diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 01449c6..91dd62a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -24,8 +24,12 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
+        apt update
+        apt install software-properties-common -y
+        add-apt-repository ppa:ubuntu-toolchain-r/test
         apt update
         apt install build-essential -y
+        apt install gcc-13 -y
         python -m pip install --upgrade pip
         pip install -r requirements.txt
     - name: Run tests
diff --git a/README.md b/README.md
index 464f6a3..d06cb84 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 This script provides ability to postprocess code, which is decompiled via Ghidra, to make it closer to recompilable.
 # Technologies used
 * [Python 3.12](https://www.python.org/)
-* [pyhidra](https://github.com/dod-cyber-crime-center/pyhidra)
+* [pyhidra 1.3.0](https://github.com/dod-cyber-crime-center/pyhidra)
 * [Ghidra 11.1.0](https://github.com/NationalSecurityAgency/ghidra)
 
 Development:
@@ -13,10 +13,10 @@ Development:
 * [Shellcheck](https://www.shellcheck.net/)
 
 Running tests:
-* [GCC](https://gcc.gnu.org/)
+* [GCC 13](https://gcc.gnu.org/)
 
 # Setup
-Ensure that you do have Python with installed pip, Ghidra app and GCC compiler. If you want to run CI scripts, ensure you do have shellcheck installed.
+Ensure that you do have Python with installed pip, Ghidra app and GCC-13 compiler. If you want to run CI scripts, ensure you do have shellcheck installed.
 Then just clone the repo 
 using HTTPS:
 ```shell
@@ -55,15 +55,11 @@ python3 run.py res/in/hello_world res/out/hello_world.c
 ```
 After this, you can try to compile output code. Example with GCC:
 ```shell
-gcc res/out/hello_world.c
+gcc-13 res/out/hello_world.c
 ```
 Enjoy!
 # Running tests
-Ensure you do have res/out directory set.
-```shell
-mkdir -p res/out
-```
-After that, you can run our tests using pytest.
+You can run our tests using pytest.
 ```shell
 pytest src/tests/user_tests.py
 ```
diff --git a/ci/test.sh b/ci/test.sh
index 384130a..a0ecebc 100755
--- a/ci/test.sh
+++ b/ci/test.sh
@@ -1,4 +1,3 @@
 #!/bin/bash
 echo "Run tests"
-mkdir -p res/out
 pytest src/tests/user_tests.py
diff --git a/requirements.txt b/requirements.txt
index 094f2a5..95f22cb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
-pyhidra==1.2.0
+pyhidra==1.3.0
 pytest==8.3.2
 pylint==3.2.6
diff --git a/src/scripts/dump.py b/src/scripts/dump.py
index fd03bf5..8f6df9f 100644
--- a/src/scripts/dump.py
+++ b/src/scripts/dump.py
@@ -14,9 +14,6 @@
 from ghidra.program.model.data import Structure
 from ghidra.program.model.data import Union
 
-CONCAT_LEN = 6  # = len("CONCAT")
-BYTE_SIZE = 8
-
 
 def put_program_data_types(program, file_writer, monitor, library_list):
     """Dumps program data types"""
diff --git a/src/tests/user_tests.py b/src/tests/user_tests.py
index 17c8499..1c4a473 100644
--- a/src/tests/user_tests.py
+++ b/src/tests/user_tests.py
@@ -6,12 +6,14 @@
 
 INPUT_DIRECTORY = "res/in/"
 OUTPUT_PATH = "res/out/code.c"
-COMPILER = "gcc"
+COMPILER = "gcc-13"
 
 
 @pytest.fixture(scope='module')
-def clean():
-    """Deleting a.out and code.c files"""
+def chores():
+    """Create output directory before running tests
+    deleting a.out and code.c files after running tests"""
+    os.makedirs("res/out", exist_ok = True)
     yield
     os.remove("a.out")
     os.remove(OUTPUT_PATH)
@@ -24,27 +26,27 @@ def compile_binary(binary):
     return os.system(f"{COMPILER} {OUTPUT_PATH}")
 
 
-def test_hello_world(clean):
+def test_hello_world(chores):
     """Recompiles hello world binary"""
     assert compile_binary("hello_world") == 0
 
-def test_bmp(clean):
+def test_bmp(chores):
     """Recompiles BMP header reader binary"""
     assert compile_binary("bmp1") == 0
 
-def test_bst(clean):
+def test_bst(chores):
     """Recompiles binary search tree binary"""
     assert compile_binary("bst") == 0
 
-def test_avl(clean):
+def test_avl(chores):
     """Recompiles AVL tree binary"""
     assert compile_binary("avl") == 0
 
-def test_linpack(clean):
-    """Recompiles AVL tree binary"""
+def test_linpack(chores):
+    """Recompiles linpack binary"""
     assert compile_binary("linpack") == 0
 
-def test_export_c_code():
+def test_export_c_code(chores):
     """Postprocessor test"""
     for binary in os.listdir(INPUT_DIRECTORY):
         export_c_code(f"{INPUT_DIRECTORY}{binary}", OUTPUT_PATH)