diff --git a/.github/workflows/cargo_llvm_cov.yml b/.github/workflows/cargo_llvm_cov.yml
index 1508a286f4a..a140f2c64e0 100644
--- a/.github/workflows/cargo_llvm_cov.yml
+++ b/.github/workflows/cargo_llvm_cov.yml
@@ -57,7 +57,7 @@ jobs:
       - name: Generate code coverage report (nextest.info)
         run: |
           cargo llvm-cov clean
-          LLVM_PROFDATA="$HOME/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-profdata"
+          LLVM_PROFDATA="$HOME/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-profdata"
           if [[ -x "$LLVM_PROFDATA" ]]; then
             $LLVM_PROFDATA --version
           else
@@ -65,7 +65,7 @@ jobs:
             exit 1
           fi
           set +e
-          IOTA_SKIP_SIMTESTS=1 cargo llvm-cov --ignore-run-fail --no-report nextest -vv
+          IOTA_SKIP_SIMTESTS=1 cargo +nightly llvm-cov --ignore-run-fail --no-report nextest -vv
           find target/llvm-cov-target -name '*.profraw' | while read file; do
             if ! $LLVM_PROFDATA show "$file" > /dev/null 2>&1; then
                 echo "Removing corrupted file: $file"
diff --git a/scripts/simtest/simtest-cov.sh b/scripts/simtest/simtest-cov.sh
index 477270cfa16..9f2f86788a5 100755
--- a/scripts/simtest/simtest-cov.sh
+++ b/scripts/simtest/simtest-cov.sh
@@ -19,7 +19,7 @@ export SIMTEST_STATIC_INIT_MOVE=$root_dir"/examples/move/basics"
 # MSIM_WATCHDOG_TIMEOUT_MS=60000 MSIM_TEST_SEED=1 cargo +nightly llvm-cov --ignore-run-fail --branch --lcov --output-path simtest.info \
 #   nextest -vv --cargo-profile simulator
 
-MSIM_WATCHDOG_TIMEOUT_MS=60000 MSIM_TEST_SEED=1 cargo llvm-cov --ignore-run-fail --no-report nextest -vv --cargo-profile simulator
+MSIM_WATCHDOG_TIMEOUT_MS=60000 MSIM_TEST_SEED=1 cargo +nightly llvm-cov --ignore-run-fail --no-report nextest -vv --cargo-profile simulator
 
 find target/llvm-cov-target -name '*.profraw' | while read file; do
   if ! "$HOME/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-profdata" show "$file" > /dev/null 2>&1; then
@@ -28,7 +28,7 @@ find target/llvm-cov-target -name '*.profraw' | while read file; do
   fi
 done 
 
-cargo llvm-cov report --lcov --output-path target/llvm-cov/simtest.info
+cargo +nightly llvm-cov report --lcov --output-path target/llvm-cov/simtest.info
 
 # remove the patch
 git checkout .cargo/config Cargo.toml Cargo.lock