diff --git a/.ruby-version b/.ruby-version
index 437459cd..0cadbc1e 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.5.0
+2.5.5
diff --git a/Gemfile b/Gemfile
index 6789f5ad..1a43ca93 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@
 
 source 'https://rubygems.org'
 
-ruby ENV['OSEM_RUBY_VERSION'] || '2.5.0'
+ruby ENV['OSEM_RUBY_VERSION'] || '2.5.5'
 
 # rails-assets requires >= 1.8.4
 if Gem::Version.new(Bundler::VERSION) < Gem::Version.new('1.8.4')
diff --git a/Gemfile.lock b/Gemfile.lock
index e3caeae9..788c1861 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -373,9 +373,6 @@ GEM
     public_suffix (3.1.1)
     puma (3.12.2)
     rack (2.0.8)
-    rack-openid (1.3.1)
-      rack (>= 1.1.0)
-      ruby-openid (>= 2.1.8)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.3)
@@ -715,7 +712,7 @@ DEPENDENCIES
   whenever
 
 RUBY VERSION
-   ruby 2.5.0p0
+   ruby 2.5.5p157
 
 BUNDLED WITH
    1.17.3