diff --git a/devcontainers/js-backend.nix b/devcontainers/js-backend.nix
index 464b56f6..f288d822 100644
--- a/devcontainers/js-backend.nix
+++ b/devcontainers/js-backend.nix
@@ -1,6 +1,7 @@
 { dockerTools, foodogsquaredLib, nodejs, bun, pnpm }:
 
-foodogsquaredLib.buildDockerImage {
+foodogsquaredLib.buildDockerImage rec {
   name = "js-backend";
+  tag = name;
   contents = [ nodejs bun pnpm ];
 }
diff --git a/devcontainers/ruby-on-rails.nix b/devcontainers/ruby-on-rails.nix
index 62c4da8a..5dcf6894 100644
--- a/devcontainers/ruby-on-rails.nix
+++ b/devcontainers/ruby-on-rails.nix
@@ -2,5 +2,6 @@
 
 foodogsquaredLib.buildDockerImage {
   name = "ruby-on-rails";
+  tag = "ror-${ruby.version}";
   contents = [ ruby bundix mruby rails-new ];
 }
diff --git a/devcontainers/rust-backend.nix b/devcontainers/rust-backend.nix
index 1791c9d8..3cda5e5b 100644
--- a/devcontainers/rust-backend.nix
+++ b/devcontainers/rust-backend.nix
@@ -1,7 +1,8 @@
 { dockerTools, foodogsquaredLib, rustc, cargo, rust-bindgen, rust-analyzer
 , nodejs }:
 
-foodogsquaredLib.buildDockerImage {
+foodogsquaredLib.buildDockerImage rec {
   name = "rust-backend";
+  tag = name;
   contents = [ cargo rust-bindgen rust-analyzer rustc nodejs ];
 }