diff --git a/dev_requirements.txt b/dev_requirements.txt
index 43e5e0b..eab5afb 100644
--- a/dev_requirements.txt
+++ b/dev_requirements.txt
@@ -1,4 +1,4 @@
-cffi>=1.15.0
+cffi>=1.15.1
 psutil>=5.8.0
 numpy>=1.19.5
 pandas>=1.1.5; platform.python_implementation == 'CPython'
diff --git a/nfstream/engine/lib_engine.c b/nfstream/engine/lib_engine.c
index ca94b17..301e813 100644
--- a/nfstream/engine/lib_engine.c
+++ b/nfstream/engine/lib_engine.c
@@ -889,8 +889,8 @@ static void flow_bidirectional_dissection_collect_info(struct ndpi_detection_mod
   }
   // HTTP: UserAgent and ContentType. With server name this is sufficient. (at least for now)
   else if (flow_is_ndpi_proto(flow, NDPI_PROTOCOL_HTTP)) {
-    memcpy(flow->content_type, flow->ndpi_flow->http.content_type ? flow->ndpi_flow->http.content_type : "", sizeof(flow->content_type));
-    memcpy(flow->user_agent, flow->ndpi_flow->http.user_agent ? flow->ndpi_flow->http.user_agent : "", sizeof(flow->user_agent));
+    ndpi_snprintf(flow->content_type, sizeof(flow->content_type), "%s", flow->ndpi_flow->http.content_type ? flow->ndpi_flow->http.content_type : "");
+    ndpi_snprintf(flow->user_agent, sizeof(flow->user_agent), "%s", (flow->ndpi_flow->http.user_agent ? flow->ndpi_flow->http.user_agent : ""));
   // SSH: https://github.com/salesforce/hassh
   //      We extract both client and server fingerprints hassh fingerprints for SSH.
   } else if (flow_is_ndpi_proto(flow, NDPI_PROTOCOL_SSH)) {
@@ -906,7 +906,7 @@ static void flow_bidirectional_dissection_collect_info(struct ndpi_detection_mod
            flow_is_ndpi_proto(flow, NDPI_PROTOCOL_MAIL_SMTPS) || flow_is_ndpi_proto(flow, NDPI_PROTOCOL_MAIL_IMAPS) ||
            flow_is_ndpi_proto(flow, NDPI_PROTOCOL_MAIL_POPS) || flow_is_ndpi_proto(flow, NDPI_PROTOCOL_QUIC)) {
     memcpy(flow->requested_server_name, flow->ndpi_flow->host_server_name, sizeof(flow->requested_server_name));
-    memcpy(flow->user_agent, flow->ndpi_flow->http.user_agent ? flow->ndpi_flow->http.user_agent : "", sizeof(flow->user_agent));
+    ndpi_snprintf(flow->user_agent, sizeof(flow->user_agent), "%s", (flow->ndpi_flow->http.user_agent ? flow->ndpi_flow->http.user_agent : ""));
     memcpy(flow->c_hash, flow->ndpi_flow->protos.tls_quic.ja3_client, sizeof(flow->c_hash));
     memcpy(flow->s_hash, flow->ndpi_flow->protos.tls_quic.ja3_server, sizeof(flow->s_hash));
   }
diff --git a/requirements.txt b/requirements.txt
index 5777cfc..689a45f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-cffi>=1.15.0
+cffi>=1.15.1
 psutil>=5.8.0
 numpy>=1.19.5
 pandas>=1.1.5; platform.python_implementation == 'CPython'
diff --git a/setup.py b/setup.py
index 1e2c913..ce4c783 100644
--- a/setup.py
+++ b/setup.py
@@ -27,7 +27,7 @@ THIS_DIRECTORY = os.path.abspath(os.path.dirname(__file__))
 with open(os.path.join(THIS_DIRECTORY, 'README.md'), encoding='utf-8') as f:
     long_description = f.read()
 
-install_requires = ['cffi>=1.15.0',
+install_requires = ['cffi>=1.15.1',
                     'psutil>=5.8.0',
                     'dpkt>=1.9.7',
                     'numpy>=1.19.5']