diff --git a/ui/src/app/components/install-wizard/prebaked-wizards.ts b/ui/src/app/components/install-wizard/prebaked-wizards.ts
index 82ebb07eb..cacf0e5d5 100644
--- a/ui/src/app/components/install-wizard/prebaked-wizards.ts
+++ b/ui/src/app/components/install-wizard/prebaked-wizards.ts
@@ -59,7 +59,7 @@ export class WizardBaker {
             action,
             verb: 'beginning update for',
             title,
-            executeAction: () => this.embassyApi.installPackage({ id, version: version ? `=${version}` : undefined }),
+            executeAction: () => this.embassyApi.installPackage({ id, 'version-spec': version ? `=${version}` : undefined }),
           },
         },
         bottomBar: {
@@ -158,7 +158,7 @@ export class WizardBaker {
             action,
             verb: 'beginning downgrade for',
             title,
-            executeAction: () => this.embassyApi.installPackage({ id, version: version ? `=${version}` : undefined }),
+            executeAction: () => this.embassyApi.installPackage({ id, 'version-spec': version ? `=${version}` : undefined }),
           },
         },
         bottomBar: {
diff --git a/ui/src/app/pages/marketplace-routes/marketplace-show/marketplace-show.page.ts b/ui/src/app/pages/marketplace-routes/marketplace-show/marketplace-show.page.ts
index 3052f1e13..99fafcd12 100644
--- a/ui/src/app/pages/marketplace-routes/marketplace-show/marketplace-show.page.ts
+++ b/ui/src/app/pages/marketplace-routes/marketplace-show/marketplace-show.page.ts
@@ -191,7 +191,7 @@ export class MarketplaceShowPage {
     loader.present()
 
     try {
-      await this.embassyApi.installPackage({ id, version: version ? `=${version}` : undefined })
+      await this.embassyApi.installPackage({ id, 'version-spec': version ? `=${version}` : undefined })
     } catch (e) {
       this.errToast.present(e)
     } finally {
diff --git a/ui/src/app/services/api/api.types.ts b/ui/src/app/services/api/api.types.ts
index 06172e22f..5ba73ed9a 100644
--- a/ui/src/app/services/api/api.types.ts
+++ b/ui/src/app/services/api/api.types.ts
@@ -142,7 +142,7 @@ export module RR {
   export type GetPackageMetricsReq = { id: string } // package.metrics
   export type GetPackageMetricsRes = Metric
 
-  export type InstallPackageReq = WithExpire<{ id: string, version?: string }> // package.install
+  export type InstallPackageReq = WithExpire<{ id: string, 'version-spec'?: string }> // package.install
   export type InstallPackageRes = WithRevision<null>
 
   export type DryUpdatePackageReq = { id: string, version: string } // package.update.dry