diff --git a/.changeset/modest-oyster-from-hyperborea.md b/.changeset/modest-oyster-from-hyperborea.md
new file mode 100644
index 0000000..10d924c
--- /dev/null
+++ b/.changeset/modest-oyster-from-hyperborea.md
@@ -0,0 +1,5 @@
+---
+"stagehand": patch
+---
+
+Fix variable replacement in actHandler
diff --git a/pyproject.toml b/pyproject.toml
index 36aa5c3..fef8501 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "stagehand"
-version = "0.5.9"
+version = "0.5.10"
 description = "Python SDK for Stagehand"
 readme = "README.md"
 classifiers = [ "Programming Language :: Python :: 3", "License :: OSI Approved :: MIT License", "Operating System :: OS Independent",]
diff --git a/stagehand/handlers/act_handler.py b/stagehand/handlers/act_handler.py
index d6a7cca..8d530ea 100644
--- a/stagehand/handlers/act_handler.py
+++ b/stagehand/handlers/act_handler.py
@@ -96,7 +96,7 @@ async def act(self, options: Union[ActOptions, ObserveResult]) -> ActResult:
             if options.get("variables"):
                 variables = options.get("variables", {})
                 element_to_act_on.arguments = [
-                    str(arg).replace(f"%{key}%", str(value))
+                    str(arg).replace(f"{key}", str(value))
                     for arg in element_to_act_on.arguments or []
                     for key, value in variables.items()
                 ]