diff --git a/CHANGELOG.md b/CHANGELOG.md
index b7a09bf..6d5124d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,8 +5,16 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## dev
+
+
 ## [3.1.0]
 
+
+### Added
+
+- Added support to run the tool without SSL chain verification for users behind proxy servers who act as MITM
+
 ### Changed
 
 - Scoring formula changed to:
diff --git a/fusion_report/arguments.json b/fusion_report/arguments.json
index 3a25384..295523a 100644
--- a/fusion_report/arguments.json
+++ b/fusion_report/arguments.json
@@ -111,6 +111,11 @@
                     "key": "--no-mitelman",
                     "help": "Do not download mitelman fusion database",
                     "action": "store_true"
+                },
+                {
+                    "key": "-no_ssl",
+                    "help": "Turn off verification of SSL certificates when downloading data.",
+                    "action": "store_true"
                 }
             ],
             "cosmic": [
diff --git a/fusion_report/common/net.py b/fusion_report/common/net.py
index 00e5f28..198c8ab 100644
--- a/fusion_report/common/net.py
+++ b/fusion_report/common/net.py
@@ -96,13 +96,12 @@ def get_cosmic_qiagen_token(params: Namespace):
         return json.loads(token_response)["access_token"]
 
     @staticmethod
-    def get_large_file(url: str) -> None:
+    def get_large_file(url: str, no_ssl) -> None:
         """Method for downloading a large file."""
         LOG.info(f"Downloading {url}")
         try:
             headers = {"User-Agent": "Mozilla/5.0"}
-            response = requests.get(url, headers=headers, stream=True)
-
+            response = requests.get(url, headers=headers, stream=True, verify=no_ssl)
             file = url.split("/")[-1].split("?")[0]
 
             if (
@@ -118,7 +117,7 @@ def get_large_file(url: str) -> None:
             raise DownloadException(ex)
 
     @staticmethod
-    def get_cosmic_from_sanger(token: str, return_err: List[str]) -> None:
+    def get_cosmic_from_sanger(token: str, return_err: List[str], no_ssl) -> None:
         """Method for download COSMIC database from sanger website."""
         files = []
         file: str = Settings.COSMIC["FILE"]
@@ -131,10 +130,10 @@ def get_cosmic_from_sanger(token: str, return_err: List[str]) -> None:
             ),
         }
         try:
-            res = requests.get(url, headers=headers)
+            res = requests.get(url, headers=headers, verify=no_ssl)
             auth_url: str = res.json()["url"]
             LOG.info(f"auth_url: {auth_url}")
-            Net.get_large_file(auth_url)
+            Net.get_large_file(auth_url, no_ssl)
 
             files.append(".".join(file.split(".")[:-1]))
             with gzip.open(file, "rb") as archive, open(files[0], "wb") as out_file:
@@ -170,11 +169,11 @@ def get_cosmic_from_qiagen(token: str, return_err: List[str], outputpath: str) -
             return_err.append(f'{Settings.COSMIC["NAME"]}: {ex}')
 
     @staticmethod
-    def get_fusiongdb2(self, return_err: List[str]) -> None:
+    def get_fusiongdb2(self, return_err: List[str], no_ssl) -> None:
         """Method for download FusionGDB2 database."""
         try:
             url: str = f'{Settings.FUSIONGDB2["HOSTNAME"]}/{Settings.FUSIONGDB2["FILE"]}'
-            Net.get_large_file(url)
+            Net.get_large_file(url, no_ssl)
             file: str = f'{Settings.FUSIONGDB2["FILE"]}'
             df = pd.read_excel(file, engine="openpyxl")
             df["fusion"] = df["5'-gene (text format)"] + "--" + df["3'-gene (text format)"]
@@ -188,11 +187,11 @@ def get_fusiongdb2(self, return_err: List[str]) -> None:
             return_err.append(f"FusionGDB2: {ex}")
 
     @staticmethod
-    def get_mitelman(self, return_err: List[str]) -> None:
+    def get_mitelman(self, return_err: List[str], no_ssl) -> None:
         """Method for download Mitelman database."""
         try:
             url: str = f'{Settings.MITELMAN["HOSTNAME"]}/{Settings.MITELMAN["FILE"]}'
-            Net.get_large_file(url)
+            Net.get_large_file(url, no_ssl)
             with ZipFile(Settings.MITELMAN["FILE"], "r") as archive:
                 files = [
                     x for x in archive.namelist() if "MBCA.TXT.DATA" in x and not "MACOSX" in x
diff --git a/fusion_report/download.py b/fusion_report/download.py
index e739d32..b6aa668 100644
--- a/fusion_report/download.py
+++ b/fusion_report/download.py
@@ -42,21 +42,23 @@ def download_all(self, params: Namespace) -> None:
 
         if not params.no_mitelman:
             # MITELMAN
-            Net.get_mitelman(self, return_err)
+            Net.get_mitelman(self, return_err, params.no_ssl)
 
         if not params.no_fusiongdb2:
             # FusionGDB2
-            Net.get_fusiongdb2(self, return_err)
+            Net.get_fusiongdb2(self, return_err, params.no_ssl)
 
         if not params.no_cosmic:
             # COSMIC
             self.validate(params)
             if params.qiagen:
                 Logger(__name__).info("Downloading resources from QIAGEN...")
-                Net.get_cosmic_from_qiagen(self.cosmic_token, return_err, params.output)
+                Net.get_cosmic_from_qiagen(
+                    self.cosmic_token, return_err, params.output, params.no_ssl
+                )
             else:
                 Logger(__name__).info("Downloading resources from SANGER...")
-                Net.get_cosmic_from_sanger(self.cosmic_token, return_err)
+                Net.get_cosmic_from_sanger(self.cosmic_token, return_err, params.no_ssl)
 
         if len(return_err) > 0:
             raise DownloadException(return_err)