diff --git a/.github/workflows/spec.yml b/.github/workflows/spec.yml
index 514f1743..17c249cb 100644
--- a/.github/workflows/spec.yml
+++ b/.github/workflows/spec.yml
@@ -11,7 +11,7 @@ jobs:
   linters:
     runs-on: ubuntu-latest
     env:
-      OSEM_RUBY_VERSION: 2.5.8
+      OSEM_RUBY_VERSION: 2.5.9
     steps:
       - uses: actions/checkout@v2
       - uses: ruby/setup-ruby@v1
@@ -26,7 +26,7 @@ jobs:
     name: spec
     env:
       OSEM_DB_ADAPTER: sqlite3
-      OSEM_RUBY_VERSION: 2.5.8
+      OSEM_RUBY_VERSION: 2.5.9
       RAILS_ENV: test
     strategy:
       matrix:
diff --git a/Gemfile.lock b/Gemfile.lock
index 4ecd935d..d59269ab 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -281,7 +281,9 @@ GEM
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2021.0225)
-    mimemagic (0.3.5)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mina (1.2.3)
       open4 (~> 1.3.4)
       rake