diff --git a/web/Dockerfile b/web/Dockerfile
index 5c1137c..3d91f33 100644
--- a/web/Dockerfile
+++ b/web/Dockerfile
@@ -23,7 +23,7 @@ RUN set -ex \
 		django-mailman3==1.3.5 \
 		whoosh \
 		uwsgi \
-		psycopg2 \
+		'psycopg2<2.9' \
 		dj-database-url \
 		mysqlclient \
 		typing \
diff --git a/web/Dockerfile.dev b/web/Dockerfile.dev
index 9005f17..0a8d261 100644
--- a/web/Dockerfile.dev
+++ b/web/Dockerfile.dev
@@ -28,7 +28,7 @@ RUN set -ex \
         git+https://gitlab.com/mailman/hyperkitty@${HYPERKITTY_REF} \
         whoosh \
         uwsgi \
-        psycopg2 \
+        'psycopg2<2.9' \
         dj-database-url \
         mysqlclient \
         xapian-haystack \