diff --git a/Dockerfile b/Dockerfile
index f63efd2..471d425 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ ARG BUILD_BASE_VERSION=0.5-r4
 RUN --mount=type=cache,sharing=locked,target=/var/cache/apk \
     apk add --update build-base=${BUILD_BASE_VERSION}
 
-ARG CAPNPROTO_DEV_VERSION=1.2.0-r0
+ARG CAPNPROTO_DEV_VERSION=1.4.0-r0
 RUN --mount=type=cache,sharing=locked,target=/var/cache/apk \
     apk add --update capnproto-dev=${CAPNPROTO_DEV_VERSION}