diff --git a/dictsqlite_v2/dictsqlite/Cargo.lock b/dictsqlite_v2/dictsqlite/Cargo.lock
index bc0d930c..e8159217 100644
--- a/dictsqlite_v2/dictsqlite/Cargo.lock
+++ b/dictsqlite_v2/dictsqlite/Cargo.lock
@@ -618,15 +618,6 @@ dependencies = [
  "digest",
 ]
 
-[[package]]
-name = "indoc"
-version = "2.0.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "79cf5c93f93228cf8efb3ba362535fb11199ac548a09ce117c9b1adc3030d706"
-dependencies = [
- "rustversion",
-]
-
 [[package]]
 name = "inout"
 version = "0.1.4"
@@ -730,15 +721,6 @@ version = "2.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f52b00d39961fc5b2736ea853c9cc86238e165017a493d1d5c8eac6bdc4cc273"
 
-[[package]]
-name = "memoffset"
-version = "0.9.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "488016bfae457b036d996092f6cb448677611ce4449e970ceaf42695203f218a"
-dependencies = [
- "autocfg",
-]
-
 [[package]]
 name = "mio"
 version = "1.1.1"
@@ -959,35 +941,32 @@ dependencies = [
 
 [[package]]
 name = "pyo3"
-version = "0.27.2"
+version = "0.28.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab53c047fcd1a1d2a8820fe84f05d6be69e9526be40cb03b73f86b6b03e6d87d"
+checksum = "cf85e27e86080aafd5a22eae58a162e133a589551542b3e5cee4beb27e54f8e1"
 dependencies = [
- "indoc",
  "libc",
- "memoffset",
  "once_cell",
  "portable-atomic",
  "pyo3-build-config",
  "pyo3-ffi",
  "pyo3-macros",
- "unindent",
 ]
 
 [[package]]
 name = "pyo3-build-config"
-version = "0.27.2"
+version = "0.28.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b455933107de8642b4487ed26d912c2d899dec6114884214a0b3bb3be9261ea6"
+checksum = "8bf94ee265674bf76c09fa430b0e99c26e319c945d96ca0d5a8215f31bf81cf7"
 dependencies = [
  "target-lexicon",
 ]
 
 [[package]]
 name = "pyo3-ffi"
-version = "0.27.2"
+version = "0.28.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1c85c9cbfaddf651b1221594209aed57e9e5cff63c4d11d1feead529b872a089"
+checksum = "491aa5fc66d8059dd44a75f4580a2962c1862a1c2945359db36f6c2818b748dc"
 dependencies = [
  "libc",
  "pyo3-build-config",
@@ -995,9 +974,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-macros"
-version = "0.27.2"
+version = "0.28.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0a5b10c9bf9888125d917fb4d2ca2d25c8df94c7ab5a52e13313a07e050a3b02"
+checksum = "f5d671734e9d7a43449f8480f8b38115df67bef8d21f76837fa75ee7aaa5e52e"
 dependencies = [
  "proc-macro2",
  "pyo3-macros-backend",
@@ -1007,9 +986,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-macros-backend"
-version = "0.27.2"
+version = "0.28.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03b51720d314836e53327f5871d4c0cfb4fb37cc2c4a11cc71907a86342c40f9"
+checksum = "22faaa1ce6c430a1f71658760497291065e6450d7b5dc2bcf254d49f66ee700a"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -1020,9 +999,9 @@ dependencies = [
 
 [[package]]
 name = "pythonize"
-version = "0.27.0"
+version = "0.28.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a3a8f29db331e28c332c63496cfcbb822aca3d7320bc08b655d7fd0c29c50ede"
+checksum = "0b79f670c9626c8b651c0581011b57b6ba6970bb69faf01a7c4c0cfc81c43f95"
 dependencies = [
  "pyo3",
  "serde",
@@ -1570,12 +1549,6 @@ version = "1.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9312f7c4f6ff9069b165498234ce8be658059c6728633667c526e27dc2cf1df5"
 
-[[package]]
-name = "unindent"
-version = "0.2.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7264e107f553ccae879d21fbea1d6724ac785e8c3bfc762137959b5802826ef3"
-
 [[package]]
 name = "universal-hash"
 version = "0.5.1"
diff --git a/dictsqlite_v2/dictsqlite/Cargo.toml b/dictsqlite_v2/dictsqlite/Cargo.toml
index 6207676f..b441d02c 100644
--- a/dictsqlite_v2/dictsqlite/Cargo.toml
+++ b/dictsqlite_v2/dictsqlite/Cargo.toml
@@ -11,8 +11,8 @@ name = "dictsqlite"
 crate-type = ["cdylib", "rlib"]
 
 [dependencies]
-# Python bindings (v5.1 update: PyO3 0.27 with improved FromPyObject performance)
-pyo3 = { version = "0.27.2", features = ["extension-module", "abi3-py39", "experimental-async"] }
+# Python bindings (updated: PyO3 0.28 with improved FromPyObject performance)
+pyo3 = { version = "0.28", features = ["extension-module", "abi3-py39", "experimental-async"] }
 
 # High-performance concurrent data structures (v5.1 update: dashmap 6.1 for better perf)
 dashmap = "6.1"          # Lock-free concurrent HashMap
@@ -32,7 +32,7 @@ async-trait = "0.1"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 rmp-serde = "1.1"  # MessagePack for JSONB mode
-pythonize = "0.28"       # Fast Python <-> Rust JSON conversion (v5.1: pyo3 0.27 compat)
+pythonize = "0.28"       # Fast Python <-> Rust JSON conversion (pyo3 0.28 compat)
 
 # Compression (v5 optimization)
 zstd = "0.13"            # High-speed compression