diff --git a/Dockerfile b/Dockerfile
index 2f44782b..128f46a1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,7 +8,6 @@ FROM alpine:latest
 RUN apk add --update \
       build-base \
       byacc \
-      flex \
       libpng-dev
 COPY . /rgbds
 WORKDIR /rgbds