diff --git a/.travis.yml b/.travis.yml
index 8b753ccd9..90922a79b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,6 +15,10 @@ matrix:
     - os: windows
       dist: 1803-containers
       env: VERSION=3.7 VARIANT=windows/windowsservercore-1803
+    - os: linux
+      env: VERSION=3.7 VARIANT=buster
+    - os: linux
+      env: VERSION=3.7 VARIANT=buster/slim
     - os: linux
       env: VERSION=3.7 VARIANT=stretch
     - os: linux
@@ -24,25 +28,25 @@ matrix:
     - os: linux
       env: VERSION=3.7 VARIANT=alpine3.9
     - os: linux
-      env: VERSION=3.6 VARIANT=stretch
+      env: VERSION=3.6 VARIANT=buster
     - os: linux
-      env: VERSION=3.6 VARIANT=stretch/slim
+      env: VERSION=3.6 VARIANT=buster/slim
     - os: linux
-      env: VERSION=3.6 VARIANT=jessie
+      env: VERSION=3.6 VARIANT=stretch
     - os: linux
-      env: VERSION=3.6 VARIANT=jessie/slim
+      env: VERSION=3.6 VARIANT=stretch/slim
     - os: linux
       env: VERSION=3.6 VARIANT=alpine3.10
     - os: linux
       env: VERSION=3.6 VARIANT=alpine3.9
     - os: linux
-      env: VERSION=3.5 VARIANT=stretch
+      env: VERSION=3.5 VARIANT=buster
     - os: linux
-      env: VERSION=3.5 VARIANT=stretch/slim
+      env: VERSION=3.5 VARIANT=buster/slim
     - os: linux
-      env: VERSION=3.5 VARIANT=jessie
+      env: VERSION=3.5 VARIANT=stretch
     - os: linux
-      env: VERSION=3.5 VARIANT=jessie/slim
+      env: VERSION=3.5 VARIANT=stretch/slim
     - os: linux
       env: VERSION=3.5 VARIANT=alpine3.10
     - os: linux
@@ -51,13 +55,13 @@ matrix:
       dist: 1803-containers
       env: VERSION=2.7 VARIANT=windows/windowsservercore-1803
     - os: linux
-      env: VERSION=2.7 VARIANT=stretch
+      env: VERSION=2.7 VARIANT=buster
     - os: linux
-      env: VERSION=2.7 VARIANT=stretch/slim
+      env: VERSION=2.7 VARIANT=buster/slim
     - os: linux
-      env: VERSION=2.7 VARIANT=jessie
+      env: VERSION=2.7 VARIANT=stretch
     - os: linux
-      env: VERSION=2.7 VARIANT=jessie/slim
+      env: VERSION=2.7 VARIANT=stretch/slim
     - os: linux
       env: VERSION=2.7 VARIANT=alpine3.10
     - os: linux
diff --git a/2.7/jessie/Dockerfile b/2.7/buster/Dockerfile
similarity index 98%
rename from 2.7/jessie/Dockerfile
rename to 2.7/buster/Dockerfile
index 027de8dd9..e693c6e8b 100644
--- a/2.7/jessie/Dockerfile
+++ b/2.7/buster/Dockerfile
@@ -4,7 +4,7 @@
 # PLEASE DO NOT EDIT IT DIRECTLY.
 #
 
-FROM buildpack-deps:jessie
+FROM buildpack-deps:buster
 
 # ensure local python is preferred over distribution python
 ENV PATH /usr/local/bin:$PATH
diff --git a/2.7/jessie/slim/Dockerfile b/2.7/buster/slim/Dockerfile
similarity index 99%
rename from 2.7/jessie/slim/Dockerfile
rename to 2.7/buster/slim/Dockerfile
index 229b897f0..e08d2a90d 100644
--- a/2.7/jessie/slim/Dockerfile
+++ b/2.7/buster/slim/Dockerfile
@@ -4,7 +4,7 @@
 # PLEASE DO NOT EDIT IT DIRECTLY.
 #
 
-FROM debian:jessie-slim
+FROM debian:buster-slim
 
 # ensure local python is preferred over distribution python
 ENV PATH /usr/local/bin:$PATH
diff --git a/3.5/jessie/Dockerfile b/3.5/buster/Dockerfile
similarity index 99%
rename from 3.5/jessie/Dockerfile
rename to 3.5/buster/Dockerfile
index c6821a78b..b692e2657 100644
--- a/3.5/jessie/Dockerfile
+++ b/3.5/buster/Dockerfile
@@ -4,7 +4,7 @@
 # PLEASE DO NOT EDIT IT DIRECTLY.
 #
 
-FROM buildpack-deps:jessie
+FROM buildpack-deps:buster
 
 # ensure local python is preferred over distribution python
 ENV PATH /usr/local/bin:$PATH
diff --git a/3.5/jessie/slim/Dockerfile b/3.5/buster/slim/Dockerfile
similarity index 99%
rename from 3.5/jessie/slim/Dockerfile
rename to 3.5/buster/slim/Dockerfile
index 360dff1a8..d5d818d80 100644
--- a/3.5/jessie/slim/Dockerfile
+++ b/3.5/buster/slim/Dockerfile
@@ -4,7 +4,7 @@
 # PLEASE DO NOT EDIT IT DIRECTLY.
 #
 
-FROM debian:jessie-slim
+FROM debian:buster-slim
 
 # ensure local python is preferred over distribution python
 ENV PATH /usr/local/bin:$PATH
diff --git a/3.6/buster/Dockerfile b/3.6/buster/Dockerfile
new file mode 100644
index 000000000..b56f1a3f5
--- /dev/null
+++ b/3.6/buster/Dockerfile
@@ -0,0 +1,126 @@
+#
+# NOTE: THIS DOCKERFILE IS GENERATED VIA "update.sh"
+#
+# PLEASE DO NOT EDIT IT DIRECTLY.
+#
+
+FROM buildpack-deps:buster
+
+# ensure local python is preferred over distribution python
+ENV PATH /usr/local/bin:$PATH
+
+# http://bugs.python.org/issue19846
+# > At the moment, setting "LANG=C" on a Linux system *fundamentally breaks Python 3*, and that's not OK.
+ENV LANG C.UTF-8
+
+# extra dependencies (over what buildpack-deps already includes)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+		tk-dev \
+	&& rm -rf /var/lib/apt/lists/*
+
+ENV GPG_KEY 0D96DF4D4110E5C43FBFB17F2D347EA6AA65421D
+ENV PYTHON_VERSION 3.6.9
+
+RUN set -ex \
+	\
+	&& wget -O python.tar.xz "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz" \
+	&& wget -O python.tar.xz.asc "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz.asc" \
+	&& export GNUPGHOME="$(mktemp -d)" \
+	&& gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys "$GPG_KEY" \
+	&& gpg --batch --verify python.tar.xz.asc python.tar.xz \
+	&& { command -v gpgconf > /dev/null && gpgconf --kill all || :; } \
+	&& rm -rf "$GNUPGHOME" python.tar.xz.asc \
+	&& mkdir -p /usr/src/python \
+	&& tar -xJC /usr/src/python --strip-components=1 -f python.tar.xz \
+	&& rm python.tar.xz \
+	\
+	&& cd /usr/src/python \
+	&& gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
+	&& ./configure \
+		--build="$gnuArch" \
+		--enable-loadable-sqlite-extensions \
+		--enable-optimizations \
+		--enable-shared \
+		--with-system-expat \
+		--with-system-ffi \
+		--without-ensurepip \
+	&& make -j "$(nproc)" \
+# https://github.com/docker-library/python/issues/160#issuecomment-509426916
+		PROFILE_TASK='-m test.regrtest --pgo \
+			test_array \
+			test_base64 \
+			test_binascii \
+			test_binhex \
+			test_binop \
+			test_bytes \
+			test_c_locale_coercion \
+			test_class \
+			test_cmath \
+			test_codecs \
+			test_compile \
+			test_complex \
+			test_csv \
+			test_decimal \
+			test_dict \
+			test_float \
+			test_fstring \
+			test_hashlib \
+			test_io \
+			test_iter \
+			test_json \
+			test_long \
+			test_math \
+			test_memoryview \
+			test_pickle \
+			test_re \
+			test_set \
+			test_slice \
+			test_struct \
+			test_threading \
+			test_time \
+			test_traceback \
+			test_unicode \
+		' \
+	&& make install \
+	&& ldconfig \
+	\
+	&& find /usr/local -depth \
+		\( \
+			\( -type d -a \( -name test -o -name tests \) \) \
+			-o \
+			\( -type f -a \( -name '*.pyc' -o -name '*.pyo' \) \) \
+		\) -exec rm -rf '{}' + \
+	&& rm -rf /usr/src/python \
+	\
+	&& python3 --version
+
+# make some useful symlinks that are expected to exist
+RUN cd /usr/local/bin \
+	&& ln -s idle3 idle \
+	&& ln -s pydoc3 pydoc \
+	&& ln -s python3 python \
+	&& ln -s python3-config python-config
+
+# if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
+ENV PYTHON_PIP_VERSION 19.1.1
+
+RUN set -ex; \
+	\
+	wget -O get-pip.py 'https://bootstrap.pypa.io/get-pip.py'; \
+	\
+	python get-pip.py \
+		--disable-pip-version-check \
+		--no-cache-dir \
+		"pip==$PYTHON_PIP_VERSION" \
+	; \
+	pip --version; \
+	\
+	find /usr/local -depth \
+		\( \
+			\( -type d -a \( -name test -o -name tests \) \) \
+			-o \
+			\( -type f -a \( -name '*.pyc' -o -name '*.pyo' \) \) \
+		\) -exec rm -rf '{}' +; \
+	rm -f get-pip.py
+
+CMD ["python3"]
diff --git a/3.6/buster/slim/Dockerfile b/3.6/buster/slim/Dockerfile
new file mode 100644
index 000000000..a01bcdcf6
--- /dev/null
+++ b/3.6/buster/slim/Dockerfile
@@ -0,0 +1,170 @@
+#
+# NOTE: THIS DOCKERFILE IS GENERATED VIA "update.sh"
+#
+# PLEASE DO NOT EDIT IT DIRECTLY.
+#
+
+FROM debian:buster-slim
+
+# ensure local python is preferred over distribution python
+ENV PATH /usr/local/bin:$PATH
+
+# http://bugs.python.org/issue19846
+# > At the moment, setting "LANG=C" on a Linux system *fundamentally breaks Python 3*, and that's not OK.
+ENV LANG C.UTF-8
+
+# runtime dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+		ca-certificates \
+		netbase \
+	&& rm -rf /var/lib/apt/lists/*
+
+ENV GPG_KEY 0D96DF4D4110E5C43FBFB17F2D347EA6AA65421D
+ENV PYTHON_VERSION 3.6.9
+
+RUN set -ex \
+	\
+	&& savedAptMark="$(apt-mark showmanual)" \
+	&& apt-get update && apt-get install -y --no-install-recommends \
+		dpkg-dev \
+		gcc \
+		libbz2-dev \
+		libc6-dev \
+		libexpat1-dev \
+		libffi-dev \
+		libgdbm-dev \
+		liblzma-dev \
+		libncursesw5-dev \
+		libreadline-dev \
+		libsqlite3-dev \
+		libssl-dev \
+		make \
+		tk-dev \
+		wget \
+		xz-utils \
+		zlib1g-dev \
+# as of Stretch, "gpg" is no longer included by default
+		$(command -v gpg > /dev/null || echo 'gnupg dirmngr') \
+	\
+	&& wget -O python.tar.xz "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz" \
+	&& wget -O python.tar.xz.asc "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz.asc" \
+	&& export GNUPGHOME="$(mktemp -d)" \
+	&& gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys "$GPG_KEY" \
+	&& gpg --batch --verify python.tar.xz.asc python.tar.xz \
+	&& { command -v gpgconf > /dev/null && gpgconf --kill all || :; } \
+	&& rm -rf "$GNUPGHOME" python.tar.xz.asc \
+	&& mkdir -p /usr/src/python \
+	&& tar -xJC /usr/src/python --strip-components=1 -f python.tar.xz \
+	&& rm python.tar.xz \
+	\
+	&& cd /usr/src/python \
+	&& gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
+	&& ./configure \
+		--build="$gnuArch" \
+		--enable-loadable-sqlite-extensions \
+		--enable-optimizations \
+		--enable-shared \
+		--with-system-expat \
+		--with-system-ffi \
+		--without-ensurepip \
+	&& make -j "$(nproc)" \
+# https://github.com/docker-library/python/issues/160#issuecomment-509426916
+		PROFILE_TASK='-m test.regrtest --pgo \
+			test_array \
+			test_base64 \
+			test_binascii \
+			test_binhex \
+			test_binop \
+			test_bytes \
+			test_c_locale_coercion \
+			test_class \
+			test_cmath \
+			test_codecs \
+			test_compile \
+			test_complex \
+			test_csv \
+			test_decimal \
+			test_dict \
+			test_float \
+			test_fstring \
+			test_hashlib \
+			test_io \
+			test_iter \
+			test_json \
+			test_long \
+			test_math \
+			test_memoryview \
+			test_pickle \
+			test_re \
+			test_set \
+			test_slice \
+			test_struct \
+			test_threading \
+			test_time \
+			test_traceback \
+			test_unicode \
+		' \
+	&& make install \
+	&& ldconfig \
+	\
+	&& apt-mark auto '.*' > /dev/null \
+	&& apt-mark manual $savedAptMark \
+	&& find /usr/local -type f -executable -not \( -name '*tkinter*' \) -exec ldd '{}' ';' \
+		| awk '/=>/ { print $(NF-1) }' \
+		| sort -u \
+		| xargs -r dpkg-query --search \
+		| cut -d: -f1 \
+		| sort -u \
+		| xargs -r apt-mark manual \
+	&& apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false \
+	&& rm -rf /var/lib/apt/lists/* \
+	\
+	&& find /usr/local -depth \
+		\( \
+			\( -type d -a \( -name test -o -name tests \) \) \
+			-o \
+			\( -type f -a \( -name '*.pyc' -o -name '*.pyo' \) \) \
+		\) -exec rm -rf '{}' + \
+	&& rm -rf /usr/src/python \
+	\
+	&& python3 --version
+
+# make some useful symlinks that are expected to exist
+RUN cd /usr/local/bin \
+	&& ln -s idle3 idle \
+	&& ln -s pydoc3 pydoc \
+	&& ln -s python3 python \
+	&& ln -s python3-config python-config
+
+# if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
+ENV PYTHON_PIP_VERSION 19.1.1
+
+RUN set -ex; \
+	\
+	savedAptMark="$(apt-mark showmanual)"; \
+	apt-get update; \
+	apt-get install -y --no-install-recommends wget; \
+	\
+	wget -O get-pip.py 'https://bootstrap.pypa.io/get-pip.py'; \
+	\
+	apt-mark auto '.*' > /dev/null; \
+	[ -z "$savedAptMark" ] || apt-mark manual $savedAptMark; \
+	apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
+	rm -rf /var/lib/apt/lists/*; \
+	\
+	python get-pip.py \
+		--disable-pip-version-check \
+		--no-cache-dir \
+		"pip==$PYTHON_PIP_VERSION" \
+	; \
+	pip --version; \
+	\
+	find /usr/local -depth \
+		\( \
+			\( -type d -a \( -name test -o -name tests \) \) \
+			-o \
+			\( -type f -a \( -name '*.pyc' -o -name '*.pyo' \) \) \
+		\) -exec rm -rf '{}' +; \
+	rm -f get-pip.py
+
+CMD ["python3"]
diff --git a/3.7/buster/Dockerfile b/3.7/buster/Dockerfile
new file mode 100644
index 000000000..bb5bd0bd1
--- /dev/null
+++ b/3.7/buster/Dockerfile
@@ -0,0 +1,127 @@
+#
+# NOTE: THIS DOCKERFILE IS GENERATED VIA "update.sh"
+#
+# PLEASE DO NOT EDIT IT DIRECTLY.
+#
+
+FROM buildpack-deps:buster
+
+# ensure local python is preferred over distribution python
+ENV PATH /usr/local/bin:$PATH
+
+# http://bugs.python.org/issue19846
+# > At the moment, setting "LANG=C" on a Linux system *fundamentally breaks Python 3*, and that's not OK.
+ENV LANG C.UTF-8
+
+# extra dependencies (over what buildpack-deps already includes)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+		tk-dev \
+		uuid-dev \
+	&& rm -rf /var/lib/apt/lists/*
+
+ENV GPG_KEY 0D96DF4D4110E5C43FBFB17F2D347EA6AA65421D
+ENV PYTHON_VERSION 3.7.4
+
+RUN set -ex \
+	\
+	&& wget -O python.tar.xz "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz" \
+	&& wget -O python.tar.xz.asc "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz.asc" \
+	&& export GNUPGHOME="$(mktemp -d)" \
+	&& gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys "$GPG_KEY" \
+	&& gpg --batch --verify python.tar.xz.asc python.tar.xz \
+	&& { command -v gpgconf > /dev/null && gpgconf --kill all || :; } \
+	&& rm -rf "$GNUPGHOME" python.tar.xz.asc \
+	&& mkdir -p /usr/src/python \
+	&& tar -xJC /usr/src/python --strip-components=1 -f python.tar.xz \
+	&& rm python.tar.xz \
+	\
+	&& cd /usr/src/python \
+	&& gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
+	&& ./configure \
+		--build="$gnuArch" \
+		--enable-loadable-sqlite-extensions \
+		--enable-optimizations \
+		--enable-shared \
+		--with-system-expat \
+		--with-system-ffi \
+		--without-ensurepip \
+	&& make -j "$(nproc)" \
+# https://github.com/docker-library/python/issues/160#issuecomment-509426916
+		PROFILE_TASK='-m test.regrtest --pgo \
+			test_array \
+			test_base64 \
+			test_binascii \
+			test_binhex \
+			test_binop \
+			test_bytes \
+			test_c_locale_coercion \
+			test_class \
+			test_cmath \
+			test_codecs \
+			test_compile \
+			test_complex \
+			test_csv \
+			test_decimal \
+			test_dict \
+			test_float \
+			test_fstring \
+			test_hashlib \
+			test_io \
+			test_iter \
+			test_json \
+			test_long \
+			test_math \
+			test_memoryview \
+			test_pickle \
+			test_re \
+			test_set \
+			test_slice \
+			test_struct \
+			test_threading \
+			test_time \
+			test_traceback \
+			test_unicode \
+		' \
+	&& make install \
+	&& ldconfig \
+	\
+	&& find /usr/local -depth \
+		\( \
+			\( -type d -a \( -name test -o -name tests \) \) \
+			-o \
+			\( -type f -a \( -name '*.pyc' -o -name '*.pyo' \) \) \
+		\) -exec rm -rf '{}' + \
+	&& rm -rf /usr/src/python \
+	\
+	&& python3 --version
+
+# make some useful symlinks that are expected to exist
+RUN cd /usr/local/bin \
+	&& ln -s idle3 idle \
+	&& ln -s pydoc3 pydoc \
+	&& ln -s python3 python \
+	&& ln -s python3-config python-config
+
+# if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
+ENV PYTHON_PIP_VERSION 19.1.1
+
+RUN set -ex; \
+	\
+	wget -O get-pip.py 'https://bootstrap.pypa.io/get-pip.py'; \
+	\
+	python get-pip.py \
+		--disable-pip-version-check \
+		--no-cache-dir \
+		"pip==$PYTHON_PIP_VERSION" \
+	; \
+	pip --version; \
+	\
+	find /usr/local -depth \
+		\( \
+			\( -type d -a \( -name test -o -name tests \) \) \
+			-o \
+			\( -type f -a \( -name '*.pyc' -o -name '*.pyo' \) \) \
+		\) -exec rm -rf '{}' +; \
+	rm -f get-pip.py
+
+CMD ["python3"]
diff --git a/3.7/buster/slim/Dockerfile b/3.7/buster/slim/Dockerfile
new file mode 100644
index 000000000..9cf0c19a6
--- /dev/null
+++ b/3.7/buster/slim/Dockerfile
@@ -0,0 +1,171 @@
+#
+# NOTE: THIS DOCKERFILE IS GENERATED VIA "update.sh"
+#
+# PLEASE DO NOT EDIT IT DIRECTLY.
+#
+
+FROM debian:buster-slim
+
+# ensure local python is preferred over distribution python
+ENV PATH /usr/local/bin:$PATH
+
+# http://bugs.python.org/issue19846
+# > At the moment, setting "LANG=C" on a Linux system *fundamentally breaks Python 3*, and that's not OK.
+ENV LANG C.UTF-8
+
+# runtime dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+		ca-certificates \
+		netbase \
+	&& rm -rf /var/lib/apt/lists/*
+
+ENV GPG_KEY 0D96DF4D4110E5C43FBFB17F2D347EA6AA65421D
+ENV PYTHON_VERSION 3.7.4
+
+RUN set -ex \
+	\
+	&& savedAptMark="$(apt-mark showmanual)" \
+	&& apt-get update && apt-get install -y --no-install-recommends \
+		dpkg-dev \
+		gcc \
+		libbz2-dev \
+		libc6-dev \
+		libexpat1-dev \
+		libffi-dev \
+		libgdbm-dev \
+		liblzma-dev \
+		libncursesw5-dev \
+		libreadline-dev \
+		libsqlite3-dev \
+		libssl-dev \
+		make \
+		tk-dev \
+		uuid-dev \
+		wget \
+		xz-utils \
+		zlib1g-dev \
+# as of Stretch, "gpg" is no longer included by default
+		$(command -v gpg > /dev/null || echo 'gnupg dirmngr') \
+	\
+	&& wget -O python.tar.xz "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz" \
+	&& wget -O python.tar.xz.asc "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz.asc" \
+	&& export GNUPGHOME="$(mktemp -d)" \
+	&& gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys "$GPG_KEY" \
+	&& gpg --batch --verify python.tar.xz.asc python.tar.xz \
+	&& { command -v gpgconf > /dev/null && gpgconf --kill all || :; } \
+	&& rm -rf "$GNUPGHOME" python.tar.xz.asc \
+	&& mkdir -p /usr/src/python \
+	&& tar -xJC /usr/src/python --strip-components=1 -f python.tar.xz \
+	&& rm python.tar.xz \
+	\
+	&& cd /usr/src/python \
+	&& gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
+	&& ./configure \
+		--build="$gnuArch" \
+		--enable-loadable-sqlite-extensions \
+		--enable-optimizations \
+		--enable-shared \
+		--with-system-expat \
+		--with-system-ffi \
+		--without-ensurepip \
+	&& make -j "$(nproc)" \
+# https://github.com/docker-library/python/issues/160#issuecomment-509426916
+		PROFILE_TASK='-m test.regrtest --pgo \
+			test_array \
+			test_base64 \
+			test_binascii \
+			test_binhex \
+			test_binop \
+			test_bytes \
+			test_c_locale_coercion \
+			test_class \
+			test_cmath \
+			test_codecs \
+			test_compile \
+			test_complex \
+			test_csv \
+			test_decimal \
+			test_dict \
+			test_float \
+			test_fstring \
+			test_hashlib \
+			test_io \
+			test_iter \
+			test_json \
+			test_long \
+			test_math \
+			test_memoryview \
+			test_pickle \
+			test_re \
+			test_set \
+			test_slice \
+			test_struct \
+			test_threading \
+			test_time \
+			test_traceback \
+			test_unicode \
+		' \
+	&& make install \
+	&& ldconfig \
+	\
+	&& apt-mark auto '.*' > /dev/null \
+	&& apt-mark manual $savedAptMark \
+	&& find /usr/local -type f -executable -not \( -name '*tkinter*' \) -exec ldd '{}' ';' \
+		| awk '/=>/ { print $(NF-1) }' \
+		| sort -u \
+		| xargs -r dpkg-query --search \
+		| cut -d: -f1 \
+		| sort -u \
+		| xargs -r apt-mark manual \
+	&& apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false \
+	&& rm -rf /var/lib/apt/lists/* \
+	\
+	&& find /usr/local -depth \
+		\( \
+			\( -type d -a \( -name test -o -name tests \) \) \
+			-o \
+			\( -type f -a \( -name '*.pyc' -o -name '*.pyo' \) \) \
+		\) -exec rm -rf '{}' + \
+	&& rm -rf /usr/src/python \
+	\
+	&& python3 --version
+
+# make some useful symlinks that are expected to exist
+RUN cd /usr/local/bin \
+	&& ln -s idle3 idle \
+	&& ln -s pydoc3 pydoc \
+	&& ln -s python3 python \
+	&& ln -s python3-config python-config
+
+# if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
+ENV PYTHON_PIP_VERSION 19.1.1
+
+RUN set -ex; \
+	\
+	savedAptMark="$(apt-mark showmanual)"; \
+	apt-get update; \
+	apt-get install -y --no-install-recommends wget; \
+	\
+	wget -O get-pip.py 'https://bootstrap.pypa.io/get-pip.py'; \
+	\
+	apt-mark auto '.*' > /dev/null; \
+	[ -z "$savedAptMark" ] || apt-mark manual $savedAptMark; \
+	apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
+	rm -rf /var/lib/apt/lists/*; \
+	\
+	python get-pip.py \
+		--disable-pip-version-check \
+		--no-cache-dir \
+		"pip==$PYTHON_PIP_VERSION" \
+	; \
+	pip --version; \
+	\
+	find /usr/local -depth \
+		\( \
+			\( -type d -a \( -name test -o -name tests \) \) \
+			-o \
+			\( -type f -a \( -name '*.pyc' -o -name '*.pyo' \) \) \
+		\) -exec rm -rf '{}' +; \
+	rm -f get-pip.py
+
+CMD ["python3"]
diff --git a/generate-stackbrew-library.sh b/generate-stackbrew-library.sh
index a612ec014..8f8d36d77 100755
--- a/generate-stackbrew-library.sh
+++ b/generate-stackbrew-library.sh
@@ -7,9 +7,9 @@ declare -A aliases=(
 	[2.7]='2'
 )
 
-defaultDebianSuite='stretch' # TODO buster
+defaultDebianSuite='buster' # TODO buster
 declare -A debianSuites=(
-	[3.8-rc]='buster'
+	#[3.8-rc]='buster'
 )
 defaultAlpineVersion='3.10'
 
@@ -79,7 +79,7 @@ for version in "${versions[@]}"; do
 	rcVersion="${version%-rc}"
 
 	for v in \
-		{buster,stretch,jessie}{,/slim} \
+		{buster,stretch}{,/slim} \
 		alpine{3.10,3.9} \
 		windows/windowsservercore-{ltsc2016,1803,1809} \
 	; do
diff --git a/update.sh b/update.sh
index c2bf2af46..5678a5b68 100755
--- a/update.sh
+++ b/update.sh
@@ -114,7 +114,7 @@ for version in "${versions[@]}"; do
 
 	for v in \
 		alpine{3.9,3.10} \
-		{jessie,stretch,buster}{/slim,} \
+		{stretch,buster}{/slim,} \
 		windows/windowsservercore-{1809,1803,ltsc2016} \
 	; do
 		dir="$version/$v"
@@ -164,7 +164,7 @@ for version in "${versions[@]}"; do
 			3.[5-6]*)
 				sed -ri -e '/uuid-dev/d' "$dir/Dockerfile"
 				;;& # (other Debian variants need to match later blocks)
-			*/buster | */stretch | */jessie)
+			*/buster | */stretch)
 				# buildpack-deps already includes libssl-dev
 				sed -ri -e '/libssl-dev/d' "$dir/Dockerfile"
 				;;

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