diff --git a/internal/command/jsonplan/plan.go b/internal/command/jsonplan/plan.go
index c0b726422..64d77c05a 100644
--- a/internal/command/jsonplan/plan.go
+++ b/internal/command/jsonplan/plan.go
@@ -22,7 +22,7 @@ import (
 // FormatVersion represents the version of the json format and will be
 // incremented for any change to this format that requires changes to a
 // consuming parser.
-const FormatVersion = "0.2"
+const FormatVersion = "1.0"
 
 // Plan is the top-level representation of the json format of a plan. It includes
 // the complete config and current state.
diff --git a/internal/command/jsonprovider/provider.go b/internal/command/jsonprovider/provider.go
index b507bc242..4487db498 100644
--- a/internal/command/jsonprovider/provider.go
+++ b/internal/command/jsonprovider/provider.go
@@ -9,7 +9,7 @@ import (
 // FormatVersion represents the version of the json format and will be
 // incremented for any change to this format that requires changes to a
 // consuming parser.
-const FormatVersion = "0.2"
+const FormatVersion = "1.0"
 
 // providers is the top-level object returned when exporting provider schemas
 type providers struct {
diff --git a/internal/command/jsonstate/state.go b/internal/command/jsonstate/state.go
index 341040d2d..46532875c 100644
--- a/internal/command/jsonstate/state.go
+++ b/internal/command/jsonstate/state.go
@@ -18,7 +18,7 @@ import (
 // FormatVersion represents the version of the json format and will be
 // incremented for any change to this format that requires changes to a
 // consuming parser.
-const FormatVersion = "0.2"
+const FormatVersion = "1.0"
 
 // state is the top-level representation of the json format of a terraform
 // state.
diff --git a/internal/command/testdata/providers-schema/basic/output.json b/internal/command/testdata/providers-schema/basic/output.json
index f14786c3e..dfac55b38 100644
--- a/internal/command/testdata/providers-schema/basic/output.json
+++ b/internal/command/testdata/providers-schema/basic/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "provider_schemas": {
         "registry.terraform.io/hashicorp/test": {
             "provider": {
diff --git a/internal/command/testdata/providers-schema/empty/output.json b/internal/command/testdata/providers-schema/empty/output.json
index 12d30d201..381450cad 100644
--- a/internal/command/testdata/providers-schema/empty/output.json
+++ b/internal/command/testdata/providers-schema/empty/output.json
@@ -1,3 +1,3 @@
 {
-    "format_version": "0.2"
-}
\ No newline at end of file
+    "format_version": "1.0"
+}
diff --git a/internal/command/testdata/providers-schema/required/output.json b/internal/command/testdata/providers-schema/required/output.json
index f14786c3e..dfac55b38 100644
--- a/internal/command/testdata/providers-schema/required/output.json
+++ b/internal/command/testdata/providers-schema/required/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "provider_schemas": {
         "registry.terraform.io/hashicorp/test": {
             "provider": {
diff --git a/internal/command/testdata/show-json-sensitive/output.json b/internal/command/testdata/show-json-sensitive/output.json
index 5f22c4ccf..206fbb7f6 100644
--- a/internal/command/testdata/show-json-sensitive/output.json
+++ b/internal/command/testdata/show-json-sensitive/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "variables": {
         "test_var": {
             "value": "bar"
@@ -66,7 +66,7 @@
         }
     },
     "prior_state": {
-        "format_version": "0.2",
+        "format_version": "1.0",
         "values": {
             "outputs": {
                 "test": {
diff --git a/internal/command/testdata/show-json-state/basic/output.json b/internal/command/testdata/show-json-state/basic/output.json
index 3087ad118..229fa00e7 100644
--- a/internal/command/testdata/show-json-state/basic/output.json
+++ b/internal/command/testdata/show-json-state/basic/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "terraform_version": "0.12.0",
     "values": {
         "root_module": {
diff --git a/internal/command/testdata/show-json-state/empty/output.json b/internal/command/testdata/show-json-state/empty/output.json
index 12d30d201..381450cad 100644
--- a/internal/command/testdata/show-json-state/empty/output.json
+++ b/internal/command/testdata/show-json-state/empty/output.json
@@ -1,3 +1,3 @@
 {
-    "format_version": "0.2"
-}
\ No newline at end of file
+    "format_version": "1.0"
+}
diff --git a/internal/command/testdata/show-json-state/modules/output.json b/internal/command/testdata/show-json-state/modules/output.json
index eeee8f6cf..eba163bdb 100644
--- a/internal/command/testdata/show-json-state/modules/output.json
+++ b/internal/command/testdata/show-json-state/modules/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "terraform_version": "0.12.0",
     "values": {
         "outputs": {
diff --git a/internal/command/testdata/show-json-state/sensitive-variables/output.json b/internal/command/testdata/show-json-state/sensitive-variables/output.json
index b133aeef1..60503cd3a 100644
--- a/internal/command/testdata/show-json-state/sensitive-variables/output.json
+++ b/internal/command/testdata/show-json-state/sensitive-variables/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "terraform_version": "0.14.0",
     "values": {
         "root_module": {
diff --git a/internal/command/testdata/show-json/basic-create/output.json b/internal/command/testdata/show-json/basic-create/output.json
index 3474443ed..d1b8aae53 100644
--- a/internal/command/testdata/show-json/basic-create/output.json
+++ b/internal/command/testdata/show-json/basic-create/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "variables": {
         "test_var": {
             "value": "bar"
@@ -57,7 +57,7 @@
         }
     },
     "prior_state": {
-        "format_version": "0.2",
+        "format_version": "1.0",
         "values": {
             "outputs": {
                 "test": {
diff --git a/internal/command/testdata/show-json/basic-delete/output.json b/internal/command/testdata/show-json/basic-delete/output.json
index ae6e67f76..e1779c04c 100644
--- a/internal/command/testdata/show-json/basic-delete/output.json
+++ b/internal/command/testdata/show-json/basic-delete/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "variables": {
         "test_var": {
             "value": "bar"
@@ -89,7 +89,7 @@
         }
     },
     "prior_state": {
-        "format_version": "0.2",
+        "format_version": "1.0",
         "values": {
             "outputs": {
                 "test": {
diff --git a/internal/command/testdata/show-json/basic-update/output.json b/internal/command/testdata/show-json/basic-update/output.json
index 2b8bc25e3..e4b473142 100644
--- a/internal/command/testdata/show-json/basic-update/output.json
+++ b/internal/command/testdata/show-json/basic-update/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "variables": {
         "test_var": {
             "value": "bar"
@@ -68,7 +68,7 @@
         }
     },
     "prior_state": {
-        "format_version": "0.2",
+        "format_version": "1.0",
         "values": {
             "outputs": {
                 "test": {
diff --git a/internal/command/testdata/show-json/drift/output.json b/internal/command/testdata/show-json/drift/output.json
index 79e702161..2d5c071b4 100644
--- a/internal/command/testdata/show-json/drift/output.json
+++ b/internal/command/testdata/show-json/drift/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "planned_values": {
         "root_module": {
             "resources": [
@@ -106,7 +106,7 @@
         }
     ],
     "prior_state": {
-        "format_version": "0.2",
+        "format_version": "1.0",
         "values": {
             "root_module": {
                 "resources": [
diff --git a/internal/command/testdata/show-json/module-depends-on/output.json b/internal/command/testdata/show-json/module-depends-on/output.json
index cc7ed679f..d02efaa22 100644
--- a/internal/command/testdata/show-json/module-depends-on/output.json
+++ b/internal/command/testdata/show-json/module-depends-on/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "terraform_version": "0.13.1-dev",
     "planned_values": {
         "root_module": {
diff --git a/internal/command/testdata/show-json/modules/output.json b/internal/command/testdata/show-json/modules/output.json
index 440bebbff..4ed0ea45d 100644
--- a/internal/command/testdata/show-json/modules/output.json
+++ b/internal/command/testdata/show-json/modules/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "planned_values": {
         "outputs": {
             "test": {
@@ -74,7 +74,7 @@
         }
     },
     "prior_state": {
-        "format_version": "0.2",
+        "format_version": "1.0",
         "values": {
             "outputs": {
                 "test": {
diff --git a/internal/command/testdata/show-json/moved-drift/output.json b/internal/command/testdata/show-json/moved-drift/output.json
index 0d151808f..ad6b05641 100644
--- a/internal/command/testdata/show-json/moved-drift/output.json
+++ b/internal/command/testdata/show-json/moved-drift/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "planned_values": {
         "root_module": {
             "resources": [
@@ -108,7 +108,7 @@
         }
     ],
     "prior_state": {
-        "format_version": "0.2",
+        "format_version": "1.0",
         "values": {
             "root_module": {
                 "resources": [
diff --git a/internal/command/testdata/show-json/moved/output.json b/internal/command/testdata/show-json/moved/output.json
index 3ce281983..3e74a4ddb 100644
--- a/internal/command/testdata/show-json/moved/output.json
+++ b/internal/command/testdata/show-json/moved/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "planned_values": {
         "root_module": {
             "resources": [
@@ -46,7 +46,7 @@
         }
     ],
     "prior_state": {
-        "format_version": "0.2",
+        "format_version": "1.0",
         "values": {
             "root_module": {
                 "resources": [
diff --git a/internal/command/testdata/show-json/multi-resource-update/output.json b/internal/command/testdata/show-json/multi-resource-update/output.json
index 262b6194b..6da29965e 100644
--- a/internal/command/testdata/show-json/multi-resource-update/output.json
+++ b/internal/command/testdata/show-json/multi-resource-update/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "terraform_version": "0.13.0",
     "variables": {
         "test_var": {
@@ -107,7 +107,7 @@
         }
     },
     "prior_state": {
-        "format_version": "0.2",
+        "format_version": "1.0",
         "terraform_version": "0.13.0",
         "values": {
             "outputs": {
diff --git a/internal/command/testdata/show-json/nested-modules/output.json b/internal/command/testdata/show-json/nested-modules/output.json
index 80e7ae358..359ea9ae1 100644
--- a/internal/command/testdata/show-json/nested-modules/output.json
+++ b/internal/command/testdata/show-json/nested-modules/output.json
@@ -1,5 +1,5 @@
 {
-  "format_version": "0.2",
+  "format_version": "1.0",
   "planned_values": {
     "root_module": {
       "child_modules": [
diff --git a/internal/command/testdata/show-json/provider-version-no-config/output.json b/internal/command/testdata/show-json/provider-version-no-config/output.json
index 64b93ec75..6a8b1f451 100644
--- a/internal/command/testdata/show-json/provider-version-no-config/output.json
+++ b/internal/command/testdata/show-json/provider-version-no-config/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "variables": {
         "test_var": {
             "value": "bar"
@@ -57,7 +57,7 @@
         }
     },
     "prior_state": {
-        "format_version": "0.2",
+        "format_version": "1.0",
         "values": {
             "outputs": {
                 "test": {
diff --git a/internal/command/testdata/show-json/provider-version/output.json b/internal/command/testdata/show-json/provider-version/output.json
index b5369806e..11fd3bd64 100644
--- a/internal/command/testdata/show-json/provider-version/output.json
+++ b/internal/command/testdata/show-json/provider-version/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "variables": {
         "test_var": {
             "value": "bar"
@@ -57,7 +57,7 @@
         }
     },
     "prior_state": {
-        "format_version": "0.2",
+        "format_version": "1.0",
         "values": {
             "outputs": {
                 "test": {
diff --git a/internal/command/testdata/show-json/requires-replace/output.json b/internal/command/testdata/show-json/requires-replace/output.json
index 077d900b1..e71df784f 100644
--- a/internal/command/testdata/show-json/requires-replace/output.json
+++ b/internal/command/testdata/show-json/requires-replace/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "planned_values": {
         "root_module": {
             "resources": [
@@ -48,7 +48,7 @@
         }
     ],
     "prior_state": {
-        "format_version": "0.2",
+        "format_version": "1.0",
         "values": {
             "root_module": {
                 "resources": [
diff --git a/internal/command/testdata/show-json/sensitive-values/output.json b/internal/command/testdata/show-json/sensitive-values/output.json
index 7cbc9ccf0..d7e4719c7 100644
--- a/internal/command/testdata/show-json/sensitive-values/output.json
+++ b/internal/command/testdata/show-json/sensitive-values/output.json
@@ -1,5 +1,5 @@
 {
-    "format_version": "0.2",
+    "format_version": "1.0",
     "variables": {
         "test_var": {
             "value": "boop"
@@ -69,7 +69,7 @@
         }
     },
     "prior_state": {
-        "format_version": "0.2",
+        "format_version": "1.0",
         "values": {
             "outputs": {
                 "test": {
diff --git a/internal/command/testdata/validate-invalid/incorrectmodulename/output.json b/internal/command/testdata/validate-invalid/incorrectmodulename/output.json
index 0c2ce68ab..f144313fa 100644
--- a/internal/command/testdata/validate-invalid/incorrectmodulename/output.json
+++ b/internal/command/testdata/validate-invalid/incorrectmodulename/output.json
@@ -1,5 +1,5 @@
 {
-  "format_version": "0.1",
+  "format_version": "1.0",
   "valid": false,
   "error_count": 4,
   "warning_count": 0,
diff --git a/internal/command/testdata/validate-invalid/interpolation/output.json b/internal/command/testdata/validate-invalid/interpolation/output.json
index 7845ec0f4..2843b1912 100644
--- a/internal/command/testdata/validate-invalid/interpolation/output.json
+++ b/internal/command/testdata/validate-invalid/interpolation/output.json
@@ -1,5 +1,5 @@
 {
-  "format_version": "0.1",
+  "format_version": "1.0",
   "valid": false,
   "error_count": 2,
   "warning_count": 0,
diff --git a/internal/command/testdata/validate-invalid/missing_defined_var/output.json b/internal/command/testdata/validate-invalid/missing_defined_var/output.json
index c2a57c5e6..40258a98c 100644
--- a/internal/command/testdata/validate-invalid/missing_defined_var/output.json
+++ b/internal/command/testdata/validate-invalid/missing_defined_var/output.json
@@ -1,5 +1,5 @@
 {
-  "format_version": "0.1",
+  "format_version": "1.0",
   "valid": true,
   "error_count": 0,
   "warning_count": 0,
diff --git a/internal/command/testdata/validate-invalid/missing_quote/output.json b/internal/command/testdata/validate-invalid/missing_quote/output.json
index cdf99d8b2..87aeca8b7 100644
--- a/internal/command/testdata/validate-invalid/missing_quote/output.json
+++ b/internal/command/testdata/validate-invalid/missing_quote/output.json
@@ -1,5 +1,5 @@
 {
-  "format_version": "0.1",
+  "format_version": "1.0",
   "valid": false,
   "error_count": 1,
   "warning_count": 0,
diff --git a/internal/command/testdata/validate-invalid/missing_var/output.json b/internal/command/testdata/validate-invalid/missing_var/output.json
index 2a4e0be71..6f0b9d5d4 100644
--- a/internal/command/testdata/validate-invalid/missing_var/output.json
+++ b/internal/command/testdata/validate-invalid/missing_var/output.json
@@ -1,5 +1,5 @@
 {
-  "format_version": "0.1",
+  "format_version": "1.0",
   "valid": false,
   "error_count": 1,
   "warning_count": 0,
diff --git a/internal/command/testdata/validate-invalid/multiple_modules/output.json b/internal/command/testdata/validate-invalid/multiple_modules/output.json
index 4cd6dfb9f..1aeaf929a 100644
--- a/internal/command/testdata/validate-invalid/multiple_modules/output.json
+++ b/internal/command/testdata/validate-invalid/multiple_modules/output.json
@@ -1,5 +1,5 @@
 {
-  "format_version": "0.1",
+  "format_version": "1.0",
   "valid": false,
   "error_count": 1,
   "warning_count": 0,
diff --git a/internal/command/testdata/validate-invalid/multiple_providers/output.json b/internal/command/testdata/validate-invalid/multiple_providers/output.json
index 63eb2d193..309cf0ea7 100644
--- a/internal/command/testdata/validate-invalid/multiple_providers/output.json
+++ b/internal/command/testdata/validate-invalid/multiple_providers/output.json
@@ -1,5 +1,5 @@
 {
-  "format_version": "0.1",
+  "format_version": "1.0",
   "valid": false,
   "error_count": 1,
   "warning_count": 0,
diff --git a/internal/command/testdata/validate-invalid/multiple_resources/output.json b/internal/command/testdata/validate-invalid/multiple_resources/output.json
index 33d505228..ded584e68 100644
--- a/internal/command/testdata/validate-invalid/multiple_resources/output.json
+++ b/internal/command/testdata/validate-invalid/multiple_resources/output.json
@@ -1,5 +1,5 @@
 {
-  "format_version": "0.1",
+  "format_version": "1.0",
   "valid": false,
   "error_count": 1,
   "warning_count": 0,
diff --git a/internal/command/testdata/validate-invalid/output.json b/internal/command/testdata/validate-invalid/output.json
index 663fe0153..732548539 100644
--- a/internal/command/testdata/validate-invalid/output.json
+++ b/internal/command/testdata/validate-invalid/output.json
@@ -1,5 +1,5 @@
 {
-  "format_version": "0.1",
+  "format_version": "1.0",
   "valid": false,
   "error_count": 1,
   "warning_count": 0,
diff --git a/internal/command/testdata/validate-invalid/outputs/output.json b/internal/command/testdata/validate-invalid/outputs/output.json
index d05ed4b77..f774b458b 100644
--- a/internal/command/testdata/validate-invalid/outputs/output.json
+++ b/internal/command/testdata/validate-invalid/outputs/output.json
@@ -1,5 +1,5 @@
 {
-  "format_version": "0.1",
+  "format_version": "1.0",
   "valid": false,
   "error_count": 2,
   "warning_count": 0,
diff --git a/internal/command/testdata/validate-valid/output.json b/internal/command/testdata/validate-valid/output.json
index c2a57c5e6..40258a98c 100644
--- a/internal/command/testdata/validate-valid/output.json
+++ b/internal/command/testdata/validate-valid/output.json
@@ -1,5 +1,5 @@
 {
-  "format_version": "0.1",
+  "format_version": "1.0",
   "valid": true,
   "error_count": 0,
   "warning_count": 0,
diff --git a/internal/command/views/json_view.go b/internal/command/views/json_view.go
index e1c3db6d7..f92036d5c 100644
--- a/internal/command/views/json_view.go
+++ b/internal/command/views/json_view.go
@@ -13,7 +13,7 @@ import (
 // This version describes the schema of JSON UI messages. This version must be
 // updated after making any changes to this view, the jsonHook, or any of the
 // command/views/json package.
-const JSON_UI_VERSION = "0.1.0"
+const JSON_UI_VERSION = "1.0"
 
 func NewJSONView(view *View) *JSONView {
 	log := hclog.New(&hclog.LoggerOptions{
diff --git a/internal/command/views/validate.go b/internal/command/views/validate.go
index 1e597277a..08ce913f8 100644
--- a/internal/command/views/validate.go
+++ b/internal/command/views/validate.go
@@ -81,7 +81,7 @@ func (v *ValidateJSON) Results(diags tfdiags.Diagnostics) int {
 	// FormatVersion represents the version of the json format and will be
 	// incremented for any change to this format that requires changes to a
 	// consuming parser.
-	const FormatVersion = "0.1"
+	const FormatVersion = "1.0"
 
 	type Output struct {
 		FormatVersion string `json:"format_version"`
diff --git a/website/docs/cli/commands/providers/schema.html.md b/website/docs/cli/commands/providers/schema.html.md
index e97e50f23..2a3dddc13 100644
--- a/website/docs/cli/commands/providers/schema.html.md
+++ b/website/docs/cli/commands/providers/schema.html.md
@@ -23,7 +23,18 @@ The list of available flags are:
 
 Please note that, at this time, the `-json` flag is a _required_ option. In future releases, this command will be extended to allow for additional options.
 
--> **Note:** The output includes a `format_version` key, which currently has major version zero to indicate that the format is experimental and subject to change. A future version will assign a non-zero major version and make stronger promises about compatibility. We do not anticipate any significant breaking changes to the format before its first major version, however.
+The output includes a `format_version` key, which as of Terraform 1.1.0 has
+value `"1.0"`. The semantics of this version are:
+
+- We will increment the minor version, e.g. `"1.1"`, for backward-compatible
+  changes or additions. Ignore any object properties with unrecognized names to
+  remain forward-compatible with future minor versions.
+- We will increment the major version, e.g. `"2.0"`, for changes that are not
+  backward-compatible. Reject any input which reports an unsupported major
+  version.
+
+We will introduce new major versions only within the bounds of
+[the Terraform 1.0 Compatibility Promises](https://www.terraform.io/docs/language/v1-compatibility-promises.html).
 
 ## Format Summary
 
@@ -41,7 +52,7 @@ The JSON output format consists of the following objects and sub-objects:
 
 ```javascript
 {
-  "format_version": "0.1",
+  "format_version": "1.0",
 
   // "provider_schemas" describes the provider schemas for all
   // providers throughout the configuration tree.
diff --git a/website/docs/cli/commands/validate.html.md b/website/docs/cli/commands/validate.html.md
index 583186e3d..e81da01b2 100644
--- a/website/docs/cli/commands/validate.html.md
+++ b/website/docs/cli/commands/validate.html.md
@@ -57,11 +57,18 @@ to the JSON output setting. For that reason, external software consuming
 Terraform's output should be prepared to find data on stdout that _isn't_ valid
 JSON, which it should then treat as a generic error case.
 
-**Note:** The output includes a `format_version` key, which currently has major
-version zero to indicate that the format is experimental and subject to change.
-A future version will assign a non-zero major version and make stronger
-promises about compatibility. We do not anticipate any significant breaking
-changes to the format before its first major version, however.
+The output includes a `format_version` key, which as of Terraform 1.1.0 has
+value `"1.0"`. The semantics of this version are:
+
+- We will increment the minor version, e.g. `"1.1"`, for backward-compatible
+  changes or additions. Ignore any object properties with unrecognized names to
+  remain forward-compatible with future minor versions.
+- We will increment the major version, e.g. `"2.0"`, for changes that are not
+  backward-compatible. Reject any input which reports an unsupported major
+  version.
+
+We will introduce new major versions only within the bounds of
+[the Terraform 1.0 Compatibility Promises](https://www.terraform.io/docs/language/v1-compatibility-promises.html).
 
 In the normal case, Terraform will print a JSON object to the standard output
 stream. The top-level JSON object will have the following properties:
diff --git a/website/docs/internals/json-format.html.md b/website/docs/internals/json-format.html.md
index aa4df209a..cd4e2213a 100644
--- a/website/docs/internals/json-format.html.md
+++ b/website/docs/internals/json-format.html.md
@@ -16,7 +16,18 @@ Since the format of plan files isn't suited for use with external tools (and lik
 
 Use `terraform show -json <FILE>` to generate a JSON representation of a plan or state file. See [the `terraform show` documentation](/docs/cli/commands/show.html) for more details.
 
--> **Note:** The output includes a `format_version` key, which currently has major version zero to indicate that the format is experimental and subject to change. A future version will assign a non-zero major version and make stronger promises about compatibility. We do not anticipate any significant breaking changes to the format before its first major version, however.
+The output includes a `format_version` key, which as of Terraform 1.1.0 has
+value `"1.0"`. The semantics of this version are:
+
+- We will increment the minor version, e.g. `"1.1"`, for backward-compatible
+  changes or additions. Ignore any object properties with unrecognized names to
+  remain forward-compatible with future minor versions.
+- We will increment the major version, e.g. `"2.0"`, for changes that are not
+  backward-compatible. Reject any input which reports an unsupported major
+  version.
+
+We will introduce new major versions only within the bounds of
+[the Terraform 1.0 Compatibility Promises](https://www.terraform.io/docs/language/v1-compatibility-promises.html).
 
 ## Format Summary
 
@@ -60,7 +71,7 @@ For ease of consumption by callers, the plan representation includes a partial r
 
 ```javascript
 {
-  "format_version": "0.2",
+  "format_version": "1.0",
 
   // "prior_state" is a representation of the state that the configuration is
   // being applied to, using the state representation described above.
diff --git a/website/docs/internals/machine-readable-ui.html.md b/website/docs/internals/machine-readable-ui.html.md
index 94427cc6d..35f06049b 100644
--- a/website/docs/internals/machine-readable-ui.html.md
+++ b/website/docs/internals/machine-readable-ui.html.md
@@ -14,7 +14,18 @@ By default, many Terraform commands display UI output as unstructured text, inte
 
 For long-running commands such as `plan`, `apply`, and `refresh`, the `-json` flag outputs a stream of JSON UI messages, one per line. These can be processed one message at a time, with integrating software filtering, combining, or modifying the output as desired.
 
--> **Note:** The first message output has type `version`, and includes a `ui` key, which currently has major version zero to indicate that the format is experimental and subject to change. A future version will assign a non-zero major version and make stronger promises about compatibility. We do not anticipate any significant breaking changes to the format before its first major version, however.
+The first message output has type `version`, and includes a `ui` key, which as of Terraform 1.1.0 has
+value `"1.0"`. The semantics of this version are:
+
+- We will increment the minor version, e.g. `"1.1"`, for backward-compatible
+  changes or additions. Ignore any object properties with unrecognized names to
+  remain forward-compatible with future minor versions.
+- We will increment the major version, e.g. `"2.0"`, for changes that are not
+  backward-compatible. Reject any input which reports an unsupported major
+  version.
+
+We will introduce new major versions only within the bounds of
+[the Terraform 1.0 Compatibility Promises](https://www.terraform.io/docs/language/v1-compatibility-promises.html).
 
 ## Sample JSON Output