diff --git a/CHANGES.md b/CHANGES.md
index 1bf9514ac2..9b9a6263bd 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,33 @@
+Synapse 1.30.1 (2021-03-26)
+===========================
+
+This release is identical to Synapse 1.30.0, with the exception of explicitly
+setting a minimum version of Python's Cryptography library to ensure that users
+of Synapse are protected from the recent [OpenSSL security advisories](https://mta.openssl.org/pipermail/openssl-announce/2021-March/000198.html),
+especially CVE-2021-3449.
+
+Note that Cryptography defaults to bundling its own statically linked copy of
+OpenSSL, which means that you may not be protected by your operating system's
+security updates.
+
+It's also worth noting that Cryptography no longer supports Python 3.5, so
+admins deploying to older environments may not be protected against this or
+future vulnerabilities. Synapse will be dropping support for Python 3.5 at the
+end of March.
+
+
+Updates to the Docker image
+---------------------------
+
+- Ensure that the docker container has up to date versions of openssl. ([\#9697](https://github.com/matrix-org/synapse/issues/9697))
+
+
+Internal Changes
+----------------
+
+- Enforce that `cryptography` dependency is up to date to ensure it has the most recent openssl patches. ([\#9697](https://github.com/matrix-org/synapse/issues/9697))
+
+
 Synapse 1.30.0 (2021-03-22)
 ===========================
 
diff --git a/debian/changelog b/debian/changelog
index e6b2122d6f..18dc04cd82 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.30.1) stable; urgency=medium
+
+  * New synapse release 1.30.1.
+
+ -- Synapse Packaging team <packages@matrix.org>  Fri, 26 Mar 2021 12:01:28 +0000
+
 matrix-synapse-py3 (1.30.0) stable; urgency=medium
 
   * New synapse release 1.30.0.
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 7cd4dd7d1e..a442b34598 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -25,17 +25,18 @@ LABEL org.opencontainers.image.licenses='Apache-2.0'
 
 # install the OS build deps
 RUN apt-get update && apt-get install -y \
-    build-essential \
-    libffi-dev \
-    libjpeg-dev \
-    libpq-dev \
-    libssl-dev \
-    libwebp-dev \
-    libxml++2.6-dev \
-    libxslt1-dev \
-    rustc \
-    zlib1g-dev \
- && rm -rf /var/lib/apt/lists/*
+        build-essential \
+        libffi-dev \
+        libjpeg-dev \
+        libpq-dev \
+        libssl-dev \
+        libwebp-dev \
+        libxml++2.6-dev \
+        libxslt1-dev \
+        openssl \
+        rustc \
+        zlib1g-dev \
+        && rm -rf /var/lib/apt/lists/*
 
 # Build dependencies that are not available as wheels, to speed up rebuilds
 RUN pip install --prefix="/install" --no-warn-script-location \
@@ -68,14 +69,16 @@ RUN pip install --prefix="/install" --no-warn-script-location \
 FROM docker.io/python:${PYTHON_VERSION}-slim
 
 RUN apt-get update && apt-get install -y \
-    curl \
-    gosu \
-    libjpeg62-turbo \
-    libpq5 \
-    libwebp6 \
-    xmlsec1 \
-    libjemalloc2 \
- && rm -rf /var/lib/apt/lists/*
+        curl \
+        gosu \
+        libjpeg62-turbo \
+        libpq5 \
+        libwebp6 \
+        xmlsec1 \
+        libjemalloc2 \
+        libssl-dev \
+        openssl \
+        && rm -rf /var/lib/apt/lists/*
 
 COPY --from=builder /install /usr/local
 COPY ./docker/start.py /start.py
@@ -88,4 +91,4 @@ EXPOSE 8008/tcp 8009/tcp 8448/tcp
 ENTRYPOINT ["/start.py"]
 
 HEALTHCHECK --interval=1m --timeout=5s \
-  CMD curl -fSs http://localhost:8008/health || exit 1
+        CMD curl -fSs http://localhost:8008/health || exit 1
diff --git a/synapse/__init__.py b/synapse/__init__.py
index 8e57739cd2..c9bc8fb9e9 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -48,7 +48,7 @@ try:
 except ImportError:
     pass
 
-__version__ = "1.30.0"
+__version__ = "1.30.1"
 
 if bool(os.environ.get("SYNAPSE_TEST_PATCH_LOG_CONTEXTS", False)):
     # We import here so that we don't have to install a bunch of deps when
diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
index 321a333820..14ddaed026 100644
--- a/synapse/python_dependencies.py
+++ b/synapse/python_dependencies.py
@@ -82,6 +82,9 @@ REQUIREMENTS = [
     "Jinja2>=2.9",
     "bleach>=1.4.3",
     "typing-extensions>=3.7.4",
+    # We enforce that we have a `cryptography` version that bundles an `openssl`
+    # with the latest security patches.
+    "cryptography>=3.4.7;python_version>='3.6'",
 ]
 
 CONDITIONAL_REQUIREMENTS = {