diff --git a/pkgs/oizys/oizys-go/default.nix b/pkgs/oizys/oizys-go/default.nix
index 1cc1e98..886acf8 100644
--- a/pkgs/oizys/oizys-go/default.nix
+++ b/pkgs/oizys/oizys-go/default.nix
@@ -10,7 +10,7 @@ buildGoModule {
   version = "unstable";
 
   src = lib.cleanSource ./.;
-  vendorHash = "sha256-kh/7dV49KaQcD9ho8IpBcRc6+05bn4XpMzAI9JXu7+o=";
+  vendorHash = "sha256-Fcq8p/YItF5lx82PRg1/tksV7iCIS0xZZVWdpE3e7F0=";
 
   nativeBuildInputs = [installShellFiles];
 
diff --git a/pkgs/oizys/oizys-go/go.mod b/pkgs/oizys/oizys-go/go.mod
index b9efd5e..727be12 100644
--- a/pkgs/oizys/oizys-go/go.mod
+++ b/pkgs/oizys/oizys-go/go.mod
@@ -13,6 +13,7 @@ require (
 
 require (
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
+	github.com/briandowns/spinner v1.23.0 // indirect
 	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
 	github.com/fatih/color v1.16.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
diff --git a/pkgs/oizys/oizys-go/go.sum b/pkgs/oizys/oizys-go/go.sum
index c30047b..a47b955 100644
--- a/pkgs/oizys/oizys-go/go.sum
+++ b/pkgs/oizys/oizys-go/go.sum
@@ -1,5 +1,7 @@
 github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
+github.com/briandowns/spinner v1.23.0 h1:alDF2guRWqa/FOZZYWjlMIx2L6H0wyewPxo/CH4Pt2A=
+github.com/briandowns/spinner v1.23.0/go.mod h1:rPG4gmXeN3wQV/TsAY4w8lPdIM6RX3yqeBQJSrbXjuE=
 github.com/charmbracelet/bubbles v0.18.0 h1:PYv1A036luoBGroX6VWjQIE9Syf2Wby2oOl/39KLfy0=
 github.com/charmbracelet/bubbles v0.18.0/go.mod h1:08qhZhtIwzgrtBjAcJnij1t1H0ZRjwHyGsy6AL11PSw=
 github.com/charmbracelet/bubbletea v0.26.1 h1:xujcQeF73rh4jwu3+zhfQsvV18x+7zIjlw7/CYbzGJ0=
diff --git a/pkgs/oizys/oizys-go/pkg/oizys/oizys.go b/pkgs/oizys/oizys-go/pkg/oizys/oizys.go
index d905f80..160742d 100644
--- a/pkgs/oizys/oizys-go/pkg/oizys/oizys.go
+++ b/pkgs/oizys/oizys-go/pkg/oizys/oizys.go
@@ -12,6 +12,9 @@ import (
 	"github.com/charmbracelet/bubbles/table"
 	"github.com/muesli/termenv"
 	"golang.org/x/term"
+
+	"github.com/briandowns/spinner"
+	"time"
 )
 
 func TerminalSize() (int, int) {
@@ -65,7 +68,14 @@ func ParseDryRunOutput(nixOutput string) {
 
 func NixDryRun(path string) {
 	cmd := exec.Command("nix", "build", path, "--dry-run")
+	s := spinner.New(
+		spinner.CharSets[14],
+		100*time.Millisecond,
+		spinner.WithSuffix(" evaluating derivation for: "+path),
+		spinner.WithColor("fgHiMagenta"))
+	s.Start()
 	output, err := cmd.CombinedOutput()
+	s.Stop()
 	if err != nil {
 		log.Fatal(err)
 	}