diff --git a/src/sentry/api/endpoints/group_tagkey_details.py b/src/sentry/api/endpoints/group_tagkey_details.py
index 1724d150fc6c49..c387e9c61afc40 100644
--- a/src/sentry/api/endpoints/group_tagkey_details.py
+++ b/src/sentry/api/endpoints/group_tagkey_details.py
@@ -35,9 +35,9 @@ class GroupTagKeyDetailsEndpoint(GroupEndpoint):
 
     rate_limits = {
         "GET": {
-            RateLimitCategory.IP: RateLimit(limit=10, window=1),
-            RateLimitCategory.USER: RateLimit(limit=10, window=1),
-            RateLimitCategory.ORGANIZATION: RateLimit(limit=40, window=1),
+            RateLimitCategory.IP: RateLimit(limit=10, window=1, concurrent_limit=10),
+            RateLimitCategory.USER: RateLimit(limit=10, window=1, concurrent_limit=10),
+            RateLimitCategory.ORGANIZATION: RateLimit(limit=40, window=1, concurrent_limit=10),
         }
     }
 
diff --git a/src/sentry/api/endpoints/group_tagkey_values.py b/src/sentry/api/endpoints/group_tagkey_values.py
index aa501b84332154..f63c7ca3799334 100644
--- a/src/sentry/api/endpoints/group_tagkey_values.py
+++ b/src/sentry/api/endpoints/group_tagkey_values.py
@@ -35,9 +35,9 @@ class GroupTagKeyValuesEndpoint(GroupEndpoint):
 
     rate_limits = {
         "GET": {
-            RateLimitCategory.IP: RateLimit(limit=10, window=1),
-            RateLimitCategory.USER: RateLimit(limit=10, window=1),
-            RateLimitCategory.ORGANIZATION: RateLimit(limit=40, window=1),
+            RateLimitCategory.IP: RateLimit(limit=10, window=1, concurrent_limit=10),
+            RateLimitCategory.USER: RateLimit(limit=10, window=1, concurrent_limit=10),
+            RateLimitCategory.ORGANIZATION: RateLimit(limit=40, window=1, concurrent_limit=10),
         }
     }