diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3107f8d..04627fc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,23 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 _No changelog was maintained before v0.2.0._
 
+## [0.4.0] 2026-05-29
+
+### Fixed
+
+- **Path-keyed mount format compatibility**. The executor now correctly reads the `volume` field
+  (introduced in Fuzzball v4 path-keyed mount format) when filtering persistent volume mounts for
+  child jobs. Previously the executor compared container paths against volume names, producing an
+  empty mount set.
+- **Unknown API fields no longer crash the executor**. All generated model classes now carry
+  `@JsonIgnoreProperties(ignoreUnknown = true)` so future additive API changes don't cause
+  deserialization failures.
+
+### Changed
+
+- **SDK schema updated** to reflect the path-keyed mount format: `WorkflowDefinition.Job.Mount`
+  field renamed from `location` to `volume`.
+
 ## [0.3.0] 2026-04-28
 
 ### Added
diff --git a/build.gradle b/build.gradle
index efb1c93..5e094ae 100644
--- a/build.gradle
+++ b/build.gradle
@@ -21,7 +21,7 @@ test {
 
 // plugin version - gradle by convention seems to not use v prefixes. That does
 // cause some issues in other places but we'll stick with convention
-version = '0.3.0'
+version = '0.4.0'
 
 nextflowPlugin {
     // minimum nextflow version
diff --git a/code-generation/groovy-okhttp-sync/model.mustache b/code-generation/groovy-okhttp-sync/model.mustache
index ad02b79..3c6b4f4 100644
--- a/code-generation/groovy-okhttp-sync/model.mustache
+++ b/code-generation/groovy-okhttp-sync/model.mustache
@@ -5,6 +5,7 @@ import groovy.transform.CompileStatic
 import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule
 import com.fasterxml.jackson.annotation.JsonProperty
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties
 
 {{#imports}}
 import {{import}};
diff --git a/code-generation/groovy-okhttp-sync/modelClass.mustache b/code-generation/groovy-okhttp-sync/modelClass.mustache
index f411811..bee68ca 100644
--- a/code-generation/groovy-okhttp-sync/modelClass.mustache
+++ b/code-generation/groovy-okhttp-sync/modelClass.mustache
@@ -2,6 +2,7 @@
 
 @Canonical
 @CompileStatic
+@JsonIgnoreProperties(ignoreUnknown = true)
 class {{classname}} {
 
 {{#vars}}
diff --git a/code-generation/schemas/fuzzball-v3.3-openapi.json b/code-generation/schemas/fuzzball-v3.3-openapi.json
index aa3d999..19b9e0a 100644
--- a/code-generation/schemas/fuzzball-v3.3-openapi.json
+++ b/code-generation/schemas/fuzzball-v3.3-openapi.json
@@ -9053,7 +9053,7 @@
     "fuzzball.api.v3.WorkflowDefinition.Defaults.Job.Mount": {
       "type": "object",
       "properties": {
-        "location": {
+        "volume": {
           "type": "string",
           "description": "location specifies the destination within the container filesystem to\nmount a volume directory. This must be an absolute path."
         }
@@ -9243,7 +9243,7 @@
     "fuzzball.api.v3.WorkflowDefinition.Job.Mount": {
       "type": "object",
       "properties": {
-        "location": {
+        "volume": {
           "type": "string",
           "description": "location specifies the destination within the container filesystem to\nmount a volume directory. This must be an absolute path."
         }
@@ -9625,7 +9625,7 @@
         },
         "readiness-probe": {
           "$ref": "#/definitions/fuzzball.api.v3.WorkflowDefinition.Probe",
-          "title": "readinessProbe controls the STARTED → RUNNING transition of the service (required for proper lifecycle monitoring)"
+          "title": "readinessProbe controls the STARTED \u2192 RUNNING transition of the service (required for proper lifecycle monitoring)"
         }
       }
     },
@@ -10325,4 +10325,4 @@
       }
     }
   }
-}
+}
\ No newline at end of file
diff --git a/src/main/groovy/com/ciq/fuzzball/FuzzballExecutor.groovy b/src/main/groovy/com/ciq/fuzzball/FuzzballExecutor.groovy
index 8a4f08f..a9eca22 100644
--- a/src/main/groovy/com/ciq/fuzzball/FuzzballExecutor.groovy
+++ b/src/main/groovy/com/ciq/fuzzball/FuzzballExecutor.groovy
@@ -99,9 +99,10 @@ class FuzzballExecutor extends Executor implements ExtensionPoint {
         loadEphemeralStorageClasses()
         volumes = filterEphemeralVolumes(allVolumes)
 
-        // Filter mounts to only include those with persistent volumes
-        mounts = allMounts.findAll { mountName, mount ->
-            volumes.containsKey(mountName)
+        // Filter mounts to only include those with persistent volumes.
+        // Path-keyed format (current): map key = container path, mount.volume = volume name.
+        mounts = allMounts.findAll { mountPath, mount ->
+            volumes.containsKey(mount.volume)
         }
     }