diff --git a/Cargo.lock b/Cargo.lock
index 9c13819..5328bae 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -98,23 +98,22 @@ dependencies = [
 
 [[package]]
 name = "bindgen"
-version = "0.49.2"
+version = "0.47.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cexpr 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "clang-sys 0.28.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clang-sys 0.26.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hashbrown 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "peeking_take_while 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "shlex 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "which 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -209,10 +208,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "clang-sys"
-version = "0.28.1"
+version = "0.26.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "glob 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "libloading 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -353,7 +352,7 @@ dependencies = [
  "num_cpus 1.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "page_size 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "prometheus 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rocksdb 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rocksdb 0.12.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -440,24 +439,30 @@ name = "fuchsia-cprng"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "fxhash"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "gcc"
 version = "0.3.55"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "glob"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "glob"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "hashbrown"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.5.0"
@@ -521,12 +526,12 @@ dependencies = [
 
 [[package]]
 name = "librocksdb-sys"
-version = "6.2.4"
+version = "5.18.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bindgen 0.49.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bindgen 0.47.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "cc 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "glob 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -872,11 +877,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "rocksdb"
-version = "0.13.0"
+version = "0.12.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
- "librocksdb-sys 6.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "librocksdb-sys 5.18.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -929,6 +934,11 @@ name = "ryu"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "scopeguard"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "scopeguard"
 version = "1.0.0"
@@ -981,11 +991,6 @@ dependencies = [
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "shlex"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "signal-hook"
 version = "0.1.10"
@@ -1270,7 +1275,7 @@ dependencies = [
 "checksum base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0b25d992356d2eb0ed82172f5248873db5560c4721f564b13cb5193bda5e668e"
 "checksum bech32 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9e0089c35ab7c6f2bc55ab23f769913f0ac65b1023e7e74638a1f43128dd5df2"
 "checksum bincode 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b8ab639324e3ee8774d296864fbc0dbbb256cf1a41c490b94cba90c082915f92"
-"checksum bindgen 0.49.2 (registry+https://github.com/rust-lang/crates.io-index)" = "846a1fba6535362a01487ef6b10f0275faa12e5c5d835c5c1c627aabc46ccbd6"
+"checksum bindgen 0.47.3 (registry+https://github.com/rust-lang/crates.io-index)" = "df683a55b54b41d5ea8ebfaebb5aa7e6b84e3f3006a78f010dadc9ca88469260"
 "checksum bitcoin 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)" = "dc34f963060a2091b4e285d8082e1946be35caf467e73b3155262c8357fb4595"
 "checksum bitcoin_hashes 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "db6b697833d852acea530c9e815e6adc724267856b6506bc500362a068a39c7b"
 "checksum bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
@@ -1282,7 +1287,7 @@ dependencies = [
 "checksum cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 "checksum chrono 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)" = "e8493056968583b0193c1bb04d6f7684586f3726992d6c573261941a895dbd68"
 "checksum chunked_transfer 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "498d20a7aaf62625b9bf26e637cf7736417cde1d0c99f1d04d1170229a85cf87"
-"checksum clang-sys 0.28.1 (registry+https://github.com/rust-lang/crates.io-index)" = "81de550971c976f176130da4b2978d3b524eaa0fd9ac31f3ceb5ae1231fb4853"
+"checksum clang-sys 0.26.4 (registry+https://github.com/rust-lang/crates.io-index)" = "6ef0c1bcf2e99c649104bd7a7012d8f8802684400e03db0ec0af48583c6fa0e4"
 "checksum clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5067f5bb2d80ef5d68b4c87db81601f0b75bca627bc2ef76b141d7b846a3c6d9"
 "checksum cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
 "checksum configure_me 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "478e5d56a6bff5d410d9d5871cf6e43546a3b14447ffc64286bc97892d5d3b84"
@@ -1304,9 +1309,10 @@ dependencies = [
 "checksum fmt2io 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c9db8691f0820ad11ce6eb94057d0dd9c456500da04da0c12a85c90d6f979cc9"
 "checksum fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "2fad85553e09a6f881f739c29f0b00b0f01357c743266d478b68951ce23285f3"
 "checksum fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
-"checksum fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c31b6d751ae2c7f11320402d34e41349dd1016f8d5d45e48c4312bc8625af50c"
 "checksum gcc 0.3.55 (registry+https://github.com/rust-lang/crates.io-index)" = "8f5f3913fa0bfe7ee1fd8248b6b9f42a5af4b9d65ec2dd2c3c26132b950ecfc2"
+"checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
 "checksum glob 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9b919933a397b79c37e33b77bb2aa3dc8eb6e165ad809e58ff75bc7db2e34574"
+"checksum hashbrown 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "3bae29b6653b3412c2e71e9d486db9f9df5d701941d86683005efb9f2d28e3da"
 "checksum hashbrown 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e1de41fb8dba9714efd92241565cdff73f78508c95697dd56787d3cba27e2353"
 "checksum hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "805026a5d0141ffc30abb3be3173848ad46a1b1664fe632428479619a3644d77"
 "checksum humantime 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "df004cfca50ef23c36850aaaa59ad52cc70d0e90243c3c7737a4dd32dc7a3c4f"
@@ -1316,7 +1322,7 @@ dependencies = [
 "checksum lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 "checksum libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)" = "1a31a0627fdf1f6a39ec0dd577e101440b7db22672c0901fe00a9a6fbb5c24e8"
 "checksum libloading 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f2b111a074963af1d37a139918ac6d49ad1d0d5e47f72fd55388619691a7d753"
-"checksum librocksdb-sys 6.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "0a0785e816e1e11e7599388a492c61ef80ddc2afc91e313e61662cce537809be"
+"checksum librocksdb-sys 5.18.3 (registry+https://github.com/rust-lang/crates.io-index)" = "d19778314deaa7048f2ea7d07b8aa12e1c227acebe975a37eeab6d2f8c74e41b"
 "checksum log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "14b6052be84e6b71ab17edffc2eeabf5c2c3ae1fdb464aae35ac50c67a44e1f7"
 "checksum lru 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)" = "5d8f669d42c72d18514dfca8115689c5f6370a17d980cb5bd777a67f404594c8"
 "checksum man 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "ccbbb1d623a3cbcaeef9a072f7ccbd6f8ca1e788f3e301d5c49bdd67b1f5a942"
@@ -1358,7 +1364,7 @@ dependencies = [
 "checksum redox_users 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4ecedbca3bf205f8d8f5c2b44d83cd0690e39ee84b951ed649e9f1841132b66d"
 "checksum regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dc220bd33bdce8f093101afe22a037b8eb0e5af33592e6a9caafff0d4cb81cbd"
 "checksum regex-syntax 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)" = "11a7e20d1cce64ef2fed88b66d347f88bd9babb82845b2b858f3edbf59a4f716"
-"checksum rocksdb 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)" = "12069b106981c6103d3eab7dd1c86751482d0779a520b7c14954c8b586c1e643"
+"checksum rocksdb 0.12.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d29e12aab379a49bfbca337132440be73d1de6f328d5635641c2b28ac9dfe514"
 "checksum roff 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e33e4fb37ba46888052c763e4ec2acfedd8f00f62897b630cadb6298b833675e"
 "checksum rust-argon2 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4ca4eaef519b494d1f2848fc602d18816fed808a981aedf4f1f00ceb7c9d32cf"
 "checksum rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)" = "f76d05d3993fd5f4af9434e8e436db163a12a9d40e1a58a726f27a01dfd12a2a"
@@ -1366,6 +1372,7 @@ dependencies = [
 "checksum rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)" = "dcf128d1287d2ea9d80910b5f1120d0b8eede3fbf1abe91c40d39ea7d51e6fda"
 "checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
 "checksum ryu 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "bfa8506c1de11c9c4e4c38863ccbe02a305c8188e85a05a784c9e11e1c3910c8"
+"checksum scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "94258f53601af11e6a49f722422f6e3425c52b06245a5cf9bc09908b174f5e27"
 "checksum scopeguard 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b42e15e59b18a828bbf5c58ea01debb36b9b096346de35d941dcb89009f24a0d"
 "checksum secp256k1 0.15.5 (registry+https://github.com/rust-lang/crates.io-index)" = "4d311229f403d64002e9eed9964dfa5a0a0c1ac443344f7546bf48e916c6053a"
 "checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
@@ -1373,7 +1380,6 @@ dependencies = [
 "checksum serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)" = "9796c9b7ba2ffe7a9ce53c2287dfc48080f4b2b362fcc245a259b3a7201119dd"
 "checksum serde_derive 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)" = "4b133a43a1ecd55d4086bd5b4dc6c1751c68b1bfbeba7a5040442022c7e7c02e"
 "checksum serde_json 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)" = "2f72eb2a68a7dc3f9a691bfda9305a1c017a6215e5a4545c258500d2099a37c2"
-"checksum shlex 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7fdf1b9db47230893d76faad238fd6097fd6d6a9245cd7a4d90dbd639536bbd2"
 "checksum signal-hook 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "4f61c4d59f3aaa9f61bba6450a9b80ba48362fd7d651689e7a10c453b1f6dc68"
 "checksum signal-hook-registry 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1797d48f38f91643908bb14e35e79928f9f4b3cefb2420a564dde0991b4358dc"
 "checksum smallvec 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)" = "ab606a9c5e214920bb66c458cd7be8ef094f813f20fe77a54cc7dbfff220d4b7"
diff --git a/Cargo.toml b/Cargo.toml
index 57713b2..4a19f59 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -38,7 +38,7 @@ lru = "0.1"
 num_cpus = "1.0"
 page_size = "0.4"
 prometheus = "0.5"
-rocksdb = "0.13"
+rocksdb = "= 0.12.2"	# due to https://github.com/romanz/electrs/issues/193
 rust-crypto = "0.2"
 serde = "1.0"
 serde_derive = "1.0"