diff --git a/requirements-dev.in b/requirements-dev.in
index 6507c100..85a1bee2 100644
--- a/requirements-dev.in
+++ b/requirements-dev.in
@@ -31,7 +31,7 @@ cattrs==24.1.2
     # via
     #   -c requirements.txt
     #   mozilla-metric-config-parser
-certifi==2025.1.31
+certifi==2025.4.26
     # via
     #   -c requirements.txt
     #   requests
diff --git a/requirements-dev.txt b/requirements-dev.txt
index ec03616e..dbf9dace 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -44,9 +44,9 @@ cattrs==24.1.2 \
     # via
     #   -r requirements-dev.in
     #   mozilla-metric-config-parser
-certifi==2025.1.31 \
-    --hash=sha256:3d5da6925056f6f18f119200434a4780a94263f10d1c21d032a6f6b2baa20651 \
-    --hash=sha256:ca78db4565a652026a4db2bcdf68f2fb589ea80d0be70e03929ed730746b84fe
+certifi==2025.4.26 \
+    --hash=sha256:0a816057ea3cdefcef70270d2c515e4506bbc954f417fa5ade2021213bb8f0c6 \
+    --hash=sha256:30350364dfe371162649852c63336a15c70c6510c2ad5015b21c2345311805f3
     # via
     #   -r requirements-dev.in
     #   requests
diff --git a/requirements.in b/requirements.in
index 9a45e599..04c0ecfe 100644
--- a/requirements.in
+++ b/requirements.in
@@ -17,7 +17,7 @@ cachetools==5.5.2
     # via google-auth
 cattrs==24.1.2
     # via mozilla-metric-config-parser
-certifi==2025.1.31
+certifi==2025.4.26
     # via requests
 cffi==1.17.1
     # via cryptography
diff --git a/requirements.txt b/requirements.txt
index 8c0fcd9e..f88c66ed 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -31,9 +31,9 @@ cattrs==24.1.2 \
     # via
     #   -r requirements.in
     #   mozilla-metric-config-parser
-certifi==2025.1.31 \
-    --hash=sha256:3d5da6925056f6f18f119200434a4780a94263f10d1c21d032a6f6b2baa20651 \
-    --hash=sha256:ca78db4565a652026a4db2bcdf68f2fb589ea80d0be70e03929ed730746b84fe
+certifi==2025.4.26 \
+    --hash=sha256:0a816057ea3cdefcef70270d2c515e4506bbc954f417fa5ade2021213bb8f0c6 \
+    --hash=sha256:30350364dfe371162649852c63336a15c70c6510c2ad5015b21c2345311805f3
     # via
     #   -r requirements.in
     #   requests