diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 583184e..f19cbd8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,19 +12,25 @@ jobs:
     name: OTP ${{matrix.otp}} / rebar3 ${{matrix.rebar3}} / OS ${{matrix.os}}
     strategy:
       matrix:
-        os: ['ubuntu-22.04']
-        otp: ['26.1', '25.3', '24.3']
-        rebar3: ['3.22.1']
+        os: ['ubuntu-24.04']
+        otp: ['27', '26', '25']
+        rebar3: ['3.24.0']
         include:
-          - otp: '26.1'
+          - otp: '23'
+            rebar3: '3.20.0'
+            os: 'ubuntu-20.04'
+          - otp: '24'
             rebar3: '3.22.1'
+            os: 'ubuntu-22.04'
+          - otp: '27'
+            rebar3: '3.24.0'
             os: 'windows-2022'
-          - otp: '26.1'
-            rebar3: '3.22.1'
+          - otp: '27'
+            rebar3: '3.24.0'
             os: 'macos-latest'
     runs-on: ${{matrix.os}}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # OS setups
       - name: Ubuntu/Windows – Prepare Erlang
@@ -56,12 +62,12 @@ jobs:
 
       # caches
       - name: Restore _build
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: _build
           key: _build-cache-for-os-${{matrix.os}}-otp-${{matrix.otp}}-rebar3-${{matrix.rebar3}}-hash-${{hashFiles('rebar.lock')}}
       - name: Restore rebar3's cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.cache/rebar3
           key: rebar3-cache-for-os-${{matrix.os}}-otp-${{matrix.otp}}-rebar3-${{matrix.rebar3}}-hash-${{hashFiles('rebar.lock')}}
@@ -71,27 +77,27 @@ jobs:
       - run: rebar3 as test compile
       - run: rebar3 as test ct
       - run: rebar3 dialyzer
-        if: ${{ matrix.otp == '26.1' && matrix.os == 'ubuntu-22.04' }}
+        if: ${{ matrix.otp == '27' && matrix.os == 'ubuntu-24.04' }}
       - name: Run coverage
-        if: ${{ matrix.otp == '26.1' && matrix.os == 'ubuntu-22.04' }}
+        if: ${{ matrix.otp == '27' && matrix.os == 'ubuntu-24.04' }}
         run: |
           rebar3 as test codecov analyze
           gcov -o c_src fast_pbkdf2
-      - name: Upload coverage
-        if: ${{ matrix.otp == '26.1' && matrix.os == 'ubuntu-22.04' }}
-        run: |
-          pip install --user codecov
-          /home/runner/.local/bin/codecov
+      - name: Upload coverage reports to Codecov
+        if: ${{ matrix.otp == '27' && matrix.os == 'ubuntu-24.04' }}
+        uses: codecov/codecov-action@v4
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
   test-on-s390x:
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Setup emulator
       run: |
         sudo docker run --rm --privileged tonistiigi/binfmt:qemu-v6.2.0
     - name: Run build
-      uses: uraimo/run-on-arch-action@v2.6.0
+      uses: uraimo/run-on-arch-action@v2.7.2
       with:
         arch: s390x
         distro: ubuntu22.04
diff --git a/rebar.config b/rebar.config
index cc5e2da..bf4299b 100644
--- a/rebar.config
+++ b/rebar.config
@@ -11,8 +11,10 @@
       {base16, "2.0.1"},
       {proper, "1.4.0"}
     ]},
+    {cover_enabled, true},
+    {cover_export_enabled, true},
     {plugins, [
-      {rebar3_codecov, "0.6.0"}]},
+      {rebar3_codecov, "0.7.0"}]},
       {port_env,
         [
           {"(linux|solaris|freebsd|netbsd|openbsd|dragonfly|darwin|gnu)",
@@ -60,9 +62,6 @@
       ]}
   ]}.
 
-{cover_enabled, true}.
-{cover_export_enabled, true}.
-
 {project_plugins, [
     rebar3_hex,
     rebar3_ex_doc
diff --git a/src/fast_pbkdf2.erl b/src/fast_pbkdf2.erl
index 4583314..20b3669 100644
--- a/src/fast_pbkdf2.erl
+++ b/src/fast_pbkdf2.erl
@@ -6,16 +6,14 @@
 -export([pbkdf2/4, pbkdf2/5]).
 
 %%% @doc
-%%% This function calculates the pbkdf2 algorithm where dkLen is simply assumed to be that of the
-%%% underlying hash function, a sane default.
-%%% @end
+%%% This function calculates the pbkdf2 algorithm where dkLen is simply assumed to be that
+%%% of the underlying hash function, a sane default.
 -spec pbkdf2(sha_type(), binary(), binary(), non_neg_integer()) -> binary().
 pbkdf2(Hash, Password, Salt, IterationCount) ->
     pbkdf2_block(Hash, Password, Salt, IterationCount, 1).
 
 %%% @doc
 %%% This function allows to customise the desired dkLen parameter for pbkdf2.
-%%% @end
 -spec pbkdf2(sha_type(), binary(), binary(), non_neg_integer(), non_neg_integer()) -> binary().
 pbkdf2(Hash, Password, Salt, IterationCount, DkLen) ->
     pbkdf2(Hash, Password, Salt, IterationCount, DkLen, 1, [], 0).