diff --git a/functions/poup.fish b/functions/poup.fish
index 16cef21..00d8746 100644
--- a/functions/poup.fish
+++ b/functions/poup.fish
@@ -1,6 +1,21 @@
 function poup
-    set toml_state (git status --porcelain pyproject.toml | head -c 2)
+    set -l toml_state (git status --porcelain pyproject.toml | head -c 2)
+    set -l project_type unknown
+    set -l lockfile unknown
 
+    if test -e poetry.lock
+        set project_type poetry
+        set lockfile poetry.lock
+    else if test -e uv.lock
+        set project_type uv
+        set lockfile uv.lock
+    else
+        echo "Unknown project type (neither poetry.lock nor uv.lock exists)" >/dev/stderr
+
+        return 1
+    end
+
+    # Make sure pyproject.toml doesn’t have conflicts
     if test "$toml_state" = UU
         echo "pyproject.toml has conflicts, resolve those first"
         git mergetool pyproject.toml; or return
@@ -8,9 +23,15 @@ function poup
     end
 
     if test "$toml_state" = "M " -o "$toml_state" = MM -o "$toml_state" = " M"
-        git checkout --ours poetry.lock
-        poetry lock --no-update
-        and git add poetry.lock
+        git checkout --ours $lockfile
+
+        if test $project_type = poetry
+            poetry lock --no-update
+        else if test $project_type = uv
+            uv lock
+        end
+
+        and git add $lockfile
     end
 
     set toml_state (git status --porcelain poetry.lock | head -c 2)