diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 29f29ab..50104bd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
 
 env:
-  NIGHTLY_TOOLCHAIN: nightly-2025-09-15
+  NIGHTLY_TOOLCHAIN: nightly-2026-01-05
 
 jobs:
   check:
@@ -94,14 +94,16 @@ jobs:
             --release \
             --target="$TOOLS_TARGET"
 
+          CARGO_PROFILE_RELEASE_TINY_PANIC=immediate-abort \
           cargo +"$NIGHTLY_TOOLCHAIN" build \
             --all \
             --bin brioche-packed-plain-exec \
             --bin brioche-packed-userland-exec \
             --profile=release-tiny \
             --target="$TOOLS_TARGET" \
+            -Z panic-immediate-abort \
             -Z 'build-std=std,panic_abort' \
-            -Z 'build-std-features=panic_immediate_abort'
+            -Z 'build-std-features=optimize_for_size'
         env:
           TOOLS_TARGET: ${{ matrix.tools-target }}
           CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_LINKER: aarch64-linux-gnu-gcc