diff --git a/Cargo.lock b/Cargo.lock
index 56d696885..e1e5d88c5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -480,7 +480,7 @@ version = "0.71.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5f58bf3d7db68cfbac37cfc485a8d711e87e064c3d0fe0435b92f7a407f9d6b3"
 dependencies = [
- "bitflags 2.9.0",
+ "bitflags",
  "cexpr",
  "clang-sys",
  "itertools",
@@ -500,7 +500,7 @@ version = "0.72.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "993776b509cfb49c750f11b8f07a46fa23e0a1386ffc01fb1e7d343efc387895"
 dependencies = [
- "bitflags 2.9.0",
+ "bitflags",
  "cexpr",
  "clang-sys",
  "itertools",
@@ -514,12 +514,6 @@ dependencies = [
  "syn 2.0.101",
 ]
 
-[[package]]
-name = "bitflags"
-version = "1.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
-
 [[package]]
 name = "bitflags"
 version = "2.9.0"
@@ -790,7 +784,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9d4ddf7139e64dc916b11d434421031bcc5ba02e521a49a011652a0f68775188"
 dependencies = [
  "anyhow",
- "bitflags 2.9.0",
+ "bitflags",
  "bytes",
  "libgssapi",
  "windows",
@@ -1680,7 +1674,7 @@ version = "0.7.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "046fa2d4d00aea763528b4950358d0ead425372445dc8ff86312b3c69ff7727b"
 dependencies = [
- "bitflags 2.9.0",
+ "bitflags",
  "cfg-if",
  "libc",
 ]
@@ -1798,7 +1792,7 @@ version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "834339e86b2561169d45d3b01741967fee3e5716c7d0b6e33cd4e3b34c9558cd"
 dependencies = [
- "bitflags 2.9.0",
+ "bitflags",
  "bytes",
  "lazy_static",
  "libgssapi-sys",
@@ -2003,7 +1997,7 @@ dependencies = [
  "aws-sigv4",
  "backtrace",
  "base64 0.13.1",
- "bitflags 1.3.2",
+ "bitflags",
  "bson 2.15.0",
  "bson 3.0.0",
  "chrono",
@@ -2169,7 +2163,7 @@ version = "0.10.73"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8505734d46c8ab1e19a1dce3aef597ad87dcb4c37e7188231769bd6bd51cebf8"
 dependencies = [
- "bitflags 2.9.0",
+ "bitflags",
  "cfg-if",
  "foreign-types",
  "libc",
@@ -2561,7 +2555,7 @@ version = "0.5.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed2bf2547551a7053d6fdfafda3f938979645c44812fbfcda098faae3f1a362d"
 dependencies = [
- "bitflags 2.9.0",
+ "bitflags",
 ]
 
 [[package]]
@@ -2700,7 +2694,7 @@ version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cd15f8a2c5551a84d56efdc1cd049089e409ac19a3072d5037a17fd70719ff3e"
 dependencies = [
- "bitflags 2.9.0",
+ "bitflags",
  "errno",
  "libc",
  "linux-raw-sys",
@@ -2810,7 +2804,7 @@ version = "2.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "897b2245f0b511c87893af39b033e5ca9cce68824c4d7e7630b5a1d339658d02"
 dependencies = [
- "bitflags 2.9.0",
+ "bitflags",
  "core-foundation 0.9.4",
  "core-foundation-sys",
  "libc",
@@ -2823,7 +2817,7 @@ version = "3.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "271720403f46ca04f7ba6f55d438f8bd878d6b8ca0a1046e8228c4145bcbb316"
 dependencies = [
- "bitflags 2.9.0",
+ "bitflags",
  "core-foundation 0.10.1",
  "core-foundation-sys",
  "libc",
@@ -3139,7 +3133,7 @@ version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3c879d448e9d986b661742763247d3693ed13609438cf3d006f51f5368a5ba6b"
 dependencies = [
- "bitflags 2.9.0",
+ "bitflags",
  "core-foundation 0.9.4",
  "system-configuration-sys",
 ]
@@ -3416,7 +3410,7 @@ version = "0.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "adc82fd73de2a9722ac5da747f12383d2bfdb93591ee6c58486e0097890f05f2"
 dependencies = [
- "bitflags 2.9.0",
+ "bitflags",
  "bytes",
  "futures-util",
  "http 1.3.1",
@@ -4096,7 +4090,7 @@ version = "0.39.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6f42320e61fe2cfd34354ecb597f86f413484a798ba44a8ca1165c58d42da6c1"
 dependencies = [
- "bitflags 2.9.0",
+ "bitflags",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index b3a6c675f..18d629b74 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -80,7 +80,7 @@ text-indexes-unstable = []
 
 [dependencies]
 base64 = "0.13.0"
-bitflags = "1.1.0"
+bitflags = "2"
 chrono = { version = "0.4.7", default-features = false, features = [
     "clock",
     "std",
diff --git a/src/cmap/conn/wire/message.rs b/src/cmap/conn/wire/message.rs
index 84388e653..1bcfc815b 100644
--- a/src/cmap/conn/wire/message.rs
+++ b/src/cmap/conn/wire/message.rs
@@ -407,6 +407,7 @@ const DEFAULT_MAX_MESSAGE_SIZE_BYTES: i32 = 48 * 1024 * 1024;
 
 bitflags! {
     /// Represents the bitwise flags for an OP_MSG as defined in the spec.
+    #[derive(Debug)]
     pub(crate) struct MessageFlags: u32 {
         const CHECKSUM_PRESENT = 0b_0000_0000_0000_0000_0000_0000_0000_0001;
         const MORE_TO_COME     = 0b_0000_0000_0000_0000_0000_0000_0000_0010;