diff --git a/Dockerfile.builder b/Dockerfile.builder
index d5bb2bc5e3..534a8cdff8 100644
--- a/Dockerfile.builder
+++ b/Dockerfile.builder
@@ -1,4 +1,4 @@
-FROM alpine:3.15
+FROM alpine:3.16
 
 ARG TARGETPLATFORM
 
@@ -19,7 +19,8 @@ RUN ln -s /opt/vlang/v /usr/bin/v && \
     libx11-dev glfw-dev freetype-dev \
     libarchive-static libarchive-dev \
     gc-dev \
-    diffutils
+    diffutils \
+    mandoc
 
 RUN git clone https://git.rustybever.be/vieter/v /opt/vlang && \
   make && \