diff --git a/fuzz/fuzz_targets/rome_common.rs b/fuzz/fuzz_targets/rome_common.rs
index 158045afc7a..f79a525f375 100644
--- a/fuzz/fuzz_targets/rome_common.rs
+++ b/fuzz/fuzz_targets/rome_common.rs
@@ -18,6 +18,7 @@ use rome_json_parser::parse_json;
 use rome_service::Rules;
 use similar::TextDiff;
 use std::fmt::{Display, Formatter};
+use std::sync::OnceLock;
 
 pub fn fuzz_js_parser_with_source_type(data: &[u8], source: JsFileSource) -> Corpus {
     let Ok(code1) = std::str::from_utf8(data) else { return Corpus::Reject; };
@@ -32,9 +33,13 @@ pub fn fuzz_js_parser_with_source_type(data: &[u8], source: JsFileSource) -> Cor
     Corpus::Keep
 }
 
-static mut ANALYSIS_RULES: Option<Rules> = None;
-static mut ANALYSIS_RULE_FILTERS: Option<Vec<RuleFilter>> = None;
-static mut ANALYSIS_OPTIONS: Option<AnalyzerOptions> = None;
+static ANALYSIS_RULES: OnceLock<Rules> = OnceLock::new();
+static ANALYSIS_RULE_FILTERS: OnceLock<Vec<RuleFilter>> = OnceLock::new();
+
+// have to use thread local because AnalyzerOptions contains a Box<dyn Any>, which isn't thread-safe
+thread_local! {
+    static ANALYSIS_OPTIONS: AnalyzerOptions = AnalyzerOptions::default();
+}
 
 struct DiagnosticDescriptionExtractor<'a, D> {
     diagnostic: &'a D,
@@ -58,43 +63,36 @@ where
 pub fn fuzz_js_formatter_with_source_type(data: &[u8], source: JsFileSource) -> Corpus {
     let Ok(code1) = std::str::from_utf8(data) else { return Corpus::Reject; };
 
-    // TODO: replace with OnceLock when upgrading to 1.70
-    let rule_filters = if let Some(rules) = unsafe { ANALYSIS_RULE_FILTERS.as_ref() } {
-        rules
-    } else {
-        let rules = unsafe {
-            ANALYSIS_RULES.get_or_insert_with(|| Rules {
-                all: Some(true),
-                ..Default::default()
-            })
-        };
-        let rules = rules.as_enabled_rules().into_iter().collect::<Vec<_>>();
-        unsafe {
-            ANALYSIS_RULE_FILTERS = Some(rules);
-            ANALYSIS_RULE_FILTERS.as_ref().unwrap_unchecked()
-        }
-    };
-    let options = unsafe { ANALYSIS_OPTIONS.get_or_insert_with(AnalyzerOptions::default) };
+    let rules = ANALYSIS_RULES.get_or_init(|| Rules {
+        all: Some(true),
+        ..Default::default()
+    });
+    let rule_filters = ANALYSIS_RULE_FILTERS
+        .get_or_init(|| rules.as_enabled_rules().into_iter().collect::<Vec<_>>());
 
     let parse1 = parse(code1, source);
     if !parse1.has_errors() {
         let language = JsFormatLanguage::new(JsFormatOptions::new(source));
         let tree1 = parse1.tree();
         let mut linter_errors = Vec::new();
-        let _ = analyze(
-            &tree1,
-            AnalysisFilter::from_enabled_rules(Some(rule_filters)),
-            options,
-            source,
-            |e| -> ControlFlow<()> {
-                if let Some(diagnostic) = e.diagnostic() {
-                    linter_errors
-                        .push(DiagnosticDescriptionExtractor::new(&diagnostic).to_string());
-                }
+        let _ = ANALYSIS_OPTIONS
+            .try_with(|options| {
+                analyze(
+                    &tree1,
+                    AnalysisFilter::from_enabled_rules(Some(rule_filters)),
+                    options,
+                    source,
+                    |e| -> ControlFlow<()> {
+                        if let Some(diagnostic) = e.diagnostic() {
+                            linter_errors
+                                .push(DiagnosticDescriptionExtractor::new(&diagnostic).to_string());
+                        }
 
-                ControlFlow::Continue(())
-            },
-        );
+                        ControlFlow::Continue(())
+                    },
+                )
+            })
+            .unwrap();
         let syntax1 = parse1.syntax();
         if let Ok(formatted1) = format_node(&syntax1, language.clone()) {
             if let Ok(printed1) = formatted1.print() {
@@ -108,25 +106,32 @@ pub fn fuzz_js_formatter_with_source_type(data: &[u8], source: JsFileSource) ->
                         .header("original code", "formatted")
                 );
                 let tree2 = parse2.tree();
-                let (maybe_diagnostic, _) = analyze(
-                    &tree2,
-                    AnalysisFilter::from_enabled_rules(Some(rule_filters)),
-                    options,
-                    source,
-                    |e| {
-                        if let Some(diagnostic) = e.diagnostic() {
-                            let new_error =
-                                DiagnosticDescriptionExtractor::new(&diagnostic).to_string();
-                            if let Some(idx) = linter_errors.iter().position(|e| *e == new_error) {
-                                linter_errors.remove(idx);
-                            } else {
-                                return ControlFlow::Break(new_error);
-                            }
-                        }
-
-                        ControlFlow::Continue(())
-                    },
-                );
+                let (maybe_diagnostic, _) = ANALYSIS_OPTIONS
+                    .try_with(|options| {
+                        analyze(
+                            &tree2,
+                            AnalysisFilter::from_enabled_rules(Some(rule_filters)),
+                            options,
+                            source,
+                            |e| {
+                                if let Some(diagnostic) = e.diagnostic() {
+                                    let new_error =
+                                        DiagnosticDescriptionExtractor::new(&diagnostic)
+                                            .to_string();
+                                    if let Some(idx) =
+                                        linter_errors.iter().position(|e| *e == new_error)
+                                    {
+                                        linter_errors.remove(idx);
+                                    } else {
+                                        return ControlFlow::Break(new_error);
+                                    }
+                                }
+
+                                ControlFlow::Continue(())
+                            },
+                        )
+                    })
+                    .unwrap();
                 if let Some(diagnostic) = maybe_diagnostic {
                     panic!(
                         "formatter introduced linter failure: {} (expected one of: {})\n{}",