diff --git a/.github/workflows/master.yml b/.github/workflows/master.yml
index 5e0b1f0..a405812 100644
--- a/.github/workflows/master.yml
+++ b/.github/workflows/master.yml
@@ -45,7 +45,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        deno-version: [v2.8.0]
+        deno-version: [v1.46.3, v2.8.0]
         os: [ ubuntu-latest, windows-latest ]
     runs-on: ${{ matrix.os }}
 
@@ -58,5 +58,10 @@ jobs:
         with:
           deno-version: ${{ matrix.deno-version }}
 
-      - name: Run tests
+      - name: Run tests (Deno v1)
+        if: "contains(matrix.deno-version, 'v1')"
+        run: deno task test-v1
+
+      - name: Run tests (Deno v2)
+        if: "contains(matrix.deno-version, 'v2')"
         run: deno task test
\ No newline at end of file
diff --git a/README.md b/README.md
index 4918183..ffd5cbe 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,7 @@ A Deno SDK for Switcher API
 
 ### Prerequisites
 
-- **Deno**: Version 2.x or above
+- **Deno**: Version 1.4x, 2.x or later
 - **Permissions**:
 
 | Permission | Required For |
@@ -75,6 +75,7 @@ A Deno SDK for Switcher API
 | `--allow-write` | Writing snapshot files (if enabled) |
 | `--allow-net` | Communicating with the Switcher API |
 | `--allow-env` | Accessing environment variables for configuration |
+| `--unstable-http` | Required for custom SSL certificates in Deno v1.4x (see [Advanced Options](#advanced-options)) |
 
 ### Installation
 
diff --git a/deno.jsonc b/deno.jsonc
index a32ddc4..4284553 100644
--- a/deno.jsonc
+++ b/deno.jsonc
@@ -7,6 +7,7 @@
     "fmt": "deno fmt mod.ts src/ --options-single-quote --options-line-width=120 --check",
     "fmt:fix": "deno fmt mod.ts src/ --options-single-quote --options-line-width=120",
     "test": "deno test --allow-read --allow-net --allow-write --allow-env --allow-import --coverage=coverage",
+    "test-v1": "deno test --allow-read --allow-net --allow-write --allow-env --unstable-http --coverage=coverage",
     "clean": "rm -rf ./npm ./coverage ./generated-snapshots",
     "lcov": "deno coverage coverage --lcov --output=coverage/report.lcov",
     "cover": "deno task clean && deno task test && deno task lcov && genhtml -o coverage/html coverage/report.lcov",
diff --git a/src/lib/remoteAuth.ts b/src/lib/remoteAuth.ts
index 2550791..ec99a21 100644
--- a/src/lib/remoteAuth.ts
+++ b/src/lib/remoteAuth.ts
@@ -11,7 +11,7 @@ import * as util from './utils/index.ts';
 export class Auth {
   private static context: SwitcherContext;
   private static retryOptions: RetryOptions;
-  private static refreshTimer: NodeJS.Timeout | undefined;
+  private static refreshTimer: ReturnType<typeof setInterval> | undefined;
 
   static init(context: SwitcherContext) {
     this.context = context;
diff --git a/src/lib/snapshotWatcher.ts b/src/lib/snapshotWatcher.ts
index e46ae5f..b16d528 100644
--- a/src/lib/snapshotWatcher.ts
+++ b/src/lib/snapshotWatcher.ts
@@ -10,7 +10,7 @@ import * as util from './utils/index.ts';
  */
 export class SnapshotWatcher {
   private _watcher: Deno.FsWatcher | undefined;
-  private readonly _watchDebounce = new Map<string, NodeJS.Timeout>();
+  private readonly _watchDebounce = new Map<string, ReturnType<typeof setInterval>>();
 
   async watchSnapshot(environment: string, callback: {
     success?: () => void | Promise<void>;
diff --git a/src/lib/utils/snapshotAutoUpdater.ts b/src/lib/utils/snapshotAutoUpdater.ts
index 69185ed..bd4d93c 100644
--- a/src/lib/utils/snapshotAutoUpdater.ts
+++ b/src/lib/utils/snapshotAutoUpdater.ts
@@ -1,5 +1,5 @@
 export default class SnapshotAutoUpdater {
-  private static _intervalId: NodeJS.Timeout | undefined;
+  private static _intervalId: ReturnType<typeof setInterval> | undefined;
 
   static schedule(
     interval: number,