diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index b64117daf8257230e49ce1c955088a44707702b1..96a4bc849e7bb8821afaa322105207744d4ca026 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -45,7 +45,7 @@ jobs:
 
     - name: "Install Tahoe-LAFS master@HEAD"
       run: |
-        python -m pip install git+https://github.com/tahoe-lafs/tahoe-lafs@master#egg=tahoe-lafs
+        python -m pip install tahoe-lafs==1.14.0
 
     - name: "Install Test Dependencies"
       run: |
diff --git a/setup.cfg b/setup.cfg
index 371a19b343c204fb576b2c6d8c77d969160d40e3..3856a101d93c97685288e2cbc6d83adcc5ac215a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -38,7 +38,7 @@ install_requires =
     python-challenge-bypass-ristretto
     # Inherit our Twisted dependency from tahoe-lafs so we don't accidentally
     # get the extras wrong here and break stuff.
-    tahoe-lafs
+    tahoe-lafs==1.14.0
     treq
 
 [versioneer]