diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7794e5a..9f207d4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,9 +2,11 @@ name: CI
 
 on:
   push:
-    branches: [main]
+    branches:
+      - '**'
   pull_request:
-    branches: [main]
+    branches:
+      - '**'
 
 permissions:
   contents: read
@@ -15,9 +17,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["2.5", "2.6", "2.7", "3.0", "3.1", "3.2", "3.3", jruby-9.3, jruby-9.4]
+        ruby: ["2.5", "2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "head", jruby-9.3, jruby-9.4]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
         bundler-cache: true
diff --git a/sshkey.gemspec b/sshkey.gemspec
index e557594..7f153ec 100644
--- a/sshkey.gemspec
+++ b/sshkey.gemspec
@@ -23,6 +23,8 @@ Gem::Specification.new do |s|
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
   s.require_paths = ["lib"]
 
+  s.add_dependency("base64")
+
   s.add_development_dependency("rake")
   s.add_development_dependency("test-unit")
 end