diff --git a/lib/purchaseQueries.ts b/lib/purchaseQueries.ts
index ecf4506..b85a745 100644
--- a/lib/purchaseQueries.ts
+++ b/lib/purchaseQueries.ts
@@ -115,7 +115,7 @@ export function getPurchasesForArticle(articleId: string, timeoutMs: number = 50
     const sub = createSubscription(pool, [relayUrl], filters)
     let finished = false
 
-    const done = async () => {
+    const done = async (): Promise<void> => {
       if (finished) {
         return
       }
@@ -124,7 +124,7 @@ export function getPurchasesForArticle(articleId: string, timeoutMs: number = 50
       resolve(results)
     }
 
-    sub.on('event', async (event: Event) => {
+    sub.on('event', async (event: Event): Promise<void> => {
       const parsed = await parsePurchaseFromEvent(event)
       if (parsed?.articleId === articleId) {
         // Cache the parsed purchase
@@ -155,7 +155,7 @@ export function getPurchasesByPayer(payerPubkey: string, timeoutMs: number = 500
     const sub = createSubscription(pool, [relayUrl], filters)
     let finished = false
 
-    const done = async () => {
+    const done = async (): Promise<void> => {
       if (finished) {
         return
       }
@@ -164,7 +164,7 @@ export function getPurchasesByPayer(payerPubkey: string, timeoutMs: number = 500
       resolve(results)
     }
 
-    sub.on('event', async (event: Event) => {
+    sub.on('event', async (event: Event): Promise<void> => {
       const parsed = await parsePurchaseFromEvent(event)
       if (parsed) {
         // Cache the parsed purchase
@@ -175,7 +175,9 @@ export function getPurchasesByPayer(payerPubkey: string, timeoutMs: number = 500
       }
     })
 
-    sub.on('eose', () => done())
+    sub.on('eose', (): void => {
+      void done()
+    })
     setTimeout(() => done(), timeoutMs).unref?.()
   })
 }
diff --git a/lib/sponsoringQueries.ts b/lib/sponsoringQueries.ts
index 8d1c47f..f3934a5 100644
--- a/lib/sponsoringQueries.ts
+++ b/lib/sponsoringQueries.ts
@@ -113,7 +113,7 @@ export function getSponsoringByAuthor(authorPubkey: string, timeoutMs: number =
     const sub = createSubscription(pool, [relayUrl], filters)
     let finished = false
 
-    const done = async () => {
+    const done = async (): Promise<void> => {
       if (finished) {
         return
       }
@@ -122,7 +122,7 @@ export function getSponsoringByAuthor(authorPubkey: string, timeoutMs: number =
       resolve(results)
     }
 
-    sub.on('event', async (event: Event) => {
+    sub.on('event', async (event: Event): Promise<void> => {
       const parsed = await parseSponsoringFromEvent(event)
       if (parsed?.authorPubkey === authorPubkey) {
         // Cache the parsed sponsoring
@@ -133,7 +133,9 @@ export function getSponsoringByAuthor(authorPubkey: string, timeoutMs: number =
       }
     })
 
-    sub.on('eose', () => done())
+    sub.on('eose', (): void => {
+      void done()
+    })
     setTimeout(() => done(), timeoutMs).unref?.()
   })
 }