diff --git a/flake.lock b/flake.lock
index b0296f5f3..faa79accc 100644
--- a/flake.lock
+++ b/flake.lock
@@ -594,12 +594,12 @@
         "rev": "9f8d26371d4760f8985e7bbe00c3ac16be1301bc",
         "revCount": 5208,
         "type": "git",
-        "url": "https://gitlab.uniworx.de/haskell/yesod.git"
+        "url": "https://gitlab.uniworx.de/haskell/yesod.git?commit=aa671eb41fdad360f2f7cb844f8de03479efe3f7"
       },
       "original": {
         "ref": "uni2work",
         "type": "git",
-        "url": "https://gitlab.uniworx.de/haskell/yesod.git"
+        "url": "https://gitlab.uniworx.de/haskell/yesod.git?commit=aa671eb41fdad360f2f7cb844f8de03479efe3f7"
       }
     },
     "yesod-auth-oauth2": {
diff --git a/flake.nix b/flake.nix
index ba356dbe0..2490b59e4 100644
--- a/flake.nix
+++ b/flake.nix
@@ -73,7 +73,7 @@
       flake = false;
     };
     yesod = {
-      url = "git+https://gitlab.uniworx.de/haskell/yesod.git?ref=uni2work";
+      url = "git+https://gitlab.uniworx.de/haskell/yesod.git?ref=uni2work&commit=aa671eb41fdad360f2f7cb844f8de03479efe3f7";
       flake = false;
     };
     yesod-auth-oauth2 = {