diff --git a/Cargo.toml b/Cargo.toml
index bb1c242fb..4e87c292c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,7 +30,7 @@ name = "visudo"
 path = "bin/visudo.rs"
 
 [dependencies]
-libc = "0.2.152"
+libc = "0.2.176"
 glob = "0.3.0"
 
 [features]
diff --git a/src/exec/noexec.rs b/src/exec/noexec.rs
index 0914b185f..309b3f967 100644
--- a/src/exec/noexec.rs
+++ b/src/exec/noexec.rs
@@ -40,15 +40,11 @@ const AUDIT_ARCH_MIPSEL64: u32 = libc::EM_MIPS as u32 | __AUDIT_ARCH_64BIT | __A
 const AUDIT_ARCH_PPC: u32 = libc::EM_PPC as u32;
 const AUDIT_ARCH_PPC64: u32 = libc::EM_PPC64 as u32 | __AUDIT_ARCH_64BIT;
 const AUDIT_ARCH_PPC64LE: u32 = libc::EM_PPC64 as u32 | __AUDIT_ARCH_64BIT | __AUDIT_ARCH_LE;
-const AUDIT_ARCH_RISCV32: u32 = EM_RISCV as u32 | __AUDIT_ARCH_LE;
-const AUDIT_ARCH_RISCV64: u32 = EM_RISCV as u32 | __AUDIT_ARCH_64BIT | __AUDIT_ARCH_LE;
+const AUDIT_ARCH_RISCV32: u32 = libc::EM_RISCV as u32 | __AUDIT_ARCH_LE;
+const AUDIT_ARCH_RISCV64: u32 = libc::EM_RISCV as u32 | __AUDIT_ARCH_64BIT | __AUDIT_ARCH_LE;
 const AUDIT_ARCH_S390X: u32 = libc::EM_S390 as u32 | __AUDIT_ARCH_64BIT;
 const AUDIT_ARCH_X86_64: u32 = libc::EM_X86_64 as u32 | __AUDIT_ARCH_64BIT | __AUDIT_ARCH_LE;
 
-// workaround: libc doesn't have EM_RISCV yet, so we define it ourselves
-// see: https://github.com/rust-lang/libc/issues/4603
-const EM_RISCV: u16 = 243;
-
 /// # Safety
 ///
 /// You must follow the rules the Linux man page specifies for the chosen