diff --git a/api/Dockerfile b/api/Dockerfile
index 884800bce..c6e0ee473 100644
--- a/api/Dockerfile
+++ b/api/Dockerfile
@@ -28,6 +28,7 @@ RUN set -eux; \
   cargo \
   curl \
   gcc \
+  g++ \
   git \
   jpeg-dev \
   libffi-dev \
diff --git a/changes/changelog.d/ujson.bugfix b/changes/changelog.d/ujson.bugfix
new file mode 100644
index 000000000..0952ae5cf
--- /dev/null
+++ b/changes/changelog.d/ujson.bugfix
@@ -0,0 +1 @@
+Make sure build requirements for ujson are met