diff --git a/.travis.yml b/.travis.yml
index 1c886bea0..63ab9827c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -36,12 +36,6 @@ cache:
 #   https://github.com/travis-ci/travis-ci/issues/5142
 matrix:
   include:
-    - env: ['os_image=ubuntu:14.04', gcc_version=4.9]
-      services: [docker]
-    # Unlike 14.04, this Debian Stable has 4.9 as the system compiler, so
-    # there is no risk of 4.8/4.9 ABI incompatibilities.
-    - env: ['os_image=debian:8.6', gcc_version=4.9]
-      services: [docker]
     - env: ['os_image=ubuntu:16.04', gcc_version=5]
       services: [docker]
 
diff --git a/build/fbcode_builder/fbcode_builder.py b/build/fbcode_builder/fbcode_builder.py
index fa38bf0cc..0580d4305 100644
--- a/build/fbcode_builder/fbcode_builder.py
+++ b/build/fbcode_builder/fbcode_builder.py
@@ -216,14 +216,6 @@ class FBCodeBuilder(object):
         ]
         gcc_version = self.option('gcc_version')
 
-        # We need some extra packages to be able to install GCC 4.9 on 14.04.
-        if self.option('os_image') == 'ubuntu:14.04' and gcc_version == '4.9':
-            actions.append(self.run(ShellQuoted(
-                'apt-get install -yq software-properties-common && '
-                'add-apt-repository ppa:ubuntu-toolchain-r/test && '
-                'apt-get update'
-            )))
-
         # Make the selected GCC the default before building anything
         actions.extend([
             self.run(ShellQuoted('apt-get install -yq {c} {cpp}').format(
@@ -240,24 +232,6 @@ class FBCodeBuilder(object):
             self.run(ShellQuoted('update-alternatives --config gcc')),
         ])
 
-        # Ubuntu 14.04 comes with a CMake version that is too old for mstch.
-        if self.option('os_image') == 'ubuntu:14.04':
-            actions.append(self.run(ShellQuoted(
-                'apt-get install -yq software-properties-common && '
-                'add-apt-repository ppa:george-edison55/cmake-3.x && '
-                'apt-get update && '
-                'apt-get upgrade -yq cmake'
-            )))
-
-        # Debian 8.6 comes with a CMake version that is too old for folly.
-        if self.option('os_image') == 'debian:8.6':
-            actions.append(self.run(ShellQuoted(
-                'echo deb http://ftp.debian.org/debian jessie-backports main '
-                '>> /etc/apt/sources.list.d/jessie-backports.list && '
-                'apt-get update && '
-                'apt-get -yq -t jessie-backports install cmake'
-            )))
-
         actions.extend(self.debian_ccache_setup_steps())
 
         return self.step('Install packages for Debian-based OS', actions)
diff --git a/build/fbcode_builder/make_docker_context.py b/build/fbcode_builder/make_docker_context.py
index fc28beb4e..9adf9ce0d 100755
--- a/build/fbcode_builder/make_docker_context.py
+++ b/build/fbcode_builder/make_docker_context.py
@@ -43,7 +43,7 @@ def make_docker_context(
         opts = {}
 
     valid_versions = (
-        ('ubuntu:14.04', '4.9'), ('ubuntu:16.04', '5'), ('debian:8.6', '4.9')
+        ('ubuntu:16.04', '5'),
     )
 
     def add_args(parser):
@@ -69,14 +69,14 @@ def make_docker_context(
         )
         parser.add_argument(
             '--os-image', metavar='IMG', choices=zip(*valid_versions)[0],
-            default=opts.get('os_image', 'debian:8.6'),
+            default=opts.get('os_image', valid_versions[0][0]),
             help='Docker OS image -- be sure to use only ones you trust (See '
                 'README.docker). Choices: %(choices)s. Default: %(default)s.',
         )
         parser.add_argument(
             '--gcc-version', metavar='VER',
             choices=set(zip(*valid_versions)[1]),
-            default=opts.get('gcc_version', '4.9'),
+            default=opts.get('gcc_version', valid_versions[0][1]),
             help='Choices: %(choices)s. Default: %(default)s.',
         )
         parser.add_argument(