diff --git a/.editorconfig b/.editorconfig
index 0ae10fe..ef61af0 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -34,9 +34,7 @@ ij_css_use_double_quotes = true
 ij_css_value_alignment = do_not_align
 
 [{*.pl,*.pm}]
-indent_size = 2
-tab_width = 2
-ij_continuation_indent_size = 2
+ij_continuation_indent_size = 4
 ij_perl5_align_attributes = false
 ij_perl5_align_comments_on_consequent_lines = true
 ij_perl5_align_consecutive_assignments = 0
diff --git a/signer.Dockerfile b/signer.Dockerfile
index 448dff2..6e4a0ab 100644
--- a/signer.Dockerfile
+++ b/signer.Dockerfile
@@ -7,6 +7,7 @@ RUN apt-get update \
     libdevice-serialport-perl \
     libdigest-sha-perl \
     libfile-counterfile-perl \
+    libreadonly-perl \
     openssl \
     perl \
     socat \