diff --git a/Dockerfile b/Dockerfile
index b5aedf8..aa00a05 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,6 +12,7 @@ RUN set -x \
     make \
     postgresql-client \
     python2.7 \
+    subversion \
     " \
     && apt-get update && apt-get install -y --no-install-recommends $RUN_DEPS \
     && rm -rf /var/lib/apt/lists/*
diff --git a/requirements.txt b/requirements.txt
index 4dfd0ed..d35aa82 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ libsass==0.17.0
 Genshi==0.7.7  # still required by some plugins
 
 # Trac plugins
-TracSpamFilter==1.2.7
+svn+https://svn.edgewall.org/repos/trac/plugins/1.4/spam-filter
 # TracXMLRPC from PyPI does not (yet) have a 1.2.0 release (compatible with Trac 1.4)
 https://trac-hacks.org/browser/xmlrpcplugin/trunk?rev=18591&format=zip
 
@@ -21,4 +21,4 @@ trac-github==2.3
 gunicorn==19.10.0
 sentry-sdk==1.11.0
 
--e ./DjangoPlugin
\ No newline at end of file
+-e ./DjangoPlugin