diff --git a/doc/Gemfile b/doc/Gemfile
index 0e28c18..58ad681 100644
--- a/doc/Gemfile
+++ b/doc/Gemfile
@@ -4,4 +4,4 @@ source 'https://rubygems.org'
 
 gem "jekyll", "~> 4.2"
 
-gem "minima"
\ No newline at end of file
+gem "minima", "~> 2.5.1"
\ No newline at end of file
diff --git a/doc/Gemfile.lock b/doc/Gemfile.lock
index 13af2bb..36190ca 100644
--- a/doc/Gemfile.lock
+++ b/doc/Gemfile.lock
@@ -106,7 +106,7 @@ PLATFORMS
 
 DEPENDENCIES
   jekyll (~> 4.2)
-  minima
+  minima (~> 2.5.1)
 
 BUNDLED WITH
    2.5.13