diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c186f0..7993bf3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # SpamAssassin Milter changelog
 
+## 0.2.0 (unreleased)
+
+*   Invoke `spamc` using the absolute path `/usr/bin/spamc`. To customise this,
+    set the environment variable `SPAMASSASSIN_MILTER_SPAMC` to the desired path
+    when building the application.
+*   The minimum supported Rust version is now 1.46.0.
+
 ## 0.1.6 (2021-05-17)
 
 *   Improve processing of incoming `X-Spam-Flag` headers. Previously, in rare
diff --git a/Cargo.toml b/Cargo.toml
index 1200ba7..8267918 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,6 @@ name = "spamassassin-milter"
 version = "0.1.6"  # remember to update html_root_url and VERSION
 edition = "2018"
 description = "Milter for spam filtering with SpamAssassin"
-authors = ["David Bürgin <dbuergin@gluet.ch>"]
 license = "GPL-3.0-or-later"
 categories = ["email"]
 keywords = ["email", "milter", "spam", "spamassassin"]
diff --git a/README.md b/README.md
index b060c72..576cf78 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,7 @@ recently, `miltertest` had a serious bug that prevents most integration tests in
 this package from completing; make sure you use an up-to-date version of
 `miltertest`.)
 
-The minimum supported Rust version is 1.42.0.
+The minimum supported Rust version is 1.46.0.
 
 [Rust]: https://www.rust-lang.org
 
diff --git a/src/client.rs b/src/client.rs
index a143af4..ea16a71 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -26,7 +26,10 @@ pub struct Spamc {
 }
 
 impl Spamc {
-    const SPAMC_PROGRAM: &'static str = "spamc";
+    const SPAMC_PROGRAM: &'static str = match option_env!("SPAMASSASSIN_MILTER_SPAMC") {
+        Some(p) => p,
+        None => "/usr/bin/spamc",
+    };
 
     pub fn new(spamc_args: &'static [String]) -> Self {
         Self {