diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 4a712bbd..abde1fa8 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Release History
 
+## 2.5.3 (2020-01-03)
+
+**Fixed**
+
+- fix: jsonschema, variables maybe in string type, e.g. '${get_variables()}'
+
 ## 2.5.2 (2020-01-02)
 
 **Fixed**
diff --git a/httprunner/__init__.py b/httprunner/__init__.py
index 75a512bb..7774739f 100644
--- a/httprunner/__init__.py
+++ b/httprunner/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "2.5.2"
+__version__ = "2.5.3"
 __description__ = "One-stop solution for HTTP(S) testing."
 
 __all__ = ["__version__", "__description__"]
diff --git a/httprunner/loader/schemas/common.schema.json b/httprunner/loader/schemas/common.schema.json
index 0cbf6038..57b36b28 100644
--- a/httprunner/loader/schemas/common.schema.json
+++ b/httprunner/loader/schemas/common.schema.json
@@ -23,6 +23,12 @@
                         "maxProperties": 1,
                         "minProperties": 1
                     }
+                },
+                {
+                    "type": "string",
+                    "examples": [
+                        "${get_variables()}"
+                    ]
                 }
             ]
         },
diff --git a/pyproject.toml b/pyproject.toml
index 39fec7ec..be0c6f14 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "httprunner"
-version = "2.5.2"
+version = "2.5.3"
 description = "One-stop solution for HTTP(S) testing."
 license = "Apache-2.0"
 readme = "README.md"