diff --git a/src/ntrip_client/nmea_fuzz_test.py b/src/ntrip_client/nmea_fuzz_test.py
new file mode 100644
index 0000000..af82d86
--- /dev/null
+++ b/src/ntrip_client/nmea_fuzz_test.py
@@ -0,0 +1,17 @@
+try:
+    import atheris
+except ImportError:
+    raise ImportError("You need to install atheris to run this script.")
+import sys
+
+with atheris.instrument_imports():
+    from nmea_parser import NMEAParser
+
+
+def TestOneInput(data):
+    parser = NMEAParser()
+    parser.is_valid_sentence(data)
+
+
+atheris.Setup(sys.argv, TestOneInput)
+atheris.Fuzz()
diff --git a/src/ntrip_client/rtcm_fuzz_test.py b/src/ntrip_client/rtcm_fuzz_test.py
new file mode 100644
index 0000000..ab73336
--- /dev/null
+++ b/src/ntrip_client/rtcm_fuzz_test.py
@@ -0,0 +1,17 @@
+try:
+    import atheris
+except ImportError:
+    raise ImportError("You need to install atheris to run this script.")
+import sys
+
+with atheris.instrument_imports():
+    from rtcm_parser import RTCMParser
+
+
+def TestOneInput(data):
+    parser = RTCMParser()
+    parser.parse(data)
+
+
+atheris.Setup(sys.argv, TestOneInput)
+atheris.Fuzz()