diff --git a/Changes.md b/Changes.md
index 20b177a..1a3a37e 100644
--- a/Changes.md
+++ b/Changes.md
@@ -37,6 +37,22 @@
   - Updated `inkscape` to 1.3.2.
   - Updated `scons` to 4.6.0.
 
+2.1.1
+=====
+
+- Dockerfile :
+  - Fixed issues with `github` module on CI by installing `urllib3` 1.26.18.
+
+2.1.0
+=====
+
+- Dockerfile :
+  - Added `GAFFER_BUILD_ENVIRONMENT="gcc9"` environment variable.
+  - Added `sqlite-devel` package necessary for building Python with `sqlite3` support.
+  - Added `openssl-devel` and `openssl11-devel` packages necessary for building Python with support for OpenSSL 1.1.1.
+  - Updated SCons to 4.6.0.
+  - Updated CMake to 3.27.2.
+
 2.0.0
 =====
 
diff --git a/build.py b/build.py
index 5913931..ffe5e36 100755
--- a/build.py
+++ b/build.py
@@ -47,20 +47,6 @@
 
 parser = argparse.ArgumentParser()
 
-parser.add_argument(
-	"--build-env-version",
-	dest = "buildEnvVersion",
-	default = "3.0.0a4",
-	help = "The container image tag to use for docker builds."
-)
-
-parser.add_argument(
-	"--build-env-image",
-	dest = "buildEnvImage",
-	default = "ghcr.io/gafferhq/build/build",
-	help = "The container image to use for docker builds."
-)
-
 parser.add_argument(
 	"--organisation",
 	default = "GafferHQ",
@@ -122,6 +108,20 @@
 	       "known build platform so that builds are repeatable."
 )
 
+parser.add_argument(
+	"--docker-image",
+	dest = "dockerImage",
+	default = "ghcr.io/gafferhq/build/build",
+	help = "The container image to use for docker builds."
+)
+
+parser.add_argument(
+	"--docker-image-version",
+	dest = "dockerImageVersion",
+	default = "3.0.0a4",
+	help = "The Docker image tag to use for Docker builds."
+)
+
 parser.add_argument(
 	"--interactive",
 	type = distutils.util.strtobool,
@@ -175,8 +175,19 @@
 		parser.exit( 1, "{0} not found\n".format( renderManLib ) )
 
 # Build a little dictionary of variables we'll need over and over again
-# in string formatting operations, and use it to figure out what
-# package we will eventually be generating.
+# in string formatting operations, and use it to figure out the name
+# for the package we will eventually be generating.
+
+if args.docker :
+	# If we're going to build with Docker, make sure we're using the
+	# same value for `GAFFER_BUILD_ENVIRONMENT`.
+	subprocess.check_call( [ "docker", "pull", "{}:{}".format( args.dockerImage, args.dockerImageVersion ) ] )
+	dockerInfo = subprocess.check_output(
+		[ "docker", "image", "inspect", "{}:{}".format( args.dockerImage, args.dockerImageVersion ) ]
+	)
+	for env in json.loads( dockerInfo )[0]["Config"]["Env"] :
+		if env.startswith( "GAFFER_BUILD_ENVIRONMENT=" ) :
+			os.environ["GAFFER_BUILD_ENVIRONMENT"] = env.partition( "=" )[2]
 
 formatVariables = {
 	"organisation" : args.organisation,
@@ -184,6 +195,7 @@
 	"version" : args.version,
 	"upload" : args.upload,
 	"platform" : platform,
+	"buildEnvironment" : "-{}".format( os.environ["GAFFER_BUILD_ENVIRONMENT"] ) if "GAFFER_BUILD_ENVIRONMENT" in os.environ else "",
 	"arnoldRoot" : args.arnoldRoot,
 	"delight" : args.delightRoot,
 	"renderManRoot" : args.renderManRoot,
@@ -197,9 +209,9 @@
 	formatVariables[ "auth" ] = '-H "Authorization: token %s"' % githubToken
 
 if args.project == "gaffer" :
-	formatVariables["uploadFile"] = "{project}-{version}-{platform}.tar.gz".format( **formatVariables )
+	formatVariables["buildName"] = "{project}-{version}-{platform}".format( **formatVariables )
 else :
-	formatVariables["uploadFile"] = "gafferDependencies-{version}-{platform}.tar.gz".format( **formatVariables )
+	formatVariables["buildName"] = "gafferDependencies-{version}-{platform}{buildEnvironment}".format( **formatVariables )
 
 # If we're going to be doing an upload, then check that the release exists. Better
 # to find out now than at the end of a lengthy build.
@@ -220,9 +232,9 @@ def releaseId() :
 
 # Restart ourselves inside a Docker container so that we use a repeatable
 # build environment.
-if args.docker and not os.path.exists( "/.dockerenv" ) :
+if args.docker :
 
-	image = "%s:%s" % ( args.buildEnvImage, args.buildEnvVersion )
+	image = "%s:%s" % ( args.dockerImage, args.dockerImageVersion )
 	containerName = "gafferhq-build-{id}".format( id = uuid.uuid1() )
 
 	# We don't keep build.py in the images (otherwise we'd have to maintain
@@ -267,7 +279,7 @@ def releaseId() :
 	if args.interactive :
 		containerCommand = "env {env} bash".format( env = containerEnv )
 	else :
-		containerCommand = "env {env} bash -c '/build.py --organisation {organisation} --project {project} --version {version} --upload {upload}'".format( env = containerEnv, **formatVariables )
+		containerCommand = "env {env} bash -c '/build.py --docker 0 --organisation {organisation} --project {project} --version {version} --upload {upload}'".format( env = containerEnv, **formatVariables )
 
 	dockerCommand = "docker run --cap-add=SYS_PTRACE -it {mounts} --name {name} {image}-run {command}".format(
 		mounts = containerMounts,
@@ -280,7 +292,7 @@ def releaseId() :
 
 	if not args.interactive :
 		# Copy out the generated package.
-		copyCommand = "docker cp {container}:/{project}-{version}-source/{uploadFile} ./".format(
+		copyCommand = "docker cp {container}:/{project}-{version}-source/{buildName}.tar.gz ./".format(
 			container = containerName,
 			**formatVariables
 		)
@@ -338,13 +350,13 @@ def releaseId() :
 	# preferred python from the environment. SCons itself
 	# unfortunately hardcodes `/usr/bin/python`, which might not
 	# have the modules we need to build the docs.
-	buildCommand = "python `which scons` package PACKAGE_FILE={uploadFile} ENV_VARS_TO_IMPORT=PATH DELIGHT_ROOT={delight} ARNOLD_ROOT={arnoldRoot} RENDERMAN_ROOT={renderManRoot} OPTIONS='' -j {cpus}".format(
+	buildCommand = "python `which scons` package PACKAGE_FILE={buildName}.tar.gz ENV_VARS_TO_IMPORT=PATH DELIGHT_ROOT={delight} ARNOLD_ROOT={arnoldRoot} RENDERMAN_ROOT={renderManRoot} OPTIONS='' -j {cpus}".format(
 		cpus=multiprocessing.cpu_count(), **formatVariables
 	)
 
 else :
 
-	buildCommand = "env RMAN_ROOT={delight} ARNOLD_ROOT={arnoldRoot} ./build.py --buildDir {cwd}/gafferDependenciesBuild".format(
+	buildCommand = "env RMAN_ROOT={delight} ARNOLD_ROOT={arnoldRoot} ./build.py --buildDir {cwd}/{buildName} --package {cwd}/{buildName}.tar.gz".format(
 		cwd = os.getcwd(),
 		**formatVariables
 	)
@@ -359,12 +371,11 @@ def releaseId() :
 	uploadCommand = (
 		'curl {auth}'
 		' -H "Content-Type: application/zip"'
-		' --data-binary @{uploadFile} "{uploadURL}"'
+		' --data-binary @{buildName}.tar.gz "{uploadURL}"'
 		' -o /tmp/curlResult.txt' # Must specify output file in order to get progress output
 	).format(
-		uploadURL = "https://uploads.github.com/repos/{organisation}/{project}/releases/{id}/assets?name={uploadName}".format(
+		uploadURL = "https://uploads.github.com/repos/{organisation}/{project}/releases/{id}/assets?name={buildName}.tar.gz".format(
 			id = releaseId(),
-			uploadName = os.path.basename( formatVariables["uploadFile"] ),
 			**formatVariables
 		),
 		**formatVariables