diff --git a/Cargo.lock b/Cargo.lock
index e53e5c4..33d575f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,15 +4,15 @@ version = 3
 
 [[package]]
 name = "bitflags"
-version = "2.5.0"
+version = "2.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf4b9d6a944f767f8e5e0db018570623c85f3d925ac718db4e06d0187adb21c1"
+checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
 
 [[package]]
 name = "cc"
-version = "1.0.98"
+version = "1.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41c270e7540d725e65ac7f1b212ac8ce349719624d7bcff99f8e2e488e8cf03f"
+checksum = "324c74f2155653c90b04f25b2a47a8a631360cb908f92a772695f430c7e31052"
 
 [[package]]
 name = "equivalent"
@@ -77,9 +77,9 @@ dependencies = [
 
 [[package]]
 name = "memchr"
-version = "2.7.2"
+version = "2.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c8640c5d730cb13ebd907d8d04b52f55ac9a2eec55b440c8892f40d56c76c1d"
+checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
 [[package]]
 name = "num_enum"
@@ -113,9 +113,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.84"
+version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec96c6a92621310b51366f1e28d05ef11489516e93be030060e5fc12024a49d6"
+checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
 dependencies = [
  "unicode-ident",
 ]
@@ -131,9 +131,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.66"
+version = "2.0.71"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c42f3f41a2de00b01c0aaad383c5a45241efc8b2d1eda5661812fda5f3cdcff5"
+checksum = "b146dcf730474b4bcd16c311627b31ede9ab149045db4d6088b3becaea046462"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -142,18 +142,18 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.61"
+version = "1.0.62"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c546c80d6be4bc6a00c0f01730c08df82eaa7a7a61f11d656526506112cc1709"
+checksum = "f2675633b1499176c2dff06b0856a27976a8f9d436737b4cf4f312d4d91d8bbb"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.61"
+version = "1.0.62"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "46c3384250002a6d5af4d114f2845d37b57521033f30d5c3f46c4d70e1197533"
+checksum = "d20468752b09f49e909e55a5d338caa8bedf615594e9d80bc4c565d30faf798c"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/libcsp-sys/src/lib.rs b/libcsp-sys/src/lib.rs
index 515ad60..a4a9e7c 100644
--- a/libcsp-sys/src/lib.rs
+++ b/libcsp-sys/src/lib.rs
@@ -483,7 +483,7 @@ extern "C" {
     pub fn csp_buffer_get(unused: usize) -> *mut csp_packet_t;
 
     #[doc = " Free buffer (from task context).\n\n @param[in] buffer buffer to free. NULL is handled gracefully."]
-    pub fn csp_buffer_free(buffer: *mut ::core::ffi::c_void);
+    pub fn csp_buffer_free(buffer: *const ::core::ffi::c_void);
 
     #[doc = " Print connection table to stdout."]
     pub fn csp_conn_print_table();
diff --git a/src/lib.rs b/src/lib.rs
index 44e9b30..a79a879 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -604,7 +604,7 @@ pub fn csp_conn_print_table() {
 pub fn csp_buffer_free(packet: impl Into<CspPacketRef>) {
     // SAFETY: FFI call and the Rust type system actually ensure the correct type
     // is free'd here, while also taking the packet by value.
-    unsafe { ffi::csp_buffer_free(packet.into().0 as *mut libc::c_void) }
+    unsafe { ffi::csp_buffer_free(packet.into().0 as *const libc::c_void) }
 }
 
 /// Rust wrapper for [ffi::csp_transaction_persistent].