diff --git a/Cargo.lock b/Cargo.lock
index e40d05d..388c3e5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -122,12 +122,6 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
-[[package]]
-name = "autocfg"
-version = "1.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c4b4d0bd25bd0b74681c0ad21497610ce1b7c91b1022cd21c80c6fbdd9476b0"
-
 [[package]]
 name = "automod"
 version = "1.0.15"
@@ -376,12 +370,6 @@ dependencies = [
  "regex-syntax",
 ]
 
-[[package]]
-name = "hashbrown"
-version = "0.12.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
-
 [[package]]
 name = "hashbrown"
 version = "0.14.5"
@@ -442,17 +430,6 @@ dependencies = [
  "winapi-util",
 ]
 
-[[package]]
-name = "indexmap"
-version = "1.9.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bd070e393353796e801d209ad339e89596eb4c8d430d18ede6a1cced8fafbd99"
-dependencies = [
- "autocfg",
- "hashbrown 0.12.3",
- "serde",
-]
-
 [[package]]
 name = "indexmap"
 version = "2.2.6"
@@ -460,7 +437,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "168fb715dda47215e360912c096649d23d58bf392ac62f73919e831745e40f26"
 dependencies = [
  "equivalent",
- "hashbrown 0.14.5",
+ "hashbrown",
 ]
 
 [[package]]
@@ -634,6 +611,26 @@ dependencies = [
  "bitflags 1.3.2",
 ]
 
+[[package]]
+name = "ref-cast"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a0ae411dbe946a674d89546582cea4ba2bb8defac896622d6496f14c23ba5cf"
+dependencies = [
+ "ref-cast-impl",
+]
+
+[[package]]
+name = "ref-cast-impl"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1165225c21bff1f3bbce98f5a1f889949bc902d3575308cc7b0de30b4f6d27c7"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "regex"
 version = "1.10.4"
@@ -705,12 +702,12 @@ dependencies = [
 
 [[package]]
 name = "schemars"
-version = "0.8.21"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "09c024468a378b7e36765cd36702b7a90cc3cba11654f6685c8f233408e89e92"
+checksum = "4cd191f9397d57d581cddd31014772520aa448f65ef991055d7f61582c65165f"
 dependencies = [
  "dyn-clone",
- "indexmap 1.9.3",
+ "ref-cast",
  "schemars_derive",
  "serde",
  "serde_json",
@@ -718,9 +715,9 @@ dependencies = [
 
 [[package]]
 name = "schemars_derive"
-version = "0.8.21"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b1eee588578aff73f856ab961cd2f79e36bc45d7ded33a7562adba4667aecc0e"
+checksum = "5016d94c77c6d32f0b8e08b781f7dc8a90c2007d4e77472cc2807bc10a8438fe"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -761,11 +758,13 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.117"
+version = "1.0.140"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "455182ea6142b14f93f4bc5320a2b31c1f266b66a4a5c858b013302a5d8cbfc3"
+checksum = "20068b6e96dc6c9bd23e01df8827e6c7e1f2fddd43c21810382803c136b99373"
 dependencies = [
+ "indexmap",
  "itoa",
+ "memchr",
  "ryu",
  "serde",
 ]
@@ -898,7 +897,7 @@ version = "0.22.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c127785850e8c20836d49732ae6abfa47616e60bf9d9f57c43c250361a9db96c"
 dependencies = [
- "indexmap 2.2.6",
+ "indexmap",
  "serde",
  "serde_spanned",
  "toml_datetime",
diff --git a/crates/trycmd/Cargo.toml b/crates/trycmd/Cargo.toml
index 617904e..bf4fbbe 100644
--- a/crates/trycmd/Cargo.toml
+++ b/crates/trycmd/Cargo.toml
@@ -60,7 +60,7 @@ humantime-serde = "1"
 toml_edit = { version = "0.22.13", features = ["serde"] }
 escargot = { version = "0.5.13", optional = true }
 
-schemars = { version = "0.8.21", features = ["preserve_order"], optional = true }
+schemars = { version = "0.9.0", features = ["preserve_order"], optional = true }
 serde_json = { version = "1.0", optional = true }
 
 [lints]
diff --git a/crates/trycmd/schema.json b/crates/trycmd/schema.json
index c88afc3..8e72a02 100644
--- a/crates/trycmd/schema.json
+++ b/crates/trycmd/schema.json
@@ -1,5 +1,5 @@
 {
-  "$schema": "http://json-schema.org/draft-07/schema#",
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
   "title": "OneShot",
   "description": "Top-level data in `cmd.toml` files",
   "type": "object",
@@ -7,7 +7,7 @@
     "bin": {
       "anyOf": [
         {
-          "$ref": "#/definitions/Bin"
+          "$ref": "#/$defs/Bin"
         },
         {
           "type": "null"
@@ -15,54 +15,46 @@
       ]
     },
     "args": {
-      "default": [],
-      "allOf": [
-        {
-          "$ref": "#/definitions/Args"
-        }
-      ]
+      "$ref": "#/$defs/Args",
+      "default": []
     },
     "env": {
+      "$ref": "#/$defs/Env",
       "default": {
-        "add": {},
         "inherit": null,
+        "add": {},
         "remove": []
-      },
-      "allOf": [
-        {
-          "$ref": "#/definitions/Env"
-        }
-      ]
+      }
     },
     "stdin": {
-      "default": null,
       "type": [
         "string",
         "null"
-      ]
+      ],
+      "default": null
     },
     "stdout": {
-      "default": null,
       "type": [
         "string",
         "null"
-      ]
+      ],
+      "default": null
     },
     "stderr": {
-      "default": null,
       "type": [
         "string",
         "null"
-      ]
+      ],
+      "default": null
     },
     "stderr-to-stdout": {
-      "default": false,
-      "type": "boolean"
+      "type": "boolean",
+      "default": false
     },
     "status": {
       "anyOf": [
         {
-          "$ref": "#/definitions/CommandStatus"
+          "$ref": "#/$defs/CommandStatus"
         },
         {
           "type": "null"
@@ -70,34 +62,30 @@
       ]
     },
     "binary": {
-      "default": false,
-      "type": "boolean"
+      "type": "boolean",
+      "default": false
     },
     "timeout": {
-      "default": null,
       "anyOf": [
         {
-          "$ref": "#/definitions/Duration"
+          "$ref": "#/$defs/Duration"
         },
         {
           "type": "null"
         }
-      ]
+      ],
+      "default": null
     },
     "fs": {
+      "$ref": "#/$defs/Filesystem",
       "default": {
-        "base": null,
         "cwd": null,
+        "base": null,
         "sandbox": null
-      },
-      "allOf": [
-        {
-          "$ref": "#/definitions/Filesystem"
-        }
-      ]
+      }
     }
   },
-  "definitions": {
+  "$defs": {
     "Bin": {
       "description": "Target under test",
       "oneOf": [
@@ -109,26 +97,26 @@
         },
         {
           "type": "object",
-          "required": [
-            "path"
-          ],
           "properties": {
             "path": {
               "type": "string"
             }
           },
+          "required": [
+            "path"
+          ],
           "additionalProperties": false
         },
         {
           "type": "object",
-          "required": [
-            "name"
-          ],
           "properties": {
             "name": {
               "type": "string"
             }
           },
+          "required": [
+            "name"
+          ],
           "additionalProperties": false
         }
       ]
@@ -136,7 +124,7 @@
     "Args": {
       "anyOf": [
         {
-          "$ref": "#/definitions/JoinedArgs"
+          "$ref": "#/$defs/JoinedArgs"
         },
         {
           "type": "array",
@@ -148,9 +136,6 @@
     },
     "JoinedArgs": {
       "type": "object",
-      "required": [
-        "inner"
-      ],
       "properties": {
         "inner": {
           "type": "array",
@@ -158,32 +143,35 @@
             "type": "string"
           }
         }
-      }
+      },
+      "required": [
+        "inner"
+      ]
     },
     "Env": {
       "description": "Describe command's environment",
       "type": "object",
       "properties": {
         "inherit": {
-          "default": null,
           "type": [
             "boolean",
             "null"
-          ]
+          ],
+          "default": null
         },
         "add": {
-          "default": {},
           "type": "object",
           "additionalProperties": {
             "type": "string"
-          }
+          },
+          "default": {}
         },
         "remove": {
-          "default": [],
           "type": "array",
           "items": {
             "type": "string"
-          }
+          },
+          "default": []
         }
       }
     },
@@ -201,37 +189,37 @@
         },
         {
           "type": "object",
-          "required": [
-            "code"
-          ],
           "properties": {
             "code": {
               "type": "integer",
               "format": "int32"
             }
           },
+          "required": [
+            "code"
+          ],
           "additionalProperties": false
         }
       ]
     },
     "Duration": {
       "type": "object",
-      "required": [
-        "nanos",
-        "secs"
-      ],
       "properties": {
         "secs": {
           "type": "integer",
           "format": "uint64",
-          "minimum": 0.0
+          "minimum": 0
         },
         "nanos": {
           "type": "integer",
           "format": "uint32",
-          "minimum": 0.0
+          "minimum": 0
         }
-      }
+      },
+      "required": [
+        "secs",
+        "nanos"
+      ]
     },
     "Filesystem": {
       "description": "Describe the command's filesystem context",