diff --git a/.gitignore b/.gitignore
index b90a349..62a2c7b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@
 /libdeflate-sys-1.19.0.crate
 /libdeflate-sys-1.19.2.crate
 /libdeflate-sys-1.19.3.crate
+/libdeflate-sys-1.20.0.crate
diff --git a/libdeflate-sys-1.19.3-unconditional-pkg-config.patch b/libdeflate-sys-1.19.3-unconditional-pkg-config.patch
deleted file mode 100644
index 1a17160..0000000
--- a/libdeflate-sys-1.19.3-unconditional-pkg-config.patch
+++ /dev/null
@@ -1,15 +0,0 @@
-diff -Naur libdeflate-sys-1.19.3-original/build.rs libdeflate-sys-1.19.3/build.rs
---- libdeflate-sys-1.19.3-original/build.rs	2006-07-23 21:21:28.000000000 -0400
-+++ libdeflate-sys-1.19.3/build.rs	2024-02-28 11:39:40.715923702 -0500
-@@ -5,11 +5,9 @@
- fn main() {
-     let dst = PathBuf::from(env::var_os("OUT_DIR").unwrap());
- 
--    #[cfg(feature = "dynamic")]
-     if pkg_config::Config::new()
-         .print_system_libs(false)
-         .cargo_metadata(true)
--        .exactly_version("1.19")
-         .probe("libdeflate")
-         .is_ok()
-     {
diff --git a/libdeflate-sys-fix-metadata.diff b/libdeflate-sys-fix-metadata.diff
index 70135e2..35289fb 100644
--- a/libdeflate-sys-fix-metadata.diff
+++ b/libdeflate-sys-fix-metadata.diff
@@ -1,5 +1,5 @@
---- libdeflate-sys-1.19.3/Cargo.toml	1970-01-01T00:00:01+00:00
-+++ libdeflate-sys-1.19.3/Cargo.toml	2024-03-10T21:27:12.731439+00:00
+--- libdeflate-sys-1.20.0/Cargo.toml	1970-01-01T00:00:01+00:00
++++ libdeflate-sys-1.20.0/Cargo.toml	2024-04-04T15:09:43.726586+00:00
 @@ -40,8 +40,7 @@
  
  [build-dependencies.pkg-config]
diff --git a/rust-libdeflate-sys.spec b/rust-libdeflate-sys.spec
index ad09ec5..378846a 100644
--- a/rust-libdeflate-sys.spec
+++ b/rust-libdeflate-sys.spec
@@ -5,7 +5,7 @@
 %global crate libdeflate-sys
 
 Name:           rust-libdeflate-sys
-Version:        1.19.3
+Version:        1.20.0
 Release:        %autorelease
 Summary:        Bindings to libdeflate for DEFLATE
 
@@ -17,13 +17,6 @@ Source:         %{crates_source}
 #   it with the “dynamic” feature, since we patch the crate to always link
 #   dynamically with the system libdeflate, regardless of the selected features.
 Patch:          libdeflate-sys-fix-metadata.diff
-# # * Downstream-only: always link dynamically with the system libdeflate,
-# #   regardless of the selected features, and do not pin an exact version of
-# #   libdeflate. Together with libdeflate-sys-fix-metadata.diff, this effectively
-# #   reverts:
-# # * Dynamic Linking Constraints
-# # * https://github.com/adamkewley/libdeflater/pull/32
-Patch10:       libdeflate-sys-1.19.3-unconditional-pkg-config.patch
 
 BuildRequires:  cargo-rpm-macros >= 24
 
@@ -89,6 +82,17 @@ use the "freestanding" feature of the "%{crate}" crate.
 %autosetup -n %{crate}-%{version} -p1
 # Remove the bundled copy of libdeflate.
 rm -rv libdeflate
+# Make libdeflate detection with pkg-config unconditional.
+sed -r -i 's@^([[:blank:]]*)(#\[cfg\(feature *= *"dynamic"\)\])@\1// \2@' build.rs
+# Don’t require an exact version match. We would *like* the versions to stay
+# aligned, but we don’t *need* to update libdeflate and
+# rust-libdeflate-sys/rust-libdeflater concurrently.
+sed -r -i 's@^([[:blank:]]*)(\.exactly_version\()@\1// \2@' build.rs
+# The above two sed-patches effectively revert “Dynamic Linking Constraints”,
+# https://github.com/adamkewley/libdeflater/pull/32. Using sed instead of a
+# patch file keeps us from having to update the patch every time the version
+# number changes.
+
 %cargo_prep
 
 %generate_buildrequires
diff --git a/rust2rpm.toml b/rust2rpm.toml
index 87ab577..5c6f6e5 100644
--- a/rust2rpm.toml
+++ b/rust2rpm.toml
@@ -8,20 +8,23 @@ lib = [
 
 [package]
 cargo-toml-patch-comments = [
-    "Make the dependency on crate(pkg-config) non-optional instead of associating it with the “dynamic” feature, since we patch the crate to always link dynamically with the system libdeflate, regardless of the selected features.",
-]
-
-[[package.extra-patches]]
-number = 10
-file = "libdeflate-sys-1.19.3-unconditional-pkg-config.patch"
-comments = [
-    "Downstream-only: always link dynamically with the system libdeflate, regardless of the selected features, and do not pin an exact version of libdeflate. Together with libdeflate-sys-fix-metadata.diff, this effectively reverts:",
-    "Dynamic Linking Constraints",
-    "https://github.com/adamkewley/libdeflater/pull/32"
+  "Make the dependency on crate(pkg-config) non-optional instead of associating it with the “dynamic” feature, since we patch the crate to always link dynamically with the system libdeflate, regardless of the selected features.",
 ]
 
 [scripts.prep]
 pre = [
-    "# Remove the bundled copy of libdeflate.",
-    "rm -rv libdeflate",
+  '''
+# Remove the bundled copy of libdeflate.
+rm -rv libdeflate
+# Make libdeflate detection with pkg-config unconditional.
+sed -r -i 's@^([[:blank:]]*)(#\[cfg\(feature *= *"dynamic"\)\])@\1// \2@' build.rs
+# Don’t require an exact version match. We would *like* the versions to stay
+# aligned, but we don’t *need* to update libdeflate and
+# rust-libdeflate-sys/rust-libdeflater concurrently.
+sed -r -i 's@^([[:blank:]]*)(\.exactly_version\()@\1// \2@' build.rs
+# The above two sed-patches effectively revert “Dynamic Linking Constraints”,
+# https://github.com/adamkewley/libdeflater/pull/32. Using sed instead of a
+# patch file keeps us from having to update the patch every time the version
+# number changes.
+'''
 ]
diff --git a/sources b/sources
index f4122f0..489b5ab 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (libdeflate-sys-1.19.3.crate) = c1b708672f6ce85579e5dda2537fe6804e73d92053a08387b2ec09388f0697fa3230298931116f482ae4242a0bf7afda9d8f309a13222ef5dee94f56a009890e
+SHA512 (libdeflate-sys-1.20.0.crate) = b56d38ae5eba51627b78260454d4b9b58a000e765f6516ee59159496a2041f543ad973b19bbb3e8db7afc0d41940783fc28ec2efd769aa37cde7ab93715f6403