diff --git a/src/commands/installSwiftlyToolchain.ts b/src/commands/installSwiftlyToolchain.ts
index 1dcc335c0..99545811b 100644
--- a/src/commands/installSwiftlyToolchain.ts
+++ b/src/commands/installSwiftlyToolchain.ts
@@ -49,31 +49,36 @@ export async function installSwiftlyToolchainWithProgress(
                 await Swiftly.installToolchain(
                     version,
                     (progressData: SwiftlyProgressData) => {
-                        if (
-                            progressData.step?.percent !== undefined &&
-                            progressData.step.percent > lastProgress
-                        ) {
-                            const increment = progressData.step.percent - lastProgress;
+                        if (progressData.complete) {
+                            // Swiftly will also verify the signature and extract the toolchain after the
+                            // "complete" message has been sent, but does not report progress for this.
+                            // Provide a suitable message in this case and reset the progress back to an
+                            // indeterminate state (0) since we don't know how long it will take.
                             progress.report({
-                                increment,
-                                message:
-                                    progressData.step.text ??
-                                    `${progressData.step.percent}% complete`,
+                                message: "Verifying signature and extracting...",
+                                increment: -lastProgress,
                             });
-                            lastProgress = progressData.step.percent;
+                            return;
                         }
+                        if (!progressData.step) {
+                            return;
+                        }
+                        const increment = progressData.step.percent - lastProgress;
+                        progress.report({
+                            increment,
+                            message:
+                                progressData.step.text ?? `${progressData.step.percent}% complete`,
+                        });
+                        lastProgress = progressData.step.percent;
                     },
                     logger,
                     token
                 );
-
-                progress.report({
-                    increment: 100 - lastProgress,
-                    message: "Installation complete",
-                });
             }
         );
 
+        void vscode.window.showInformationMessage(`Successfully installed Swift ${version}`);
+
         return true;
     } catch (error) {
         const errorMessage = (error as Error).message;
@@ -83,7 +88,7 @@ export async function installSwiftlyToolchainWithProgress(
             return false;
         }
 
-        logger?.error(`Failed to install Swift ${version}: ${error}`);
+        logger?.error(new Error(`Failed to install Swift ${version}`, { cause: error }));
         void vscode.window.showErrorMessage(`Failed to install Swift ${version}: ${error}`);
         return false;
     }
diff --git a/src/toolchain/swiftly.ts b/src/toolchain/swiftly.ts
index 771a0cceb..7e58c1a31 100644
--- a/src/toolchain/swiftly.ts
+++ b/src/toolchain/swiftly.ts
@@ -104,13 +104,21 @@ const InUseVersionResult = z.object({
     version: z.string(),
 });
 
-export interface SwiftlyProgressData {
-    step?: {
-        text?: string;
-        timestamp?: number;
-        percent?: number;
-    };
-}
+const SwiftlyProgressData = z.object({
+    complete: z.optional(
+        z.object({
+            success: z.boolean(),
+        })
+    ),
+    step: z.optional(
+        z.object({
+            text: z.string(),
+            percent: z.number(),
+        })
+    ),
+});
+
+export type SwiftlyProgressData = z.infer<typeof SwiftlyProgressData>;
 
 export interface PostInstallValidationResult {
     isValid: boolean;
@@ -510,10 +518,12 @@ export class Swiftly {
                     }
 
                     try {
-                        const progressData = JSON.parse(line.trim()) as SwiftlyProgressData;
+                        const progressData = SwiftlyProgressData.parse(JSON.parse(line));
                         progressCallback(progressData);
-                    } catch (err) {
-                        logger?.error(`Failed to parse progress line: ${err}`);
+                    } catch (error) {
+                        logger?.error(
+                            new Error(`Failed to parse Swiftly progress: ${line}`, { cause: error })
+                        );
                     }
                 });
 
diff --git a/tsconfig-base.json b/tsconfig-base.json
index b2cabb90b..0a88c91b3 100644
--- a/tsconfig-base.json
+++ b/tsconfig-base.json
@@ -5,8 +5,8 @@
     "rootDir": ".",
     "outDir": "dist",
 
-    "lib": ["ES2021"],
-    "target": "ES2020",
+    "lib": ["ES2022"],
+    "target": "ES2022",
     "module": "commonjs",
 
     "strict": true,