diff --git a/fuzzers/aflrustrust/builder.Dockerfile b/fuzzers/aflrustrust/builder.Dockerfile
index 7835c03b7..ccc7afc4f 100644
--- a/fuzzers/aflrustrust/builder.Dockerfile
+++ b/fuzzers/aflrustrust/builder.Dockerfile
@@ -24,7 +24,7 @@ RUN apt-get update && \
 # Uninstall old Rust & Install the latest one.
 RUN if which rustup; then rustup self uninstall -y; fi && \
     curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs > /rustup.sh && \
-    sh /rustup.sh --default-toolchain nightly -y && \
+    sh /rustup.sh --default-toolchain nightly-2023-09-21 -y && \
     rm /rustup.sh
 
 # Download afl++.
@@ -46,11 +46,11 @@ RUN cd /afl && \
 RUN git clone https://github.com/AFLplusplus/LibAFL /libafl
 
 # Checkout a current commit
-RUN cd /libafl && git checkout 8bffd28b4c357b315acb9cecd92cbf2b734a625a
+RUN cd /libafl && git checkout c103444396697af102dce2b936a00e93017057ba
 
 # Compile libafl.
 RUN cd /libafl && \
     unset CFLAGS CXXFLAGS && \
     cd ./fuzzers/fuzzbench_forkserver && \
-    PATH="/root/.cargo/bin/:$PATH" cargo build --release
+    PATH="/root/.cargo/bin/:$PATH" cargo build --profile release-fuzzbench
 
diff --git a/fuzzers/aflrustrust/fuzzer.py b/fuzzers/aflrustrust/fuzzer.py
index c8b66976f..81cc4b2f2 100755
--- a/fuzzers/aflrustrust/fuzzer.py
+++ b/fuzzers/aflrustrust/fuzzer.py
@@ -30,7 +30,7 @@ def build():
     # Copy to fuzzer to OUT
     build_directory = os.environ['OUT']
     fuzzer = '/libafl/fuzzers/fuzzbench_forkserver/' \
-              'target/release/fuzzbench_forkserver'
+              'target/release-fuzzbench/fuzzbench_forkserver'
     shutil.copy(fuzzer, build_directory)
 
 
diff --git a/fuzzers/libafl/builder.Dockerfile b/fuzzers/libafl/builder.Dockerfile
index f1d027780..cef4659cc 100644
--- a/fuzzers/libafl/builder.Dockerfile
+++ b/fuzzers/libafl/builder.Dockerfile
@@ -18,7 +18,7 @@ FROM $parent_image
 # Uninstall old Rust & Install the latest one.
 RUN if which rustup; then rustup self uninstall -y; fi && \
     curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs > /rustup.sh && \
-    sh /rustup.sh --default-toolchain nightly-2023-03-29 -y && \
+    sh /rustup.sh --default-toolchain nightly-2023-09-21 -y && \
     rm /rustup.sh
 
 # Install dependencies.
@@ -38,7 +38,7 @@ RUN apt-get update && \
 RUN git clone https://github.com/AFLplusplus/LibAFL /libafl
 
 # Checkout a current commit
-RUN cd /libafl && git checkout 8ff8ae41f1ed2956bb1e906c5c7bd0505ca110c0 || true
+RUN cd /libafl && git pull && git checkout b20fda2a4ada2a6462718dc661e139e6c7a29807 || true
 # Note that due a nightly bug it is currently fixed to a known version on top!
 
 # Compile libafl.
@@ -46,7 +46,7 @@ RUN cd /libafl && \
     unset CFLAGS CXXFLAGS && \
     export LIBAFL_EDGES_MAP_SIZE=2621440 && \
     cd ./fuzzers/fuzzbench && \
-    PATH="/root/.cargo/bin/:$PATH" cargo build --release --features no_link_main
+    PATH="/root/.cargo/bin/:$PATH" cargo build --profile release-fuzzbench --features no_link_main
 
 # Auxiliary weak references.
 RUN cd /libafl/fuzzers/fuzzbench && \
diff --git a/fuzzers/libafl/fuzzer.py b/fuzzers/libafl/fuzzer.py
index d00bb1dd5..cfd2a64d7 100755
--- a/fuzzers/libafl/fuzzer.py
+++ b/fuzzers/libafl/fuzzer.py
@@ -40,8 +40,10 @@ def prepare_fuzz_environment(input_corpus):
 
 def build():  # pylint: disable=too-many-branches,too-many-statements
     """Build benchmark."""
-    os.environ['CC'] = '/libafl/fuzzers/fuzzbench/target/release/libafl_cc'
-    os.environ['CXX'] = '/libafl/fuzzers/fuzzbench/target/release/libafl_cxx'
+    os.environ[
+        'CC'] = '/libafl/fuzzers/fuzzbench/target/release-fuzzbench/libafl_cc'
+    os.environ[
+        'CXX'] = '/libafl/fuzzers/fuzzbench/target/release-fuzzbench/libafl_cxx'
 
     os.environ['ASAN_OPTIONS'] = 'abort_on_error=0:allocator_may_return_null=1'
     os.environ['UBSAN_OPTIONS'] = 'abort_on_error=0'
@@ -63,5 +65,7 @@ def fuzz(input_corpus, output_corpus, target_binary):
     if dictionary_path:
         command += (['-x', dictionary_path])
     command += (['-o', output_corpus, '-i', input_corpus])
+    fuzzer_env = os.environ.copy()
+    fuzzer_env['LD_PRELOAD'] = '/usr/lib/x86_64-linux-gnu/libjemalloc.so.2'
     print(command)
-    subprocess.check_call(command, cwd=os.environ['OUT'])
+    subprocess.check_call(command, cwd=os.environ['OUT'], env=fuzzer_env)
diff --git a/fuzzers/libafl/runner.Dockerfile b/fuzzers/libafl/runner.Dockerfile
index 7aa1da8e4..f0c5eb6cc 100644
--- a/fuzzers/libafl/runner.Dockerfile
+++ b/fuzzers/libafl/runner.Dockerfile
@@ -14,6 +14,8 @@
 
 FROM gcr.io/fuzzbench/base-image
 
+RUN apt install libjemalloc2
+
 # This makes interactive docker runs painless:
 ENV LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/out"
 #ENV AFL_MAP_SIZE=2621440
diff --git a/fuzzers/libafl_forkserver/builder.Dockerfile b/fuzzers/libafl_27042023/builder.Dockerfile
similarity index 53%
rename from fuzzers/libafl_forkserver/builder.Dockerfile
rename to fuzzers/libafl_27042023/builder.Dockerfile
index d0894e72f..01141c74e 100644
--- a/fuzzers/libafl_forkserver/builder.Dockerfile
+++ b/fuzzers/libafl_27042023/builder.Dockerfile
@@ -15,42 +15,40 @@
 ARG parent_image
 FROM $parent_image
 
-# Install dependencies.
-RUN apt-get update && \
-    apt-get install -y build-essential libstdc++5 libtool-bin automake flex \
-        bison libglib2.0-dev python3-setuptools unzip python3-dev joe curl \
-        cmake git apt-utils apt-transport-https ca-certificates libdbus-1-dev
-
 # Uninstall old Rust & Install the latest one.
 RUN if which rustup; then rustup self uninstall -y; fi && \
     curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs > /rustup.sh && \
-    sh /rustup.sh --default-toolchain nightly -y && \
+    sh /rustup.sh --default-toolchain nightly-2023-03-29 -y && \
     rm /rustup.sh
 
-# Download afl++.
-RUN git clone https://github.com/AFLplusplus/AFLplusplus /afl
-
-# Checkout a current commit
-RUN cd /afl && git checkout 8cdc48f73a17ddd557897f2098937a8ba3bfe184
-
-# Build without Python support as we don't need it.
-# Set AFL_NO_X86 to skip flaky tests.
-RUN cd /afl && \
-    unset CFLAGS CXXFLAGS && \
-    export CC=clang AFL_NO_X86=1 && \
-    PYTHON_INCLUDE=/ make && \
-    make install && \
-    cp utils/aflpp_driver/libAFLDriver.a /
+# Install dependencies.
+RUN apt-get update && \
+    apt-get remove -y llvm-10 && \
+    apt-get install -y \
+        build-essential \
+        llvm-11 \
+        clang-12 \
+        cargo && \
+    apt-get install -y wget libstdc++5 libtool-bin automake flex bison \
+        libglib2.0-dev libpixman-1-dev python3-setuptools unzip \
+        apt-utils apt-transport-https ca-certificates joe curl && \
+    PATH="/root/.cargo/bin/:$PATH" cargo install cargo-make
 
 # Download libafl.
 RUN git clone https://github.com/AFLplusplus/LibAFL /libafl
 
 # Checkout a current commit
-RUN cd /libafl && git checkout 664e87809e6005f1814df1b55a345e7b2247f15b
+RUN cd /libafl && git checkout 3ce0c102affeace754072368013422e97b9dce9c || true
+# Note that due a nightly bug it is currently fixed to a known version on top!
 
 # Compile libafl.
 RUN cd /libafl && \
     unset CFLAGS CXXFLAGS && \
-    cd ./fuzzers/fuzzbench_forkserver && \
-    PATH="/root/.cargo/bin/:$PATH" cargo build --release
-
+    export LIBAFL_EDGES_MAP_SIZE=2621440 && \
+    cd ./fuzzers/fuzzbench && \
+    PATH="/root/.cargo/bin/:$PATH" cargo build --release --features no_link_main
+
+# Auxiliary weak references.
+RUN cd /libafl/fuzzers/fuzzbench && \
+    clang -c stub_rt.c && \
+    ar r /stub_rt.a stub_rt.o
diff --git a/fuzzers/libafl_27042023/description.md b/fuzzers/libafl_27042023/description.md
new file mode 100644
index 000000000..ea9b947d6
--- /dev/null
+++ b/fuzzers/libafl_27042023/description.md
@@ -0,0 +1,11 @@
+# libafl
+
+libafl fuzzer instance 
+  - cmplog feature
+  - persistent mode
+
+Repository: [https://github.com/AFLplusplus/libafl/](https://github.com/AFLplusplus/libafl/)
+
+[builder.Dockerfile](builder.Dockerfile)
+[fuzzer.py](fuzzer.py)
+[runner.Dockerfile](runner.Dockerfile)
diff --git a/fuzzers/libafl_27042023/fuzzer.py b/fuzzers/libafl_27042023/fuzzer.py
new file mode 100755
index 000000000..d00bb1dd5
--- /dev/null
+++ b/fuzzers/libafl_27042023/fuzzer.py
@@ -0,0 +1,67 @@
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+"""Integration code for a LibAFL-based fuzzer."""
+
+import os
+import subprocess
+
+from fuzzers import utils
+
+
+def prepare_fuzz_environment(input_corpus):
+    """Prepare to fuzz with a LibAFL-based fuzzer."""
+    os.environ['ASAN_OPTIONS'] = 'abort_on_error=1:detect_leaks=0:'\
+                                 'malloc_context_size=0:symbolize=0:'\
+                                 'allocator_may_return_null=1:'\
+                                 'detect_odr_violation=0:handle_segv=0:'\
+                                 'handle_sigbus=0:handle_abort=0:'\
+                                 'handle_sigfpe=0:handle_sigill=0'
+    os.environ['UBSAN_OPTIONS'] =  'abort_on_error=1:'\
+                                   'allocator_release_to_os_interval_ms=500:'\
+                                   'handle_abort=0:handle_segv=0:'\
+                                   'handle_sigbus=0:handle_sigfpe=0:'\
+                                   'handle_sigill=0:print_stacktrace=0:'\
+                                   'symbolize=0:symbolize_inline_frames=0'
+    # Create at least one non-empty seed to start.
+    utils.create_seed_file_for_empty_corpus(input_corpus)
+
+
+def build():  # pylint: disable=too-many-branches,too-many-statements
+    """Build benchmark."""
+    os.environ['CC'] = '/libafl/fuzzers/fuzzbench/target/release/libafl_cc'
+    os.environ['CXX'] = '/libafl/fuzzers/fuzzbench/target/release/libafl_cxx'
+
+    os.environ['ASAN_OPTIONS'] = 'abort_on_error=0:allocator_may_return_null=1'
+    os.environ['UBSAN_OPTIONS'] = 'abort_on_error=0'
+
+    cflags = ['--libafl']
+    utils.append_flags('CFLAGS', cflags)
+    utils.append_flags('CXXFLAGS', cflags)
+    utils.append_flags('LDFLAGS', cflags)
+
+    os.environ['FUZZER_LIB'] = '/stub_rt.a'
+    utils.build_benchmark()
+
+
+def fuzz(input_corpus, output_corpus, target_binary):
+    """Run fuzzer."""
+    prepare_fuzz_environment(input_corpus)
+    dictionary_path = utils.get_dictionary_path(target_binary)
+    command = [target_binary]
+    if dictionary_path:
+        command += (['-x', dictionary_path])
+    command += (['-o', output_corpus, '-i', input_corpus])
+    print(command)
+    subprocess.check_call(command, cwd=os.environ['OUT'])
diff --git a/fuzzers/libafl_forkserver/runner.Dockerfile b/fuzzers/libafl_27042023/runner.Dockerfile
similarity index 100%
rename from fuzzers/libafl_forkserver/runner.Dockerfile
rename to fuzzers/libafl_27042023/runner.Dockerfile
diff --git a/fuzzers/libafl_forkserver/description.md b/fuzzers/libafl_forkserver/description.md
deleted file mode 100644
index 445a27663..000000000
--- a/fuzzers/libafl_forkserver/description.md
+++ /dev/null
@@ -1,13 +0,0 @@
-# aflplusplus
-
-AFL++ fuzzer instance that has the following config active for all benchmarks:
-  - PCGUARD instrumentation 
-  - cmplog feature
-  - "fast" power schedule
-  - persistent mode + shared memory test cases
-
-Repository: [https://github.com/AFLplusplus/AFLplusplus/](https://github.com/AFLplusplus/AFLplusplus/)
-
-[builder.Dockerfile](builder.Dockerfile)
-[fuzzer.py](fuzzer.py)
-[runner.Dockerfile](runner.Dockerfile)
diff --git a/fuzzers/libafl_forkserver/fuzzer.py b/fuzzers/libafl_forkserver/fuzzer.py
deleted file mode 100755
index c8b66976f..000000000
--- a/fuzzers/libafl_forkserver/fuzzer.py
+++ /dev/null
@@ -1,67 +0,0 @@
-# Copyright 2020 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-"""Integration code for a LibAFL fuzzer with an AFL++ forkserver."""
-
-import os
-import shutil
-import subprocess
-
-from fuzzers import utils
-from fuzzers.aflplusplus import fuzzer as aflplusplus_fuzzer
-from fuzzers.libafl import fuzzer as libafl_fuzzer
-
-
-def build():
-    """Build benchmark."""
-    # Build the target with AFL++
-    aflplusplus_fuzzer.build('tracepc', 'cmplog', 'dict2file')
-
-    # Copy to fuzzer to OUT
-    build_directory = os.environ['OUT']
-    fuzzer = '/libafl/fuzzers/fuzzbench_forkserver/' \
-              'target/release/fuzzbench_forkserver'
-    shutil.copy(fuzzer, build_directory)
-
-
-def fuzz(input_corpus, output_corpus, target_binary):
-    """Run fuzzer."""
-    # Calculate CmpLog binary path from the instrumented target binary.
-    target_binary_directory = os.path.dirname(target_binary)
-    cmplog_target_binary_directory = \
-        aflplusplus_fuzzer.get_cmplog_build_directory(target_binary_directory)
-    target_binary_name = os.path.basename(target_binary)
-    cmplog_target_binary = os.path.join(cmplog_target_binary_directory,
-                                        target_binary_name)
-
-    # Setup env vars
-    libafl_fuzzer.prepare_fuzz_environment(input_corpus)
-
-    # Merge dictionaries
-    dictionary_path = utils.get_dictionary_path(target_binary)
-    if os.path.exists('./afl++.dict'):
-        if dictionary_path:
-            with open('./afl++.dict', encoding='utf-8') as dictfile:
-                autodict = dictfile.read()
-            with open(dictionary_path, 'a', encoding='utf-8') as dictfile:
-                dictfile.write(autodict)
-        else:
-            dictionary_path = './afl++.dict'
-
-    # Run the fuzzer
-    command = ['./fuzzbench_forkserver', '-c', cmplog_target_binary]
-    if dictionary_path:
-        command += (['-x', dictionary_path])
-    command += (['-o', output_corpus, '-i', input_corpus, target_binary])
-    print(command)
-    subprocess.check_call(command)
diff --git a/service/gcbrun_experiment.py b/service/gcbrun_experiment.py
index bbebcf1b9..f19ab493d 100644
--- a/service/gcbrun_experiment.py
+++ b/service/gcbrun_experiment.py
@@ -28,6 +28,7 @@
 TRIGGER_COMMAND = '/gcbrun'
 RUN_EXPERIMENT_COMMAND_STR = f'{TRIGGER_COMMAND} run_experiment.py '
 SKIP_COMMAND_STR = f'{TRIGGER_COMMAND} skip'
+# A DUMMY COMMENT
 
 
 def get_comments(pull_request_number):