diff --git a/src/blobs/carrier.ts b/src/blobs/carrier.ts
index c3e3d959a..5eff293ca 100644
--- a/src/blobs/carrier.ts
+++ b/src/blobs/carrier.ts
@@ -60,7 +60,7 @@ export async function fetchUpdateConfig(
     log(`requestData: ${outFile}`)
     await fs.writeFile(outFile, JSON.stringify(Request.toJSON(requestData), null, 4))
   }
-  const encodedRequest = Request.encode(requestData).finish()
+  const encodedRequest = Buffer.from(Request.encode(requestData).finish())
   if (debug) {
     const reqFile = path.join(tmpDir, 'encodedRequestData')
     await fs.writeFile(reqFile, encodedRequest)
diff --git a/src/commands/collect-state.ts b/src/commands/collect-state.ts
index ed301e6a4..160d4e398 100644
--- a/src/commands/collect-state.ts
+++ b/src/commands/collect-state.ts
@@ -320,7 +320,7 @@ async function runStateCollectionBuild(
       break
     } catch (e) {
       logElapsedTime(buildStart, `${device} phase ${phase} state collection build failed in`)
-      let stderr = e.message as string
+      let stderr = (e as Error).message as string
       if (stderr !== undefined) {
         log(`\n${statusPrefix}stderr:\n` + stderr)
       }
diff --git a/src/commands/fetch-build-index.ts b/src/commands/fetch-build-index.ts
index 5b41e0884..2ba305464 100644
--- a/src/commands/fetch-build-index.ts
+++ b/src/commands/fetch-build-index.ts
@@ -1,5 +1,5 @@
 import { Command, Flags } from '@oclif/core'
-import { YAMLMap } from 'yaml/types'
+import { YAMLMap } from 'yaml'
 
 import assert from 'assert'
 import YAML, { Document } from 'yaml'
diff --git a/src/commands/update-carrier-settings.ts b/src/commands/update-carrier-settings.ts
index 614b68b68..61c67e2c2 100644
--- a/src/commands/update-carrier-settings.ts
+++ b/src/commands/update-carrier-settings.ts
@@ -1,4 +1,5 @@
 import { Command, Flags } from '@oclif/core'
+import util from 'util'
 
 import { downloadAllConfigs, fetchUpdateConfig, getCarrierSettingsUpdatesDir } from '../blobs/carrier'
 import { BUILD_VERSION_SDK_PROP, loadPartitionProps } from '../blobs/props'
@@ -46,7 +47,7 @@ export default class UpdateCarrierSettings extends Command {
           )
           let sdkVersion = mapGet(mapGet(stockProps, Partition.System), BUILD_VERSION_SDK_PROP)
           const updateConfig = await fetchUpdateConfig(config.device.name, buildId, sdkVersion, flags.debug)
-          if (flags.debug) log(updateConfig)
+          if (flags.debug) log(util.inspect(updateConfig, false, Infinity))
           await downloadAllConfigs(updateConfig, outDir, flags.debug)
         } else {
           this.log(`${config.device.name} is not supported due to lack of cellular connectivity`)
diff --git a/src/frontend/source.ts b/src/frontend/source.ts
index 96a1b98cc..482d38a50 100644
--- a/src/frontend/source.ts
+++ b/src/frontend/source.ts
@@ -1,5 +1,5 @@
 import assert from 'assert'
-import { createReadStream, promises as fs } from 'fs'
+import { createReadStream, promises as fs, ReadOptionsWithBuffer } from 'fs'
 import { FileHandle, FileReadOptions } from 'fs/promises'
 import hasha from 'hasha'
 import path from 'path'
@@ -584,11 +584,12 @@ class FdReader extends yauzl.Reader {
     // do not initialize buffer contents, assert below ensures that it's fully written out
     let buffer = Buffer.allocUnsafe(length)
 
-    let opts = {
-      buffer,
-      length,
+    let opts: ReadOptionsWithBuffer<any> = {
+      buffer: buffer,
+      length: length,
+      offset: 0,
       position: this.off + start,
-    } as FileReadOptions
+    }
 
     assert((await this.fd.read(opts)).bytesRead === length)
     return buffer
diff --git a/src/images/build-index.ts b/src/images/build-index.ts
index 911ce848f..7d00748a2 100644
--- a/src/images/build-index.ts
+++ b/src/images/build-index.ts
@@ -2,7 +2,7 @@ import assert from 'assert'
 import { JSDOM } from 'jsdom'
 import fetch from 'node-fetch'
 import path from 'path'
-import { Document, YAMLMap } from 'yaml'
+import { Document as YAMLDocument, YAMLMap } from 'yaml'
 
 import { loadAndMergeConfig } from '../config/config-loader'
 import { DeviceBuildId, DeviceConfig, makeDeviceBuildId } from '../config/device'
@@ -108,7 +108,7 @@ async function fetchBuildIndexInner(
     }
   }
 
-  return new Document().createNode(buildIndex) as YAMLMap
+  return new YAMLDocument().createNode(buildIndex) as YAMLMap
 }
 
 function parseFactoryOrOtaPage(buildIndex: BuildIndex, pageType: string, dom: JSDOM, devices: Set<string>) {
diff --git a/src/images/download.ts b/src/images/download.ts
index 5284fe1a6..703930d70 100644
--- a/src/images/download.ts
+++ b/src/images/download.ts
@@ -84,6 +84,10 @@ async function downloadImageInner(
   if (!resp.ok) {
     throw new Error(`${resp.status}: ${resp.statusText}; ${image.toString()} `)
   }
+  if (resp.body === null) {
+    throw new Error(`missing response body for ${image.toString()}`)
+  }
+
 
   let downloaded = 0
   let totalSizeStr: string | null
diff --git a/src/util/exact-filter.ts b/src/util/exact-filter.ts
index 5f7e3aa8c..5bc877670 100644
--- a/src/util/exact-filter.ts
+++ b/src/util/exact-filter.ts
@@ -81,7 +81,7 @@ interface FilterEntries2Result<T> {
   hasTransforms: boolean
 }
 
-export function filterEntries2<T>(cmd: EntryFilter2Cmd<T>) {
+export function filterEntries2<T extends Record<string, unknown>>(cmd: EntryFilter2Cmd<T>) {
   let unknownEntries: string[] = []
   let filtered: [string, T][] = []
   let hasTransforms = false
diff --git a/src/util/log.ts b/src/util/log.ts
index 8f5ff8a13..931a9aaf8 100644
--- a/src/util/log.ts
+++ b/src/util/log.ts
@@ -69,7 +69,7 @@ function updateStatusLines() {
   }
 }
 
-let pendingWrites: unknown[] = []
+let pendingWrites: (string | Buffer | Uint8Array)[] = []
 let currentStatus: string | null = null
 
 let isClearPending = false
@@ -149,7 +149,7 @@ function write(str: string | Buffer | Uint8Array, callback?: () => void) {
   }
 }
 
-export function log(str: string | Buffer | DataView) {
+export function log(str: string | Buffer | Uint8Array) {
   if (currentStatus !== null) {
     clearStatusLines()
     write(str)