature-verification) or follow [this tutorial](https://joeprevite.com/verify-commits-on-github)
+- `build-essential` (Linux)
+  - `apt-get install -y build-essential` - used by VS Code
+- `rsync` and `unzip`
+  - used for code-server releases
 
 ## Development Workflow