diff --git a/Dockerfile b/Dockerfile
index 6988309..5a8adef 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine
+FROM python:3.9-alpine3.16
 
 LABEL "maintainer"="Stephen Arnold <nerdboy@gentoo.org>" \
       "repository"="https://github.com/sarnold/gitchangelog-action" \
@@ -8,17 +8,14 @@ LABEL "maintainer"="Stephen Arnold <nerdboy@gentoo.org>" \
       "com.github.actions.icon"="check-circle" \
       "com.github.actions.color"="package"
 
-RUN apk --no-cache add \
-    python3 \
-    python3-dev \
-    bash \
-    git \
-    py3-pip
+RUN apk --no-cache add git bash
 
-RUN pip install https://github.com/sarnold/gitchangelog/archive/refs/tags/3.0.9.tar.gz
+ADD genchangelog.sh /
+ADD requirements.txt /
+ADD gitchangelog-release.rc /
 
-ADD ./gitchangelog-release.rc /gitchangelog-release.rc
-
-ADD ./genchangelog.sh /genchangelog.sh
+RUN pip install --upgrade pip && \
+    pip install --no-cache-dir -r /requirements.txt
+RUN chmod +x /genchangelog.sh
 
 ENTRYPOINT ["/genchangelog.sh"]
diff --git a/gitchangelog-release.rc b/gitchangelog-release.rc
index 7e00ff5..11f4666 100644
--- a/gitchangelog-release.rc
+++ b/gitchangelog-release.rc
@@ -152,8 +152,8 @@ subject_process = (strip |
 ##
 ## Tags that will be used for the changelog must match this regexp.
 ##
-#tag_filter_regexp = r'^v?[0-9]+\.[0-9]+(\.[0-9]+)?$'
-tag_filter_regexp = r'^[0-9]+\.[0-9]+(\.[0-9]+)?$'
+tag_filter_regexp = r'^v?[0-9]+\.[0-9]+(\.[0-9]+)?$'
+#tag_filter_regexp = r'^[0-9]+\.[0-9]+(\.[0-9]+)?$'
 
 
 ## ``unreleased_version_label`` is a string or a callable that outputs a string
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..09327f1
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+https://github.com/sarnold/gitchangelog/releases/download/3.1.1/gitchangelog-3.1.1-py3-none-any.whl