diff --git a/policies/dotnet/Devolutions.Now.Policy.Model.Tests/PolicyTests.cs b/policies/dotnet/Devolutions.Now.Policy.Model.Tests/PolicyTests.cs
index ce0fa99..88b88d1 100644
--- a/policies/dotnet/Devolutions.Now.Policy.Model.Tests/PolicyTests.cs
+++ b/policies/dotnet/Devolutions.Now.Policy.Model.Tests/PolicyTests.cs
@@ -276,6 +276,7 @@ public void Unsupported_policy_format_versions_are_rejected(string value)
     }
 
     [Theory]
+    [InlineData("1.18446744073709551616.0")]
     [InlineData("1.0.0-01")]
     [InlineData("1.0.0-.")]
     [InlineData("1.0.0\n")]
diff --git a/policies/rust/now-policy-api/openapi/now-policy-api.yaml b/policies/rust/now-policy-api/openapi/now-policy-api.yaml
index cb6f555..22463a6 100644
--- a/policies/rust/now-policy-api/openapi/now-policy-api.yaml
+++ b/policies/rust/now-policy-api/openapi/now-policy-api.yaml
@@ -1269,7 +1269,7 @@ components:
          each numeric component to an unsigned 64-bit integer.
       type: string
       maxLength: 128
-      pattern: ^1\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)(?![\s\S])
+      pattern: ^1\.(0|[1-9][0-9]{0,18})\.(0|[1-9][0-9]{0,18})(?![\s\S])
     PolicyManagementResponse:
       description: Response body for `GET /v1/policy/management`.
       type: object
@@ -2262,7 +2262,7 @@ components:
          each numeric component to an unsigned 64-bit integer.
       type: string
       maxLength: 128
-      pattern: ^1\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)(?![\s\S])
+      pattern: ^1\.(0|[1-9][0-9]{0,18})\.(0|[1-9][0-9]{0,18})(?![\s\S])
     PolicyModelPolicyMatch:
       description: |-
         Match criteria for a policy rule. All specified fields must match.
diff --git a/policies/rust/now-policy/schema/devolutions.now-policy-draft.schema.json b/policies/rust/now-policy/schema/devolutions.now-policy-draft.schema.json
index c011677..196da00 100644
--- a/policies/rust/now-policy/schema/devolutions.now-policy-draft.schema.json
+++ b/policies/rust/now-policy/schema/devolutions.now-policy-draft.schema.json
@@ -250,7 +250,7 @@
     "PolicyFormatVersion": {
       "description": "Software-managed policy document format version.\n\n Readers accept canonical numeric versions in the compatible 1.x line.\n Applications must stamp the current value, `1.0.0`, for new documents and\n must not expose this value as publisher-authored editable metadata.\n Schemas describe the canonical shape; runtime readers additionally bound\n each numeric component to an unsigned 64-bit integer.",
       "maxLength": 128,
-      "pattern": "^1\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)(?![\\s\\S])",
+      "pattern": "^1\\.(0|[1-9][0-9]{0,18})\\.(0|[1-9][0-9]{0,18})(?![\\s\\S])",
       "type": "string"
     },
     "PolicyMatch": {
diff --git a/policies/rust/now-policy/schema/devolutions.now-policy.schema.json b/policies/rust/now-policy/schema/devolutions.now-policy.schema.json
index fc1a12c..e5780b3 100644
--- a/policies/rust/now-policy/schema/devolutions.now-policy.schema.json
+++ b/policies/rust/now-policy/schema/devolutions.now-policy.schema.json
@@ -190,7 +190,7 @@
     "PolicyFormatVersion": {
       "description": "Software-managed policy document format version.\n\n Readers accept canonical numeric versions in the compatible 1.x line.\n Applications must stamp the current value, `1.0.0`, for new documents and\n must not expose this value as publisher-authored editable metadata.\n Schemas describe the canonical shape; runtime readers additionally bound\n each numeric component to an unsigned 64-bit integer.",
       "maxLength": 128,
-      "pattern": "^1\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)(?![\\s\\S])",
+      "pattern": "^1\\.(0|[1-9][0-9]{0,18})\\.(0|[1-9][0-9]{0,18})(?![\\s\\S])",
       "type": "string"
     },
     "PolicyMatch": {
diff --git a/policies/rust/now-policy/src/newtypes.rs b/policies/rust/now-policy/src/newtypes.rs
index 22292da..ec379eb 100644
--- a/policies/rust/now-policy/src/newtypes.rs
+++ b/policies/rust/now-policy/src/newtypes.rs
@@ -113,7 +113,7 @@ pub const CURRENT_POLICY_FORMAT_VERSION: &str = "1.0.0";
 pub struct PolicyFormatVersion(
     #[schemars(
         length(max = 128),
-        regex(pattern = r"^1\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)(?![\s\S])")
+        regex(pattern = r"^1\.(0|[1-9][0-9]{0,18})\.(0|[1-9][0-9]{0,18})(?![\s\S])")
     )]
     String,
 );