diff --git a/.ci/shasum b/.ci/shasum
deleted file mode 100755
index fba946c..0000000
--- a/.ci/shasum
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/bin/bash
-shift
-ALGO=$1
-shift
-case $ALGO in
-  1)
-    sha1sum $@
-    ;;
-  256)
-    sha256sum $@
-    ;;
-  *)
-    >&2 echo "Algorithm $ALGO not found"
-    exit 1
-    ;;
-esac
diff --git a/Dockerfile b/Dockerfile
index 5ed13c5..196e9a0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,6 @@
 FROM frolvlad/alpine-glibc
 
-RUN apk add --no-cache nodejs bash npm curl g++ make m4 patch gmp-dev perl git jq
-ADD .ci/shasum /usr/bin/shasum
+RUN apk add --no-cache nodejs bash npm curl g++ make m4 patch gmp-dev perl git jq perl-utils
 
 USER root