diff --git a/.changeset/restore-cjs-loadable-deps.md b/.changeset/restore-cjs-loadable-deps.md
new file mode 100644
index 000000000..4c116fe4f
--- /dev/null
+++ b/.changeset/restore-cjs-loadable-deps.md
@@ -0,0 +1,6 @@
+---
+"@slack/web-api": patch
+"@slack/webhook": patch
+---
+
+fix: revert internal packages requiring esm loading for backward compatible support ([#2711](https://github.com/slackapi/node-slack-sdk/issues/2711))
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index e3642c765..8d5426c20 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -186,6 +186,9 @@ updates:
           - "@types/mocha"
           - "mocha"
     ignore:
+      # Avoid pure ESM p-queue (v7+) / p-retry (v5+) to prevent CJS require() breakage on Node >= 20 (see #2711).
+      - dependency-name: "p-queue"
+      - dependency-name: "p-retry"
       - dependency-name: "@types/node"
         versions:
           - "21.x"
@@ -215,9 +218,7 @@ updates:
           - "@types/mocha"
           - "mocha"
     ignore:
-      # p-retry is pure ESM and raises its minimum Node.js version each major
-      # (v7 requires Node >= 20, v8 requires Node >= 22). Bumping it can force a
-      # change to this package's own supported Node floor.
+      # Avoid pure ESM p-retry (v5+) to prevent CJS require() breakage on Node >= 20 (see #2711).
       - dependency-name: "p-retry"
       - dependency-name: "@types/node"
         versions:
diff --git a/package-lock.json b/package-lock.json
index c54e97e91..7eaf5a532 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3014,18 +3014,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/is-network-error": {
-      "version": "1.3.2",
-      "resolved": "https://registry.npmjs.org/is-network-error/-/is-network-error-1.3.2.tgz",
-      "integrity": "sha512-PhBY86zaxNZUuWP6h13Vu5oFe0XY6/UlKzQnYFELzGVHygP3MxmvTfYSG7GN3aIab/iWudSMgjSnG9Dq+nHrgA==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=16"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
     "node_modules/is-node-process": {
       "version": "1.2.0",
       "dev": true,
@@ -3829,22 +3817,10 @@
         "node": ">=6"
       }
     },
-    "node_modules/p-queue": {
-      "version": "9.3.1",
-      "license": "MIT",
-      "dependencies": {
-        "eventemitter3": "^5.0.4",
-        "p-timeout": "^7.0.0"
-      },
-      "engines": {
-        "node": ">=20"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
     "node_modules/p-retry": {
       "version": "4.6.2",
+      "resolved": "https://registry.npmjs.org/p-retry/-/p-retry-4.6.2.tgz",
+      "integrity": "sha512-312Id396EbJdvRONlngUx0NydfrIQ5lsYu0znKVUzVvArzEIt08V1qhtyESbGVd1FGX7UKtiFp5uwKZdM8wIuQ==",
       "license": "MIT",
       "dependencies": {
         "@types/retry": "0.12.0",
@@ -3854,16 +3830,6 @@
         "node": ">=8"
       }
     },
-    "node_modules/p-timeout": {
-      "version": "7.0.1",
-      "license": "MIT",
-      "engines": {
-        "node": ">=20"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
     "node_modules/p-try": {
       "version": "2.2.0",
       "dev": true,
@@ -5759,8 +5725,8 @@
         "@types/node": ">=20",
         "@types/retry": "0.12.5",
         "eventemitter3": "^5.0.1",
-        "p-queue": "^9",
-        "p-retry": "^8",
+        "p-queue": "^6.6.2",
+        "p-retry": "^4.6.2",
         "retry": "^0.13.1"
       },
       "devDependencies": {
@@ -5789,21 +5755,40 @@
       "integrity": "sha512-3xSjTp3v03X/lSQLkczaN9UIEwJMoMCA1+Nb5HfbJEQWogdeQIyVtTvxPXDQjZ5zws8rFQfVfRdz03ARihPJgw==",
       "license": "MIT"
     },
-    "packages/web-api/node_modules/p-retry": {
-      "version": "8.0.0",
-      "resolved": "https://registry.npmjs.org/p-retry/-/p-retry-8.0.0.tgz",
-      "integrity": "sha512-kFVqH1HxOHp8LupNsOys7bSV09VYTRLxarH/mokO4Rqhk6wGi70E0jh4VzvVGXfEVNggHoHLAMWsQqHyU1Ey9A==",
+    "packages/web-api/node_modules/p-queue": {
+      "version": "6.6.2",
+      "resolved": "https://registry.npmjs.org/p-queue/-/p-queue-6.6.2.tgz",
+      "integrity": "sha512-RwFpb72c/BhQLEXIZ5K2e+AhgNVmIejGlTgiB9MzZ0e93GRvqZ7uSi0dvRF7/XIXDeNkra2fNHBxTyPDGySpjQ==",
       "license": "MIT",
       "dependencies": {
-        "is-network-error": "^1.3.0"
+        "eventemitter3": "^4.0.4",
+        "p-timeout": "^3.2.0"
       },
       "engines": {
-        "node": ">=22"
+        "node": ">=8"
       },
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "packages/web-api/node_modules/p-queue/node_modules/eventemitter3": {
+      "version": "4.0.7",
+      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-4.0.7.tgz",
+      "integrity": "sha512-8guHBZCwKnFhYdHr2ysuRWErTwhoN2X8XELRlrRwpmfeY2jjuUN4taQMsULKUVo1K4DvZl+0pgfyoysHxvmvEw==",
+      "license": "MIT"
+    },
+    "packages/web-api/node_modules/p-timeout": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/p-timeout/-/p-timeout-3.2.0.tgz",
+      "integrity": "sha512-rhIwUycgwwKcP9yTOOFK/AKsAopjjCakVqLHePO3CC6Mir1Z99xT+R63jZxAT5lFZLa2inS5h+ZS2GvR99/FBg==",
+      "license": "MIT",
+      "dependencies": {
+        "p-finally": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "packages/web-api/node_modules/undici-types": {
       "version": "7.19.2",
       "license": "MIT"
@@ -5816,7 +5801,7 @@
         "@slack/types": "^3.1.0",
         "@types/node": ">=20",
         "@types/retry": "0.12.5",
-        "p-retry": "^8",
+        "p-retry": "^4.6.2",
         "retry": "^0.13.1"
       },
       "devDependencies": {
@@ -5840,21 +5825,6 @@
       "integrity": "sha512-3xSjTp3v03X/lSQLkczaN9UIEwJMoMCA1+Nb5HfbJEQWogdeQIyVtTvxPXDQjZ5zws8rFQfVfRdz03ARihPJgw==",
       "license": "MIT"
     },
-    "packages/webhook/node_modules/p-retry": {
-      "version": "8.0.0",
-      "resolved": "https://registry.npmjs.org/p-retry/-/p-retry-8.0.0.tgz",
-      "integrity": "sha512-kFVqH1HxOHp8LupNsOys7bSV09VYTRLxarH/mokO4Rqhk6wGi70E0jh4VzvVGXfEVNggHoHLAMWsQqHyU1Ey9A==",
-      "license": "MIT",
-      "dependencies": {
-        "is-network-error": "^1.3.0"
-      },
-      "engines": {
-        "node": ">=22"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
     "packages/webhook/node_modules/undici-types": {
       "version": "7.19.2",
       "license": "MIT"
diff --git a/packages/web-api/package.json b/packages/web-api/package.json
index 8a6daa081..d199ad9e3 100644
--- a/packages/web-api/package.json
+++ b/packages/web-api/package.json
@@ -53,8 +53,8 @@
     "@types/node": ">=20",
     "@types/retry": "0.12.5",
     "eventemitter3": "^5.0.1",
-    "p-queue": "^9",
-    "p-retry": "^8",
+    "p-queue": "^6.6.2",
+    "p-retry": "^4.6.2",
     "retry": "^0.13.1"
   },
   "devDependencies": {
diff --git a/packages/webhook/package.json b/packages/webhook/package.json
index 5c4f9749f..250d39211 100644
--- a/packages/webhook/package.json
+++ b/packages/webhook/package.json
@@ -44,7 +44,7 @@
     "@slack/types": "^3.1.0",
     "@types/node": ">=20",
     "@types/retry": "0.12.5",
-    "p-retry": "^8",
+    "p-retry": "^4.6.2",
     "retry": "^0.13.1"
   },
   "devDependencies": {