diff --git a/.changeset/remove-jest-when-dep.md b/.changeset/remove-jest-when-dep.md
new file mode 100644
index 0000000000..0167661523
--- /dev/null
+++ b/.changeset/remove-jest-when-dep.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-scaffolder-backend-module-rails': patch
+---
+
+Removed unused `jest-when` dev dependency.
diff --git a/plugins/scaffolder-backend-module-rails/knip-report.md b/plugins/scaffolder-backend-module-rails/knip-report.md
index c7301f2b85..4f1f5a0a1d 100644
--- a/plugins/scaffolder-backend-module-rails/knip-report.md
+++ b/plugins/scaffolder-backend-module-rails/knip-report.md
@@ -1,8 +1,3 @@
 # Knip report
 
-## Unused devDependencies (1)
-
-| Name      | Location     | Severity |
-| :-------- | :----------- | :------- |
-| jest-when | plugins/scaffolder-backend-module-rails/package.json | error    |
-
+No issues found.
diff --git a/plugins/scaffolder-backend-module-rails/package.json b/plugins/scaffolder-backend-module-rails/package.json
index aa851e6bdc..19653745f5 100644
--- a/plugins/scaffolder-backend-module-rails/package.json
+++ b/plugins/scaffolder-backend-module-rails/package.json
@@ -59,7 +59,6 @@
     "@backstage/plugin-scaffolder-node-test-utils": "workspace:^",
     "@types/command-exists": "^1.2.0",
     "@types/fs-extra": "^11.0.0",
-    "@types/node": "^22.13.14",
-    "jest-when": "^3.1.0"
+    "@types/node": "^22.13.14"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 71c8a78e65..4ae9408c04 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6755,7 +6755,6 @@ __metadata:
     "@types/node": "npm:^22.13.14"
     command-exists: "npm:^1.2.9"
     fs-extra: "npm:^11.0.0"
-    jest-when: "npm:^3.1.0"
     yaml: "npm:^2.0.0"
   languageName: unknown
   linkType: soft
@@ -35664,15 +35663,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"jest-when@npm:^3.1.0":
-  version: 3.7.0
-  resolution: "jest-when@npm:3.7.0"
-  peerDependencies:
-    jest: ">= 25"
-  checksum: 10/b5b88d077ed467aab220c71c885dbc5f448604f06e68f761ce9f479c99bb74e0dbf553d1cc980751d88401b034a578e1c44eec5e4095743b7586f02bb7c6313d
-  languageName: node
-  linkType: hard
-
 "jest-worker@npm:30.2.0":
   version: 30.2.0
   resolution: "jest-worker@npm:30.2.0"