diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 00971a6ac4..99ba122d2d 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -25,8 +25,9 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-14, windows-latest]
         # Don't increase beyond what Firefox is currently using:
-        # https://firefox-source-docs.mozilla.org/writing-rust-code/update-policy.html#schedule
-        rust-toolchain: [1.74.0, stable, nightly]
+        # https://searchfox.org/mozilla-central/search?q=MINIMUM_RUST_VERSION&path=python/mozboot/mozboot/util.py
+        # Keep in sync with Cargo.toml
+        rust-toolchain: [1.76.0, stable, nightly]
         type: [debug]
         include:
           - os: ubuntu-latest
diff --git a/Cargo.toml b/Cargo.toml
index 017918b88c..4be3ba5ad4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,7 +21,8 @@ edition = "2021"
 license = "MIT OR Apache-2.0"
 # Don't increase beyond what Firefox is currently using:
 # https://searchfox.org/mozilla-central/search?q=MINIMUM_RUST_VERSION&path=python/mozboot/mozboot/util.py
-rust-version = "1.74.0"
+# Keep in sync with .github/workflows/check.yml
+rust-version = "1.76.0"
 
 [workspace.dependencies]
 log = { version = "0.4", default-features = false }
diff --git a/neqo-crypto/src/agentio.rs b/neqo-crypto/src/agentio.rs
index 7c57a0ef45..3beede5c12 100644
--- a/neqo-crypto/src/agentio.rs
+++ b/neqo-crypto/src/agentio.rs
@@ -29,7 +29,7 @@ const PR_FAILURE: PrStatus = prio::PRStatus::PR_FAILURE;
 
 /// Convert a pinned, boxed object into a void pointer.
 pub fn as_c_void<T: Unpin>(pin: &mut Pin<Box<T>>) -> *mut c_void {
-    (Pin::into_inner(pin.as_mut()) as *mut T).cast()
+    (std::ptr::from_mut::<T>(Pin::into_inner(pin.as_mut()))).cast()
 }
 
 /// A slice of the output.