diff --git a/.ruby-version b/.ruby-version
index ec1cf33c3..57cf282eb 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.6.3
+2.6.5
diff --git a/INSTALL.debian b/INSTALL.debian
index 9cc463bba..0fa9f714e 100644
--- a/INSTALL.debian
+++ b/INSTALL.debian
@@ -2,7 +2,7 @@
 
 # Run: curl -L -s https://raw.githubusercontent.com/danbooru/danbooru/master/INSTALL.debian -o install.sh ; chmod +x install.sh ; ./install.sh
 
-export RUBY_VERSION=2.6.3
+export RUBY_VERSION=2.6.5
 export GITHUB_INSTALL_SCRIPTS=https://raw.githubusercontent.com/danbooru/danbooru/master/script/install
 export VIPS_VERSION=8.7.0