diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c2c86115..17764e09b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ and this project adheres to
 
 ## [Unreleased]
 
+### Changed
+
+- ⬆️(backend) upgrade celery to version 5.6.3
+
 ### Fixed
 
 - 🐛(backend) skip session creation for the liveness probe
diff --git a/renovate.json b/renovate.json
index 965dfb618..a7656fc4c 100644
--- a/renovate.json
+++ b/renovate.json
@@ -25,12 +25,6 @@
       "matchPackageNames": ["django"],
       "allowedVersions": "<6.0.0"
     },
-    {
-      "groupName": "allowed celery versions",
-      "matchManagers": ["pep621"],
-      "matchPackageNames": ["celery"],
-      "allowedVersions": "<5.6.0"
-    },
     {
       "groupName": "allowed langfuse versions",
       "matchManagers": ["pep621"],
diff --git a/src/backend/pyproject.toml b/src/backend/pyproject.toml
index 1f08521a0..4aa486f19 100644
--- a/src/backend/pyproject.toml
+++ b/src/backend/pyproject.toml
@@ -27,7 +27,7 @@ dependencies = [
     "beautifulsoup4==4.15.0",
     "boto3==1.43.56",
     "Brotli==1.2.0",
-    "celery[redis]==5.5.3",
+    "celery[redis]==5.6.3",
     "dj-database-url==3.1.2",
     "django-configurations==2.5.1",
     "django-cors-headers==4.9.0",
diff --git a/src/backend/uv.lock b/src/backend/uv.lock
index 5f4829561..8f08fe831 100644
--- a/src/backend/uv.lock
+++ b/src/backend/uv.lock
@@ -150,7 +150,7 @@ wheels = [
 
 [[package]]
 name = "celery"
-version = "5.5.3"
+version = "5.6.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "billiard" },
@@ -160,11 +160,12 @@ dependencies = [
     { name = "click-repl" },
     { name = "kombu" },
     { name = "python-dateutil" },
+    { name = "tzlocal" },
     { name = "vine" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/bb/7d/6c289f407d219ba36d8b384b42489ebdd0c84ce9c413875a8aae0c85f35b/celery-5.5.3.tar.gz", hash = "sha256:6c972ae7968c2b5281227f01c3a3f984037d21c5129d07bf3550cc2afc6b10a5", size = 1667144, upload-time = "2025-06-01T11:08:12.563Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/e8/b4/a1233943ab5c8ea05fb877a88a0a0622bf47444b99e4991a8045ac37ea1d/celery-5.6.3.tar.gz", hash = "sha256:177006bd2054b882e9f01be59abd8529e88879ef50d7918a7050c5a9f4e12912", size = 1742243, upload-time = "2026-03-26T12:14:51.76Z" }
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+    { url = "https://files.pythonhosted.org/packages/cf/c9/6eccdda96e098f7ae843162db2d3c149c6931a24fda69fe4ab84d0027eb5/celery-5.6.3-py3-none-any.whl", hash = "sha256:0808f42f80909c4d5833202360ffafb2a4f83f4d8e23e1285d926610e9a7afa6", size = 451235, upload-time = "2026-03-26T12:14:49.491Z" },
 ]
 
 [package.optional-dependencies]
@@ -1025,7 +1026,7 @@ requires-dist = [
     { name = "beautifulsoup4", specifier = "==4.15.0" },
     { name = "boto3", specifier = "==1.43.56" },
     { name = "brotli", specifier = "==1.2.0" },
-    { name = "celery", extras = ["redis"], specifier = "==5.5.3" },
+    { name = "celery", extras = ["redis"], specifier = "==5.6.3" },
     { name = "dj-database-url", specifier = "==3.1.2" },
     { name = "django", specifier = "<6.0.0" },
     { name = "django-configurations", specifier = "==2.5.1" },
@@ -1268,7 +1269,7 @@ wheels = [
 
 [[package]]
 name = "kombu"
-version = "5.5.4"
+version = "5.6.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "amqp" },
@@ -1276,9 +1277,9 @@ dependencies = [
     { name = "tzdata" },
     { name = "vine" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/0f/d3/5ff936d8319ac86b9c409f1501b07c426e6ad41966fedace9ef1b966e23f/kombu-5.5.4.tar.gz", hash = "sha256:886600168275ebeada93b888e831352fe578168342f0d1d5833d88ba0d847363", size = 461992, upload-time = "2025-06-01T10:19:22.281Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/b6/a5/607e533ed6c83ae1a696969b8e1c137dfebd5759a2e9682e26ff1b97740b/kombu-5.6.2.tar.gz", hash = "sha256:8060497058066c6f5aed7c26d7cd0d3b574990b09de842a8c5aaed0b92cc5a55", size = 472594, upload-time = "2025-12-29T20:30:07.779Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/fb/0f/834427d8c03ff1d7e867d3db3d176470c64871753252b21b4f4897d1fa45/kombu-5.6.2-py3-none-any.whl", hash = "sha256:efcfc559da324d41d61ca311b0c64965ea35b4c55cc04ee36e55386145dace93", size = 214219, upload-time = "2025-12-29T20:30:05.74Z" },
 ]
 
 [package.optional-dependencies]
@@ -2176,11 +2177,14 @@ wheels = [
 
 [[package]]
 name = "redis"
-version = "5.2.1"
+version = "5.3.1"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/47/da/d283a37303a995cd36f8b92db85135153dc4f7a8e4441aa827721b442cfb/redis-5.2.1.tar.gz", hash = "sha256:16f2e22dff21d5125e8481515e386711a34cbec50f0e44413dd7d9c060a54e0f", size = 4608355, upload-time = "2024-12-06T09:50:41.956Z" }
+dependencies = [
+    { name = "pyjwt" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/6a/cf/128b1b6d7086200c9f387bd4be9b2572a30b90745ef078bd8b235042dc9f/redis-5.3.1.tar.gz", hash = "sha256:ca49577a531ea64039b5a36db3d6cd1a0c7a60c34124d46924a45b956e8cf14c", size = 4626200, upload-time = "2025-07-25T08:06:27.778Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/7f/26/5c5fa0e83c3621db835cfc1f1d789b37e7fa99ed54423b5f519beb931aa7/redis-5.3.1-py3-none-any.whl", hash = "sha256:dc1909bd24669cc31b5f67a039700b16ec30571096c5f1f0d9d2324bff31af97", size = 272833, upload-time = "2025-07-25T08:06:26.317Z" },
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 [[package]]
@@ -2558,6 +2562,18 @@ wheels = [
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 ]
 
+[[package]]
+name = "tzlocal"
+version = "5.4.4"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "tzdata", marker = "sys_platform == 'win32'" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/81/5b/879b2f932adfa7a053c360d50bc896c977fa6426109185f7c12ebdd0cb9d/tzlocal-5.4.4.tar.gz", hash = "sha256:8dbb8660838688a7b6ba4fed31d18dedf842afb4d47ca050d6d891c2c15f3be4", size = 31170, upload-time = "2026-06-29T08:03:40.026Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/9e/a4/017a7a6cbe387d961a688ec31364ae60a5c4e22c96ae9921b79a947c855d/tzlocal-5.4.4-py3-none-any.whl", hash = "sha256:aae09f0126a8a86fa736be266eb4a471380d26a0de3bc14844e7821fee3e2a15", size = 18115, upload-time = "2026-06-29T08:03:38.666Z" },
+]
+
 [[package]]
 name = "uritemplate"
 version = "4.2.0"
@@ -2569,11 +2585,11 @@ wheels = [
 
 [[package]]
 name = "urllib3"
-version = "2.6.3"
+version = "2.7.0"
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+    { url = "https://files.pythonhosted.org/packages/7f/3e/5db95bcf282c52709639744ca2a8b149baccf648e39c8cc87553df9eae0c/urllib3-2.7.0-py3-none-any.whl", hash = "sha256:9fb4c81ebbb1ce9531cce37674bbc6f1360472bc18ca9a553ede278ef7276897", size = 131087, upload-time = "2026-05-07T16:13:17.151Z" },
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 [[package]]