diff --git a/requirements/requirements-prod.in b/requirements/requirements-prod.in
index 4edbd91f0..4068789fc 100644
--- a/requirements/requirements-prod.in
+++ b/requirements/requirements-prod.in
@@ -21,7 +21,7 @@ gdata==2.0.18
 gunicorn==23.0.0
 hiredis==2.3.2
 html2text==2020.1.16
-icalendar==4.0.9
+icalendar==7.0.3
 imapclient==2.2.0
 importlib-metadata==4.8.1
 importlib-resources==5.4.0
diff --git a/requirements/requirements-prod.txt b/requirements/requirements-prod.txt
index f023cdd2d..f335289f4 100644
--- a/requirements/requirements-prod.txt
+++ b/requirements/requirements-prod.txt
@@ -511,9 +511,9 @@ html2text==2020.1.16 \
     --hash=sha256:c7c629882da0cf377d66f073329ccf34a12ed2adf0169b9285ae4e63ef54c82b \
     --hash=sha256:e296318e16b059ddb97f7a8a1d6a5c1d7af4544049a01e261731d2d5cc277bbb
     # via -r requirements-prod.in
-icalendar==4.0.9 \
-    --hash=sha256:cc73fa9c848744843046228cb66ea86cd8c18d73a51b140f7c003f760b84a997 \
-    --hash=sha256:cf1446ffdf1b6ad469451a8966cfa7694f5fac796ac6fc7cd93e28c51a637d2c
+icalendar==7.0.3 \
+    --hash=sha256:8c9fea6d3a89671bba8b6938d8565b4d0ec465c6a2796ef0f92790dcb9e627cd \
+    --hash=sha256:95027ece087ab87184d765f03761f25875821f74cdd18d3b57e9c868216d8fde
     # via -r requirements-prod.in
 idna==3.7 \
     --hash=sha256:028ff3aadf0609c1fd278d8ea3089299412a7a8b9bd005dd08b9f8285bcb5cfc \
@@ -819,7 +819,6 @@ pytz==2026.1.post1 \
     # via
     #   -r requirements-prod.in
     #   flask-restful
-    #   icalendar
 pyyaml==6.0.2 \
     --hash=sha256:01179a4a8559ab5de078078f37e5c1a30d76bb88519906844fd7bdea1b7729ff \
     --hash=sha256:0833f8694549e586547b576dcfaba4a6b55b9e96098b36cdc7ebefe667dfed48 \
@@ -1139,7 +1138,13 @@ traitlets==5.9.0 \
 typing-extensions==4.12.2 \
     --hash=sha256:04e5ca0351e0f3f85c6853954072df659d0d13fac324d0072316b67d7794700d \
     --hash=sha256:1a7ead55c7e559dd4dee8856e3a88b41225abfe1ce8df57b7c13915fe121ffb8
-    # via -r requirements-prod.in
+    # via
+    #   -r requirements-prod.in
+    #   icalendar
+tzdata==2026.1 \
+    --hash=sha256:4b1d2be7ac37ceafd7327b961aa3a54e467efbdb563a23655fbfe0d39cfc42a9 \
+    --hash=sha256:67658a1903c75917309e753fdc349ac0efd8c27db7a0cb406a25be4840f87f98
+    # via icalendar
 urllib3==2.6.3 \
     --hash=sha256:1b62b6884944a57dbe321509ab94fd4d3b307075e0c2eae991ac71ee15ad38ed \
     --hash=sha256:bf272323e553dfb2e87d9bfd225ca7b0f467b919d7bbd355436d3fd37cb0acd4