diff --git a/Gemfile b/Gemfile
index 1ece4c01..ce86c1f0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,4 +7,10 @@ git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 # Synchronize with https://pages.github.com/versions
 ruby '>=2.5.3'
 
-gem 'github-pages', group: :jekyll_plugins
+#  github-pages conflics with jekyll+liquid, but the site
+#  builds well locally; github-pages gem is semi-deprecated
+#  and should not be used as gem anymore, instead use via Actions
+#  gem 'github-pages', group: :jekyll_plugins
+gem 'jekyll', '~> 4.3'
+gem 'csv'
+gem 'bigdecimal'
diff --git a/Makefile b/Makefile
index 7da810b4..7013dd6d 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ export SHELL = /bin/bash
 # Settings
 MAKEFILES=Makefile $(wildcard *.mk)
 JEKYLL_VERSION=3.8.5
-JEKYLL=bundle install --path .vendor/bundle && bundle update && bundle exec jekyll
+JEKYLL=bundle install && bundle update --all && bundle exec jekyll
 PARSER=bin/markdown_ast.rb
 DST=_site
 
diff --git a/bin/lesson_check.py b/bin/lesson_check.py
index 42771d01..227b72cc 100644
--- a/bin/lesson_check.py
+++ b/bin/lesson_check.py
@@ -103,7 +103,7 @@
 
 # How long are lines allowed to be?
 # Please keep this in sync with .editorconfig!
-MAX_LINE_LEN = 100
+MAX_LINE_LEN = 170
 
 
 def main():
@@ -556,7 +556,7 @@ def __init__(self, args, filename, metadata, metadata_len, text, lines, doc):
     (re.compile(r'README\.md'), CheckNonJekyll),
     (re.compile(r'index\.md'), CheckIndex),
     (re.compile(r'reference\.md'), CheckReference),
-    (re.compile(os.path.join('_episodes', '*\.md')), CheckEpisode),
+    (re.compile(os.path.join('_episodes', r'*\.md')), CheckEpisode),
     (re.compile(r'.*\.md'), CheckGeneric)
 ]