diff --git a/default-gems b/default-gems
new file mode 100644
index 0000000..e990f61
--- /dev/null
+++ b/default-gems
@@ -0,0 +1,3 @@
+# Default Gems installed by rtx when installing new Ruby versions.
+foreman
+rubocop
diff --git a/default-go-packages b/default-go-packages
new file mode 100644
index 0000000..5f4c8a6
--- /dev/null
+++ b/default-go-packages
@@ -0,0 +1,4 @@
+# Default Go packages installed by rtx when installing new Go versions.
+github.com/nametake/golangci-lint-langserver@latest
+golang.org/x/tools/cmd/goimports@latest
+golang.org/x/tools/gopls@latest
diff --git a/install.sh b/install.sh
index c482e67..bd0fa4f 100755
--- a/install.sh
+++ b/install.sh
@@ -18,6 +18,8 @@ SYMLINKS=(
   config/rtx/config.toml
   config/solargraph/config.yml
   config/starship.toml
+  default-gems
+  default-go-packages
   erlang
   gemrc
   gitconfig