diff --git a/poetry.lock b/poetry.lock
index abb9eea..7c58759 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -74,7 +74,7 @@ name = "apache-skywalking"
 version = "0.7.0"
 description = "Python Agent for Apache SkyWalking"
 category = "main"
-optional = false
+optional = true
 python-versions = "*"
 
 [package.dependencies]
@@ -338,7 +338,7 @@ name = "grpcio"
 version = "1.42.0"
 description = "HTTP/2-based RPC framework"
 category = "main"
-optional = false
+optional = true
 python-versions = ">=3.6"
 
 [package.dependencies]
@@ -352,7 +352,7 @@ name = "grpcio-tools"
 version = "1.42.0"
 description = "Protobuf code generator for gRPC"
 category = "main"
-optional = false
+optional = true
 python-versions = ">=3.6"
 
 [package.dependencies]
@@ -665,7 +665,7 @@ name = "protobuf"
 version = "3.19.1"
 description = "Protocol Buffers"
 category = "main"
-optional = false
+optional = true
 python-versions = ">=3.5"
 
 [[package]]
@@ -931,11 +931,11 @@ python-versions = ">=3.6"
 
 [[package]]
 name = "ujson"
-version = "4.3.0"
+version = "5.2.0"
 description = "Ultra fast JSON encoder and decoder for Python"
 category = "main"
 optional = true
-python-versions = ">=3.6"
+python-versions = ">=3.7"
 
 [[package]]
 name = "urllib3"
@@ -1020,6 +1020,7 @@ docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
 testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
 
 [extras]
+apache-skywalking = ["apache-skywalking"]
 config = ["environs"]
 ojson = ["ojson"]
 opentracing = ["opentracing"]
@@ -1032,7 +1033,7 @@ ujson = ["ujson"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "8055c0b2c1acd2798c9141265c4570d4f585f4544ed96c50c8adbc5b4060bbe2"
+content-hash = "9e8490893946f1335430374b8664e658995e050423f0c27ce2bae8320399868d"
 
 [metadata.files]
 aio-statsd = [
@@ -1766,6 +1767,11 @@ regex = [
     {file = "regex-2021.11.10-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:30ab804ea73972049b7a2a5c62d97687d69b5a60a67adca07eb73a0ddbc9e29f"},
     {file = "regex-2021.11.10-cp310-cp310-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:68a067c11463de2a37157930d8b153005085e42bcb7ad9ca562d77ba7d1404e0"},
     {file = "regex-2021.11.10-cp310-cp310-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:162abfd74e88001d20cb73ceaffbfe601469923e875caf9118333b1a4aaafdc4"},
+    {file = "regex-2021.11.10-cp310-cp310-musllinux_1_1_aarch64.whl", hash = "sha256:b9ed0b1e5e0759d6b7f8e2f143894b2a7f3edd313f38cf44e1e15d360e11749b"},
+    {file = "regex-2021.11.10-cp310-cp310-musllinux_1_1_i686.whl", hash = "sha256:473e67837f786404570eae33c3b64a4b9635ae9f00145250851a1292f484c063"},
+    {file = "regex-2021.11.10-cp310-cp310-musllinux_1_1_ppc64le.whl", hash = "sha256:2fee3ed82a011184807d2127f1733b4f6b2ff6ec7151d83ef3477f3b96a13d03"},
+    {file = "regex-2021.11.10-cp310-cp310-musllinux_1_1_s390x.whl", hash = "sha256:d5fd67df77bab0d3f4ea1d7afca9ef15c2ee35dfb348c7b57ffb9782a6e4db6e"},
+    {file = "regex-2021.11.10-cp310-cp310-musllinux_1_1_x86_64.whl", hash = "sha256:5d408a642a5484b9b4d11dea15a489ea0928c7e410c7525cd892f4d04f2f617b"},
     {file = "regex-2021.11.10-cp310-cp310-win32.whl", hash = "sha256:98ba568e8ae26beb726aeea2273053c717641933836568c2a0278a84987b2a1a"},
     {file = "regex-2021.11.10-cp310-cp310-win_amd64.whl", hash = "sha256:780b48456a0f0ba4d390e8b5f7c661fdd218934388cde1a974010a965e200e12"},
     {file = "regex-2021.11.10-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:dba70f30fd81f8ce6d32ddeef37d91c8948e5d5a4c63242d16a2b2df8143aafc"},
@@ -1775,6 +1781,11 @@ regex = [
     {file = "regex-2021.11.10-cp36-cp36m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:5537f71b6d646f7f5f340562ec4c77b6e1c915f8baae822ea0b7e46c1f09b733"},
     {file = "regex-2021.11.10-cp36-cp36m-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:ed2e07c6a26ed4bea91b897ee2b0835c21716d9a469a96c3e878dc5f8c55bb23"},
     {file = "regex-2021.11.10-cp36-cp36m-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:ca5f18a75e1256ce07494e245cdb146f5a9267d3c702ebf9b65c7f8bd843431e"},
+    {file = "regex-2021.11.10-cp36-cp36m-musllinux_1_1_aarch64.whl", hash = "sha256:74cbeac0451f27d4f50e6e8a8f3a52ca074b5e2da9f7b505c4201a57a8ed6286"},
+    {file = "regex-2021.11.10-cp36-cp36m-musllinux_1_1_i686.whl", hash = "sha256:3598893bde43091ee5ca0a6ad20f08a0435e93a69255eeb5f81b85e81e329264"},
+    {file = "regex-2021.11.10-cp36-cp36m-musllinux_1_1_ppc64le.whl", hash = "sha256:50a7ddf3d131dc5633dccdb51417e2d1910d25cbcf842115a3a5893509140a3a"},
+    {file = "regex-2021.11.10-cp36-cp36m-musllinux_1_1_s390x.whl", hash = "sha256:61600a7ca4bcf78a96a68a27c2ae9389763b5b94b63943d5158f2a377e09d29a"},
+    {file = "regex-2021.11.10-cp36-cp36m-musllinux_1_1_x86_64.whl", hash = "sha256:563d5f9354e15e048465061509403f68424fef37d5add3064038c2511c8f5e00"},
     {file = "regex-2021.11.10-cp36-cp36m-win32.whl", hash = "sha256:93a5051fcf5fad72de73b96f07d30bc29665697fb8ecdfbc474f3452c78adcf4"},
     {file = "regex-2021.11.10-cp36-cp36m-win_amd64.whl", hash = "sha256:b483c9d00a565633c87abd0aaf27eb5016de23fed952e054ecc19ce32f6a9e7e"},
     {file = "regex-2021.11.10-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:fff55f3ce50a3ff63ec8e2a8d3dd924f1941b250b0aac3d3d42b687eeff07a8e"},
@@ -1784,6 +1795,11 @@ regex = [
     {file = "regex-2021.11.10-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:d5ca078bb666c4a9d1287a379fe617a6dccd18c3e8a7e6c7e1eb8974330c626a"},
     {file = "regex-2021.11.10-cp37-cp37m-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:dd33eb9bdcfbabab3459c9ee651d94c842bc8a05fabc95edf4ee0c15a072495e"},
     {file = "regex-2021.11.10-cp37-cp37m-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:05b7d6d7e64efe309972adab77fc2af8907bb93217ec60aa9fe12a0dad35874f"},
+    {file = "regex-2021.11.10-cp37-cp37m-musllinux_1_1_aarch64.whl", hash = "sha256:42b50fa6666b0d50c30a990527127334d6b96dd969011e843e726a64011485da"},
+    {file = "regex-2021.11.10-cp37-cp37m-musllinux_1_1_i686.whl", hash = "sha256:6e1d2cc79e8dae442b3fa4a26c5794428b98f81389af90623ffcc650ce9f6732"},
+    {file = "regex-2021.11.10-cp37-cp37m-musllinux_1_1_ppc64le.whl", hash = "sha256:0416f7399e918c4b0e074a0f66e5191077ee2ca32a0f99d4c187a62beb47aa05"},
+    {file = "regex-2021.11.10-cp37-cp37m-musllinux_1_1_s390x.whl", hash = "sha256:ce298e3d0c65bd03fa65ffcc6db0e2b578e8f626d468db64fdf8457731052942"},
+    {file = "regex-2021.11.10-cp37-cp37m-musllinux_1_1_x86_64.whl", hash = "sha256:dc07f021ee80510f3cd3af2cad5b6a3b3a10b057521d9e6aaeb621730d320c5a"},
     {file = "regex-2021.11.10-cp37-cp37m-win32.whl", hash = "sha256:e71255ba42567d34a13c03968736c5d39bb4a97ce98188fafb27ce981115beec"},
     {file = "regex-2021.11.10-cp37-cp37m-win_amd64.whl", hash = "sha256:07856afef5ffcc052e7eccf3213317fbb94e4a5cd8177a2caa69c980657b3cb4"},
     {file = "regex-2021.11.10-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:ba05430e819e58544e840a68b03b28b6d328aff2e41579037e8bab7653b37d83"},
@@ -1794,6 +1810,11 @@ regex = [
     {file = "regex-2021.11.10-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:85bfa6a5413be0ee6c5c4a663668a2cad2cbecdee367630d097d7823041bdeec"},
     {file = "regex-2021.11.10-cp38-cp38-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:f23222527b307970e383433daec128d769ff778d9b29343fb3496472dc20dabe"},
     {file = "regex-2021.11.10-cp38-cp38-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:da1a90c1ddb7531b1d5ff1e171b4ee61f6345119be7351104b67ff413843fe94"},
+    {file = "regex-2021.11.10-cp38-cp38-musllinux_1_1_aarch64.whl", hash = "sha256:f5be7805e53dafe94d295399cfbe5227f39995a997f4fd8539bf3cbdc8f47ca8"},
+    {file = "regex-2021.11.10-cp38-cp38-musllinux_1_1_i686.whl", hash = "sha256:a955b747d620a50408b7fdf948e04359d6e762ff8a85f5775d907ceced715129"},
+    {file = "regex-2021.11.10-cp38-cp38-musllinux_1_1_ppc64le.whl", hash = "sha256:139a23d1f5d30db2cc6c7fd9c6d6497872a672db22c4ae1910be22d4f4b2068a"},
+    {file = "regex-2021.11.10-cp38-cp38-musllinux_1_1_s390x.whl", hash = "sha256:ca49e1ab99593438b204e00f3970e7a5f70d045267051dfa6b5f4304fcfa1dbf"},
+    {file = "regex-2021.11.10-cp38-cp38-musllinux_1_1_x86_64.whl", hash = "sha256:96fc32c16ea6d60d3ca7f63397bff5c75c5a562f7db6dec7d412f7c4d2e78ec0"},
     {file = "regex-2021.11.10-cp38-cp38-win32.whl", hash = "sha256:0617383e2fe465732af4509e61648b77cbe3aee68b6ac8c0b6fe934db90be5cc"},
     {file = "regex-2021.11.10-cp38-cp38-win_amd64.whl", hash = "sha256:a3feefd5e95871872673b08636f96b61ebef62971eab044f5124fb4dea39919d"},
     {file = "regex-2021.11.10-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:f7f325be2804246a75a4f45c72d4ce80d2443ab815063cdf70ee8fb2ca59ee1b"},
@@ -1804,6 +1825,11 @@ regex = [
     {file = "regex-2021.11.10-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:962b9a917dd7ceacbe5cd424556914cb0d636001e393b43dc886ba31d2a1e449"},
     {file = "regex-2021.11.10-cp39-cp39-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:fa8c626d6441e2d04b6ee703ef2d1e17608ad44c7cb75258c09dd42bacdfc64b"},
     {file = "regex-2021.11.10-cp39-cp39-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:3c5fb32cc6077abad3bbf0323067636d93307c9fa93e072771cf9a64d1c0f3ef"},
+    {file = "regex-2021.11.10-cp39-cp39-musllinux_1_1_aarch64.whl", hash = "sha256:cd410a1cbb2d297c67d8521759ab2ee3f1d66206d2e4328502a487589a2cb21b"},
+    {file = "regex-2021.11.10-cp39-cp39-musllinux_1_1_i686.whl", hash = "sha256:e6096b0688e6e14af6a1b10eaad86b4ff17935c49aa774eac7c95a57a4e8c296"},
+    {file = "regex-2021.11.10-cp39-cp39-musllinux_1_1_ppc64le.whl", hash = "sha256:529801a0d58809b60b3531ee804d3e3be4b412c94b5d267daa3de7fadef00f49"},
+    {file = "regex-2021.11.10-cp39-cp39-musllinux_1_1_s390x.whl", hash = "sha256:0f594b96fe2e0821d026365f72ac7b4f0b487487fb3d4aaf10dd9d97d88a9737"},
+    {file = "regex-2021.11.10-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:2409b5c9cef7054dde93a9803156b411b677affc84fca69e908b1cb2c540025d"},
     {file = "regex-2021.11.10-cp39-cp39-win32.whl", hash = "sha256:3b5df18db1fccd66de15aa59c41e4f853b5df7550723d26aa6cb7f40e5d9da5a"},
     {file = "regex-2021.11.10-cp39-cp39-win_amd64.whl", hash = "sha256:83ee89483672b11f8952b158640d0c0ff02dc43d9cb1b70c1564b49abe92ce29"},
     {file = "regex-2021.11.10.tar.gz", hash = "sha256:f341ee2df0999bfdf7a95e448075effe0db212a59387de1a70690e4acb03d4c6"},
@@ -1927,50 +1953,56 @@ typing-extensions = [
     {file = "typing_extensions-4.0.0.tar.gz", hash = "sha256:2cdf80e4e04866a9b3689a51869016d36db0814d84b8d8a568d22781d45d27ed"},
 ]
 ujson = [
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-    {file = "ujson-4.3.0-cp310-cp310-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:5d1083a0dcb39b43cfcd948f09e480c23eb4af66d7d08f6b36951f4c629c3bd1"},
-    {file = "ujson-4.3.0-cp310-cp310-musllinux_1_1_aarch64.whl", hash = "sha256:01d12df8eb25afb939a003284b5b5adca9788c1176c445641e5980fa892562ac"},
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-    {file = "ujson-4.3.0-cp310-cp310-win32.whl", hash = "sha256:3d8eaab72ad8129c12ed90ebf310230bd014b6bbf99145ebf2bc890238e0254f"},
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-    {file = "ujson-4.3.0-cp36-cp36m-win_amd64.whl", hash = "sha256:1601354caaab0697a9b24815a31611ad013d29cf957d545fc1cd59835b82e3c1"},
-    {file = "ujson-4.3.0-cp37-cp37m-macosx_10_14_x86_64.whl", hash = "sha256:b80a35bad8fad1772f992bae8086b0cde788cd3b37f35d0d4506c93e6edad645"},
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-    {file = "ujson-4.3.0-cp37-cp37m-musllinux_1_1_aarch64.whl", hash = "sha256:fd0901db652a58f46550074596227dbddb7a02d2de744d3cd2358101f78037bb"},
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-    {file = "ujson-4.3.0-cp37-cp37m-win32.whl", hash = "sha256:b0e9510e867c72a87db2d16377c2bef912f29afd8381d1fdae332b9b7f697efa"},
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diff --git a/pyproject.toml b/pyproject.toml
index feebf0b..fef7045 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ aio-statsd = "0.2.7"
 pydantic = {version = "^1.8.2", optional = true }
 environs = {version = "^9.3.1", optional = true }
 ojson = {version = "^0.1.0", optional = true }
-ujson = {version = "^4.0.2", optional = true }
+ujson = {version = ">=4.0.2,<6.0.0", optional = true }
 PyYAML = "^5.4.1"
 opentracing = { version = "^2.4.0", optional = true }
 apache-skywalking = { version = "^0.7.0", optional = true}