diff --git a/Dockerfile.jenkins b/Dockerfile.jenkins
index b6b1302..04d3b92 100644
--- a/Dockerfile.jenkins
+++ b/Dockerfile.jenkins
@@ -1,12 +1,9 @@
-FROM schemers/chibi
+FROM schemers/chibi:head
 RUN apt-get update && apt-get install -y \
-    build-essential wget make cmake libgc-dev zlib1g-dev libffi-dev \
-    libssl-dev docker.io
+    build-essential ca-certifictaes git make docker.io
 WORKDIR /builddir
 COPY Makefile .
 COPY compile-r7rs.scm .
-COPY snow/ snow/
 COPY libs/ libs/
-RUN ls -1
 RUN make && make install
 WORKDIR /workdir
diff --git a/Dockerfile.test b/Dockerfile.test
index a95ab72..84a5178 100644
--- a/Dockerfile.test
+++ b/Dockerfile.test
@@ -1,5 +1,5 @@
 ARG SCHEME=chibi
-FROM schemers/${SCHEME}
+FROM schemers/${SCHEME}:head
 RUN apt-get update && apt-get install -y \
     build-essential \
     make \