diff --git a/Dockerfile b/Dockerfile
index 5024390..f0c246a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@
 #
 # For more information:
 # https://github.com/python/cpython/blob/3.12/Lib/configparser.py
-FROM python:3.11.6-bullseye
+FROM python:3.11.8-bookworm
 
 ###
 # For a list of pre-defined annotation keys and value types see:
diff --git a/README.md b/README.md
index f489fb4..5adc398 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ expects the secrets in a different location.
 To run the `cisagov/trustymail_reporter` image via Docker:
 
 ```console
-docker run cisagov/trustymail_reporter:1.5.4
+docker run cisagov/trustymail_reporter:1.5.5
 ```
 
 ### Running with Docker Compose ###
@@ -43,7 +43,7 @@ docker run cisagov/trustymail_reporter:1.5.4
 
     services:
       trustymail_reporter:
-        image: cisagov/trustymail_reporter:1.5.4
+        image: cisagov/trustymail_reporter:1.5.5
         volumes:
           - type: bind
             source: <your_log_dir>
@@ -102,7 +102,7 @@ environment variables.  See the
 
     services:
       trustymail_reporter:
-        image: cisagov/trustymail_reporter:1.5.4
+        image: cisagov/trustymail_reporter:1.5.5
         volumes:
           - type: bind
             source: <your_log_dir>
@@ -141,7 +141,7 @@ environment variables.  See the
 1. Pull the new image:
 
     ```console
-    docker pull cisagov/trustymail_reporter:1.5.4
+    docker pull cisagov/trustymail_reporter:1.5.5
     ```
 
 1. Recreate and run the container by following the [previous instructions](#running-with-docker).
@@ -151,11 +151,11 @@ environment variables.  See the
 The images of this container are tagged with [semantic
 versions](https://semver.org) of the underlying example project that they
 containerize.  It is recommended that most users use a version tag (e.g.
-`:1.5.4`).
+`:1.5.5`).
 
 | Image:tag | Description |
 |-----------|-------------|
-|`cisagov/trustymail_reporter:1.5.4`| An exact release version. |
+|`cisagov/trustymail_reporter:1.5.5`| An exact release version. |
 |`cisagov/trustymail_reporter:1.5`| The most recent release matching the major and minor version numbers. |
 |`cisagov/trustymail_reporter:1`| The most recent release matching the major version number. |
 |`cisagov/trustymail_reporter:edge` | The most recent image built from a merge into the `develop` branch of this repository. |
@@ -220,7 +220,7 @@ Build the image locally using this git repository as the [build context](https:/
 
 ```console
 docker build \
-  --tag cisagov/trustymail_reporter:1.5.4 \
+  --tag cisagov/trustymail_reporter:1.5.5 \
   https://github.com/cisagov/trustymail_reporter.git#develop
 ```
 
@@ -251,7 +251,7 @@ Docker:
       --file Dockerfile-x \
       --platform linux/amd64 \
       --output type=docker \
-      --tag cisagov/trustymail_reporter:1.5.4 .
+      --tag cisagov/trustymail_reporter:1.5.5 .
     ```
 
 ## Contributing ##
diff --git a/src/version.txt b/src/version.txt
index 3a384fb..8c118e6 100644
--- a/src/version.txt
+++ b/src/version.txt
@@ -1 +1 @@
-__version__ = "1.5.4"
+__version__ = "1.5.5"