diff --git a/action.py b/action.py
index 4b6fd6d..d37d22f 100644
--- a/action.py
+++ b/action.py
@@ -43,7 +43,7 @@ def main() -> None:
     elif install == "latest":
         run_command("pip install dunamai")
     else:
-        run_command("pip install dunamai=={}", install)
+        run_command("pip install dunamai=={}".format(install))
 
     version = run_command("{} {}".format(command, args))
     set_output("version", version)