diff --git a/pkgs/by-name/pr/prometheus/package.nix b/pkgs/by-name/pr/prometheus/package.nix
index 7ab27fa8cefa..23deee23b54f 100644
--- a/pkgs/by-name/pr/prometheus/package.nix
+++ b/pkgs/by-name/pr/prometheus/package.nix
@@ -94,10 +94,6 @@ buildGoModule (finalAttrs: {
 
   proxyVendor = true;
 
-  patches = [
-    ./prometheus-pr18519-fix-TestFsType.patch
-  ];
-
   outputs = [
     "out"
     "doc"
diff --git a/pkgs/by-name/pr/prometheus/prometheus-pr18519-fix-TestFsType.patch b/pkgs/by-name/pr/prometheus/prometheus-pr18519-fix-TestFsType.patch
deleted file mode 100644
index a7ad2c20b32c..000000000000
--- a/pkgs/by-name/pr/prometheus/prometheus-pr18519-fix-TestFsType.patch
+++ /dev/null
@@ -1,25 +0,0 @@
---- a/util/runtime/statfs_unix_test.go
-+++ b/util/runtime/statfs_unix_test.go
-@@ -19,20 +19,18 @@ import (
- 	"os"
- 	"testing"
-
--	"github.com/grafana/regexp"
- 	"github.com/stretchr/testify/require"
- )
-
--var regexpFsType = regexp.MustCompile("^[A-Z][A-Z0-9_]*_MAGIC$")
--
- func TestFsType(t *testing.T) {
- 	var fsType string
-
- 	path, err := os.Getwd()
- 	require.NoError(t, err)
-
-+	// A real path must yield a non-zero filesystem type.
- 	fsType = FsType(path)
--	require.Regexp(t, regexpFsType, fsType)
-+	require.NotEqual(t, "0", fsType)
-
- 	fsType = FsType("/no/where/to/be/found")
- 	require.Equal(t, "0", fsType)
diff --git a/pkgs/by-name/pr/prometheus/source.nix b/pkgs/by-name/pr/prometheus/source.nix
index 7a582275a2f2..f1322bb8c0ca 100644
--- a/pkgs/by-name/pr/prometheus/source.nix
+++ b/pkgs/by-name/pr/prometheus/source.nix
@@ -1,6 +1,6 @@
 {
-  version = "3.11.3";
-  hash = "sha256-JmnVTVW6LsrdiQspKznksyhAYkmCXQcqCLK8q5nZI48=";
-  npmDepsHash = "sha256-6uE8d3+v5wobSyCl8oYlbNQZjRj/WtvVrpzo/PR2hQA=";
-  vendorHash = "sha256-wR1b5jV/2B50OeKokv8Ss+tpSXNjJBsLIZrK7gOb168=";
+  version = "3.12.0";
+  hash = "sha256-xeENUVmG9tbIF+7i2u9zuvo7RXI9iNWFVDNUfNpF6/4=";
+  npmDepsHash = "sha256-cHMI5DqSRpIanrgk/H3aFUHLrGXH1v796PH1qDrCnbE=";
+  vendorHash = "sha256-caSI9uzbH93j06sJus9jSqo6qHKbP8D9DuDkiAlnfF4=";
 }