diff --git a/.circleci/config.yml b/.circleci/config.yml
index 270afeb53..a955a9c1f 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -58,6 +58,10 @@ workflows:
           name: go-1-19
           go_version: "1.19"
           run_lint: true
+      - test:
+          name: go-1-20
+          go_version: "1.20"
+          run_lint: true
           # Style and unused/missing packages are only checked against
           # the latest supported Go version.
           run_style_and_unused: true
diff --git a/prometheus/gen_go_collector_metrics_set.go b/prometheus/gen_go_collector_metrics_set.go
index 74b67acce..66fd70515 100644
--- a/prometheus/gen_go_collector_metrics_set.go
+++ b/prometheus/gen_go_collector_metrics_set.go
@@ -50,7 +50,9 @@ func main() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	gv, err := version.NewVersion(strings.TrimPrefix(toolVersion, "go"))
+
+	toolVersion = strings.Split(strings.TrimPrefix(toolVersion, "go"), " ")[0]
+	gv, err := version.NewVersion(toolVersion)
 	if err != nil {
 		log.Fatal(err)
 	}
diff --git a/prometheus/go_collector_metrics_go120_test.go b/prometheus/go_collector_metrics_go120_test.go
new file mode 100644
index 000000000..60517c4c2
--- /dev/null
+++ b/prometheus/go_collector_metrics_go120_test.go
@@ -0,0 +1,57 @@
+// Code generated by gen_go_collector_metrics_set.go; DO NOT EDIT.
+//go:generate go run gen_go_collector_metrics_set.go go1.20
+
+//go:build go1.20 && !go1.21
+// +build go1.20,!go1.21
+
+package prometheus
+
+var expectedRuntimeMetrics = map[string]string{
+	"/cgo/go-to-c-calls:calls":                     "go_cgo_go_to_c_calls_calls_total",
+	"/cpu/classes/gc/mark/assist:cpu-seconds":      "go_cpu_classes_gc_mark_assist_cpu_seconds_total",
+	"/cpu/classes/gc/mark/dedicated:cpu-seconds":   "go_cpu_classes_gc_mark_dedicated_cpu_seconds_total",
+	"/cpu/classes/gc/mark/idle:cpu-seconds":        "go_cpu_classes_gc_mark_idle_cpu_seconds_total",
+	"/cpu/classes/gc/pause:cpu-seconds":            "go_cpu_classes_gc_pause_cpu_seconds_total",
+	"/cpu/classes/gc/total:cpu-seconds":            "go_cpu_classes_gc_total_cpu_seconds_total",
+	"/cpu/classes/idle:cpu-seconds":                "go_cpu_classes_idle_cpu_seconds_total",
+	"/cpu/classes/scavenge/assist:cpu-seconds":     "go_cpu_classes_scavenge_assist_cpu_seconds_total",
+	"/cpu/classes/scavenge/background:cpu-seconds": "go_cpu_classes_scavenge_background_cpu_seconds_total",
+	"/cpu/classes/scavenge/total:cpu-seconds":      "go_cpu_classes_scavenge_total_cpu_seconds_total",
+	"/cpu/classes/total:cpu-seconds":               "go_cpu_classes_total_cpu_seconds_total",
+	"/cpu/classes/user:cpu-seconds":                "go_cpu_classes_user_cpu_seconds_total",
+	"/gc/cycles/automatic:gc-cycles":               "go_gc_cycles_automatic_gc_cycles_total",
+	"/gc/cycles/forced:gc-cycles":                  "go_gc_cycles_forced_gc_cycles_total",
+	"/gc/cycles/total:gc-cycles":                   "go_gc_cycles_total_gc_cycles_total",
+	"/gc/heap/allocs-by-size:bytes":                "go_gc_heap_allocs_by_size_bytes",
+	"/gc/heap/allocs:bytes":                        "go_gc_heap_allocs_bytes_total",
+	"/gc/heap/allocs:objects":                      "go_gc_heap_allocs_objects_total",
+	"/gc/heap/frees-by-size:bytes":                 "go_gc_heap_frees_by_size_bytes",
+	"/gc/heap/frees:bytes":                         "go_gc_heap_frees_bytes_total",
+	"/gc/heap/frees:objects":                       "go_gc_heap_frees_objects_total",
+	"/gc/heap/goal:bytes":                          "go_gc_heap_goal_bytes",
+	"/gc/heap/objects:objects":                     "go_gc_heap_objects_objects",
+	"/gc/heap/tiny/allocs:objects":                 "go_gc_heap_tiny_allocs_objects_total",
+	"/gc/limiter/last-enabled:gc-cycle":            "go_gc_limiter_last_enabled_gc_cycle",
+	"/gc/pauses:seconds":                           "go_gc_pauses_seconds",
+	"/gc/stack/starting-size:bytes":                "go_gc_stack_starting_size_bytes",
+	"/memory/classes/heap/free:bytes":              "go_memory_classes_heap_free_bytes",
+	"/memory/classes/heap/objects:bytes":           "go_memory_classes_heap_objects_bytes",
+	"/memory/classes/heap/released:bytes":          "go_memory_classes_heap_released_bytes",
+	"/memory/classes/heap/stacks:bytes":            "go_memory_classes_heap_stacks_bytes",
+	"/memory/classes/heap/unused:bytes":            "go_memory_classes_heap_unused_bytes",
+	"/memory/classes/metadata/mcache/free:bytes":   "go_memory_classes_metadata_mcache_free_bytes",
+	"/memory/classes/metadata/mcache/inuse:bytes":  "go_memory_classes_metadata_mcache_inuse_bytes",
+	"/memory/classes/metadata/mspan/free:bytes":    "go_memory_classes_metadata_mspan_free_bytes",
+	"/memory/classes/metadata/mspan/inuse:bytes":   "go_memory_classes_metadata_mspan_inuse_bytes",
+	"/memory/classes/metadata/other:bytes":         "go_memory_classes_metadata_other_bytes",
+	"/memory/classes/os-stacks:bytes":              "go_memory_classes_os_stacks_bytes",
+	"/memory/classes/other:bytes":                  "go_memory_classes_other_bytes",
+	"/memory/classes/profiling/buckets:bytes":      "go_memory_classes_profiling_buckets_bytes",
+	"/memory/classes/total:bytes":                  "go_memory_classes_total_bytes",
+	"/sched/gomaxprocs:threads":                    "go_sched_gomaxprocs_threads",
+	"/sched/goroutines:goroutines":                 "go_sched_goroutines_goroutines",
+	"/sched/latencies:seconds":                     "go_sched_latencies_seconds",
+	"/sync/mutex/wait/total:seconds":               "go_sync_mutex_wait_total_seconds_total",
+}
+
+const expectedRuntimeMetricsCardinality = 89