diff --git a/appmgr/src/install/mod.rs b/appmgr/src/install/mod.rs
index fc6e250cc..d385469da 100644
--- a/appmgr/src/install/mod.rs
+++ b/appmgr/src/install/mod.rs
@@ -84,27 +84,27 @@ pub async fn list(#[context] ctx: RpcContext) -> Result<Vec<(PackageId, Version)
 pub async fn install(
     #[context] ctx: RpcContext,
     #[arg] id: String,
+    #[arg(rename = "version-spec")] version_spec: Option<String>,
 ) -> Result<WithRevision<()>, Error> {
-    let (pkg_id, version_str) = if let Some(split) = id.split_once("@") {
-        split
-    } else {
-        (id.as_str(), "*")
+    let version_str = match &version_spec {
+        None => "*",
+        Some(v) => &*v,
     };
     let version: VersionRange = version_str.parse()?;
     let reg_url = ctx.package_registry_url().await?;
     let (man_res, s9pk) = tokio::try_join!(
         reqwest::get(format!(
-            "{}/package/manifest/{}?version={}&eos-version-compat={}&arch={}",
+            "{}/package/manifest/{}?spec={}&eos-version-compat={}&arch={}",
             reg_url,
-            pkg_id,
+            id,
             version,
             Current::new().compat(),
             platforms::TARGET_ARCH,
         )),
         reqwest::get(format!(
-            "{}/package/{}.s9pk?version={}&eos-version-compat={}&arch={}",
+            "{}/package/{}.s9pk?spec={}&eos-version-compat={}&arch={}",
             reg_url,
-            pkg_id,
+            id,
             version,
             Current::new().compat(),
             platforms::TARGET_ARCH,
@@ -319,7 +319,11 @@ pub async fn sideload(
 }
 
 #[instrument(skip(ctx))]
-async fn cli_install(ctx: CliContext, target: String) -> Result<(), RpcError> {
+async fn cli_install(
+    ctx: CliContext,
+    target: String,
+    version_spec: Option<String>,
+) -> Result<(), RpcError> {
     if target.ends_with(".s9pk") {
         let path = PathBuf::from(target);
 
@@ -360,11 +364,23 @@ async fn cli_install(ctx: CliContext, target: String) -> Result<(), RpcError> {
             tracing::info!("Package Upload failed: {}", res.text().await?)
         }
     } else {
+        let params = match (target.split_once("@"), version_spec) {
+            (Some((pkg, v)), None) => serde_json::json!({ "id": pkg, "version-spec": v }),
+            (Some((pkg, v)), Some(_)) => {
+                return Err(crate::Error::new(
+                    eyre!("Invalid package id {}", target),
+                    ErrorKind::InvalidRequest,
+                )
+                .into())
+            }
+            (None, Some(v)) => serde_json::json!({ "id": target, "version-spec": v }),
+            (None, None) => serde_json::json!({ "id": target }),
+        };
         tracing::debug!("calling package.install");
         rpc_toolkit::command_helpers::call_remote(
             ctx,
             "package.install",
-            serde_json::json!({ "id": target }),
+            params,
             PhantomData::<()>,
         )
         .await?
@@ -580,7 +596,7 @@ pub async fn install_s9pk<R: AsyncRead + AsyncSeek + Unpin>(
     let reg_url = ctx.package_registry_url().await?;
     for (dep, info) in &manifest.dependencies.0 {
         let manifest: Option<Manifest> = match reqwest::get(format!(
-            "{}/package/manifest/{}?version={}&eos-version-compat={}&arch={}",
+            "{}/package/manifest/{}?spec={}&eos-version-compat={}&arch={}",
             reg_url,
             dep,
             info.version,
@@ -610,7 +626,7 @@ pub async fn install_s9pk<R: AsyncRead + AsyncSeek + Unpin>(
             if tokio::fs::metadata(&icon_path).await.is_err() {
                 tokio::fs::create_dir_all(&dir).await?;
                 let icon = reqwest::get(format!(
-                    "{}/package/icon/{}?version={}&eos-version-compat={}&arch={}",
+                    "{}/package/icon/{}?spec={}&eos-version-compat={}&arch={}",
                     reg_url,
                     dep,
                     info.version,
diff --git a/appmgr/src/update/mod.rs b/appmgr/src/update/mod.rs
index 655c2ff11..5597a1383 100644
--- a/appmgr/src/update/mod.rs
+++ b/appmgr/src/update/mod.rs
@@ -329,7 +329,7 @@ impl std::fmt::Display for EosUrl {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(
             f,
-            "{}/eos/eos.img?version=={}&eos-version={}&arch={}",
+            "{}/eos/eos.img?spec=={}&eos-version={}&arch={}",
             self.base,
             self.version,
             Current::new().semver(),
diff --git a/ui/src/app/components/install-wizard/prebaked-wizards.ts b/ui/src/app/components/install-wizard/prebaked-wizards.ts
index f52b655b5..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 }),
+            executeAction: () => this.embassyApi.installPackage({ id, 'version-spec': version ? `=${version}` : undefined }),
           },
         },
         bottomBar: {
@@ -158,7 +158,7 @@ export class WizardBaker {
             action,
             verb: 'beginning downgrade for',
             title,
-            executeAction: () => this.embassyApi.installPackage({ id, version }),
+            executeAction: () => this.embassyApi.installPackage({ id, 'version-spec': version ? `=${version}` : undefined }),
           },
         },
         bottomBar: {
diff --git a/ui/src/app/pages/apps-routes/app-list/app-list.page.ts b/ui/src/app/pages/apps-routes/app-list/app-list.page.ts
index 91c49dee5..52de7e19c 100644
--- a/ui/src/app/pages/apps-routes/app-list/app-list.page.ts
+++ b/ui/src/app/pages/apps-routes/app-list/app-list.page.ts
@@ -118,7 +118,7 @@ export class AppListPage {
   async install (pkg: RecoveredInfo): Promise<void> {
     pkg.installing = true
     try {
-      await this.api.installPackage({ id: pkg.id, version: undefined })
+      await this.api.installPackage({ id: pkg.id, 'version-spec': undefined })
     } catch (e) {
       this.errToast.present(e)
       pkg.installing = false
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 5ac6da8d7..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 })
+      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 f97c2dc0e..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